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Posts Tagged ‘OGQ’

GQW articles: May 2012 edition

This post includes 33 articles divided by category as follows:

  • GQ-Biology (GQB).  8 articles
  • GQ-Cations (GQC). 1 article
  • GQ-Methods (GQM). 5 articles
  • GQ-Nano & Technology (GQNT). 9 articles
  • GQ-Recognition (GQR). 5 articles
  • GQ-Structure & Dynamics (GQSD). 2 articles
  • GQ-Supramolecular (GQS). 3 articles
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• GQ-Biology. Studies aimed at the discovery of GQs in living organisms and the elucidation of their role in biological processes. (putative quadruplex sequences in genomes; proteins that recognize GQs; in vitro and in vivo studies of GQs) [8 articles]

  1. DNA helicase and helicase–nuclease enzymes with a conserved iron–sulfur cluster. [OA] Yuliang Wu and Robert M. Brosh, Jr. Nucleic Acids Res. 2012; 40:4247-4260.
  2. The RNA helicase RHAU (DHX36) unwinds a G4-quadruplex in human telomerase RNA and promotes the formation of the P1 helix template boundary. [OA] E. P. Booy, M. Meier, N. Okun, S. K. Novakowski, S. Xiong, J. Stetefeld, and S. A. McKenna. Nucleic Acids Res. 2012; 40:4110-4124.
  3. Quadruplex-single nucleotide polymorphisms (Quad-SNP) influence gene expression difference among individuals. [OA] Aradhita Baral, Pankaj Kumar, Rashi Halder, Prithvi Mani, Vinod Kumar Yadav, Ankita Singh, Swapan K. Das, and Shantanu Chowdhury. Nucleic Acids Res. 2012; 40: 3800-3811.
  4. Autophagy acts as a safeguard mechanism against G-quadruplex ligand-mediated DNA damage. [OA] NI Orlotti, G Cimino-Reale, E Borghini, M Pennati, C Sissi, F Perrone, M Palumbo, MG Daidone, M Folini, and N Zaffaroni. Autophagy. 8 (8) 2012 [Epub Aug 1] PMID: 22627293
  5. RTEL1 Dismantles T Loops and Counteracts Telomeric G4-DNA to Maintain Telomere Integrity. JB Vannier, V Pavicic-Kaltenbrunner, MI Petalcorin, H Ding, and SJ Boulton. Cell. 2012; 149 (4): 795-806. PMID: 22579284
  6. Promoter G-quadruplex sequences are targets for base oxidation and strand cleavage during hypoxia-induced transcription. DW Clark, T Phang, MG Edwards, MW Geraci, & MN Gillespie. Free Radic Biol Med. 2012. [Epub May 1] PMID: 22583700
  7. The human RecQ helicases BLM and RECQL4 cooperate to preserve genome stability. [OA] D Kumar Singh, V Popuri, T Kulikowicz, I Shevelev, AK Ghosh, M Ramamoorthy, ML Rossi, P Janscak, DL Croteau, and VA Bohr. Nucleic Acids Res. 2012.
  8. The BLM helicase contributes to telomere maintenance through processing of late-replicating intermediate structures. [OA] Colleen Barefield and Jan Karlseder. Nucleic Acids Res. 2012. [Epub May 10] DOI: 10.1093/nar/gks407
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• GQ-Cations. Studies aimed at elucidating the role of cations in GQ structure and/or dynamics. [1 article]
  1. Stable G-quadruplex structure in a hydrated ion pair: cholinium cation and dihydrogen phosphate anion. K Fujita and H Ohno. Chem. Commun. 2012; 48 (46): 5751-5753.  PMID: 22552502
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• GQ-Methods. Application and development of methods and techniques to study GQs. [5 articles]

  1. NMR spectroscopy of G-quadruplexes. M Adrian, B Heddi, and AT Phan. Methods. 2012 [Epub May 24] PMID: 22633887
  2. Sequence-specific detection of nucleic acids utilizing isothermal enrichment of G-quadruplex DNAzymes. HJ Xiao, HC Hak, DM Kong, and HX Shen. Anal Chim Acta. 729: 67-72. 2012 [Epub Apr 21] PMID: 22595435
  3. QGRS-H Predictor: a web server for predicting homologous quadruplex forming G-rich sequence motifs in nucleotide sequences. Menendez C, Frees S, Bagga PS. Nucleic Acids Res. 2012 May 10. [Epub ahead of print] PMID: 22576365
  4. UV Spectroscopy of DNA Duplex and Quadruplex Structures in the Gas Phase. Rosu F, Gabelica V, De Pauw E, Antoine R, Broyer M, Dugourd P. J Phys Chem A. 2012 May 8. [Epub ahead of print] PMID: 22568521
  5. Computational Detection and Analysis of Sequences with Duplex-Derived Interstrand G-quadruplex Forming Potential. Cao K, Ryvkin P, Brad Johnson F. Methods. 2012  [Epub May 28] PMID: 22652626
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• GQ-Nano & Technology. The design and development of GQ-based nanostructures. The use of GQs as components in devices (e.g., sensors). [9 articles]

  1. Aptamer-DNAzyme hairpins for biosensing of Ochratoxin A. Yang C, Lates V, Prieto-Simón B, Marty JL, Yang X. Biosens Bioelectron. 2012 Feb 15; 32 (1): 208-212. [Epub 2011 Dec 13] PMID: 22221796
  2. Sensitive fluorescence biosensor for folate receptor based on terminal protection of small-molecule-linked DNA. X Wei, W Lin, N Ma, F Luo, Z Lin, L Guo, B Qiu, & G Chen.  Chem. Commun. 2012; 48 (49): 6184-6186. [Epub May 16] PMID: 22590712
  3. Structure Formation and Catalytic Activity of DNA Dissolved in Organic Solvents. H Abe, N Abe, A Shibata, K Ito, Y Tanaka, M Ito, H Saneyoshi, S Shuto, and Y Ito. Angew Chem Int Ed Engl. 2012 [Epub May 22] DOI: 10.1002/anie.201201111. PMID: 22615181
  4. Photosensitizer-incorporated G-quadruplex DNA-functionalized magnetofluorescent nanoparticles for targeted magnetic resonance/fluorescence multimodal imaging and subsequent photodynamic therapy of cancer. M Yin, Z Li, Z Liu, J Ren, X Yang, and X Qu. Chem. Commun. 2012 [Epub May 24] PMID: 22622597
  5. Detection of quadruplex DNA by gold nanoparticles. HF Crouse, A Doudt, C Zerbe, and S Basu. J Anal Methods Chem. 2012; 2012: 327603.
  6. Fluorescence Detection of DNA, Adenosine-5′-Triphosphate (ATP) and Telomerase Activity by Zn(II)-Protoporphyrin IX/G-Quadruplex Labels. Z Zhang, E Sharon, R Freeman, X Liu, and I Willner. Anal Chem. 2012.
  7. Ultrasensitive detection of potassium ions based on target induced DNA conformational switch enhanced fluorescence polarization. Hu K, Huang Y, Zhao S, Tian J, Wu Q, Zhang G, Jiang J. Analyst. 2012  [Epub May 3] PMID: 22551947
  8. Single-molecule analysis using DNA origami. Rajendran A, Endo M, Sugiyama H. Angew Chem Int Ed Engl. 2012 Jan 23;51(4):874-90. doi: 10.1002/anie.201102113. Epub 2011 Nov 25. Review. PMID: 22121063
  9. Enantioselective Friedel-Crafts reactions in water catalyzed by a human telomeric G-quadruplex DNA metalloenzyme. C Wang, Y Li, G Jia, Y Liu, S Lu, and C Li. Chem. Commun. 2012 [Epub May 18] PMID: 22595813
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• GQ-Recognition. Discovery and development of (mostly) small molecule ligands that recognize GQs (synthesis; design; pharmacology; medicinal chemistry). [5 articles]

  1. Phthalocyanines: a new class of G-quadruplex-ligands with many potential applications. Yaku H, Fujimoto T, Murashima T, Miyoshi D, Sugimoto N. Chem. Commun. 2012 [Epub May 15] PMID: 22590705
  2. The porphyrin TmPyP4 unfolds the extremely stable G-quadruplex in MT3-MMP mRNA and alleviates its repressive effect to enhance translation in eukaryotic cells. [OA] Mark J. Morris, Katherine L. Wingate, Jagannath Silwal, Thomas C. Leeper, and Soumitra Basu. Nucleic Acids Res. 2012; 40:4137-4145.
  3. A New Cationic Porphyrin Derivative (TMPipEOPP) with Large Side Arm Substituents: A Highly Selective G-Quadruplex Optical Probe. [OA] LN Zhu, SJ Zhao, B Wu, XZ Li, and DM Kong. PLoS One. 2012; 7 (5): e35586 [Epub May 22] PMID: 22629300
  4. Interaction of Berberine derivative with protein POT1 affect telomere function in cancer cells. Xiao N, Chen S, Ma Y, Qiu J, Tan JH, Ou TM, Gu LQ, Huang ZS, Li D. Biochem Biophys Res Commun. 2012 Mar 16; 419 (3): 567-572. Epub 2012 Feb 17. PMID: 22369941
  5. Interaction of Pyrrolobenzodiazepine (PBD) Ligands with Parallel Intermolecular G-Quadruplex Complex Using Spectroscopy and ESI-MS [OA] Raju G, Srinivas R, Santhosh Reddy V, Idris MM, Kamal A, Nagesh N. PLoS One. 2012; 7 (4): e35920. Epub 2012 Apr 27. PMID: 22558271
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• GQ-Structure & Dynamics. Studies aimed at elucidating structure and/or dynamics GQ. This includes experimental techniques such as X-Ray crystallography, NMR, and other spectroscopic methods as well as theoretical approaches such as MD-simulations. [2 articles]

  1. Crystal structure of a c-kit promoter quadruplex reveals the structural role of metal ions and water molecules in maintaining loop conformation. [OA] Dengguo Wei, Gary N. Parkinson, Anthony P. Reszka, and Stephen Neidle. Nucleic Acids Res. 2012; 40: 4691-4700.
  2. Energetic basis of human telomeric DNA folding into G-quadruplex structures. M Boncina, J Lah, I Prislan, & G Vesnaver. J Am Chem Soc. 2012. [Epub May 17] PMID: 22594380
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• GQ-Supramolecular. Studies related to the design and applications of GQs in supramolecular chemistry. (assemblies; molecular devices) [3 articles]

  1. Crystal Structure of a Template-Assembled Synthetic G-Quadruplex. M Nikan, BO Patrick, and JC Sherman. Chembiochem. 2012. [Epub May 24] DOI: 10.1002/cbic.201200262. PMID: 22628361
  2. Effect of precursor chain-length on the formation and stability of poly(ethylene glycol)-based supramolecular star polymers. Ikhlas Gadwal, Swati De, Mihaiela C. Stuparu, Se Gyu Jang, Roey J. Amir, Anzar Khan. Journal of Polymer Science Part A: Polymer Chemistry. 2012, 50, 2415–2420. DOI: 10.1002/pola.26018
  3. Porphyrin-templated synthetic G-quartet (PorphySQ): a second prototype of G-quartet–based G-quadruplex ligand. Xu, H.-J.; Stefan, L.; Haudecoeur, R.; Vuong, S.; Richard, P.; Denat, F.; Barbe, J.-M.; Gros, C. P.; Monchaud, D. Org. Biomol. Chem. 2012. ASAP DOI: 10.1039/C2OB25601K
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[OA] = Open Access
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GQW articles: March 2012 edition


From this post onwards, I intend to classify the monthly references by subtopics. Having the references curated this way makes the initial process a little more time consuming, but, I’m hoping it will pay out in the end by providing a quick reference source in the future.

The initial subtopics, with a basic description and some keywords/tags, are:

  • GQ-Biology. Studies aimed at the discovery of GQs in living organisms and the elucidation of their role in biological processes. (putative quadruplex sequences in genomes; proteins that recognize GQs; in vitro and in vivo studies of GQs)
  • GQ-Cations. Studies aimed at elucidating the role of cations in GQ structure and/or dynamics.
  • GQ-Methods. Application and development of methods and techniques to study GQs.
  • GQ-Nano & Technology. The design and development of GQ-based nanostructures. The use of GQs as components in devices (e.g., sensors; molecular machinery).
  • GQ-Recognition. Discovery and development of (mostly) small molecule ligands that recognize GQs (synthesis; design; pharmacology; medicinal chemistry).
  • GQ-Structure & Dynamics. Studies aimed at elucidating the detailed structure and/or dynamics of GQs. This includes experimental techniques such as X-Ray crystallography, NMR, and other spectroscopic methods as well as theoretical approaches such as MD-simulations.
  • GQ-Supramolecular. Studies related to the design and applications of GQs in supramolecular chemistry. Of particular interest are studies on the use of independent guanosine subunits to guide the self-assembly of complex structures. (assemblies; molecular devices)

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• GQ-Biology. Studies aimed at the discovery of GQs in living organisms and the elucidation of their role in biological processes. (putative quadruplex sequences in genomes; proteins that recognize GQs; in vitro and in vivo studies of GQs) [13 articles]


  1. The DEAH-box helicase RHAU is an essential gene and critical for mouse hematopoiesis. Lai JC, Ponti S, Pan D, Kohler H, Skoda RC, Matthias P, Nagamine Y. Blood. 2012 Mar 15. [Epub before print] PMID: 22422825
  2. The RNA helicase RHAU (DHX36) unwinds a G4-quadruplex in human telomerase RNA and promotes the formation of the P1 helix template boundary. [OA] E. P. Booy, M. Meier, N. Okun, S. K. Novakowski, S. Xiong, J. Stetefeld, & S. A. McKenna. Nucleic Acids Res. published 11 January 2012, 10.1093/nar/gkr1306
  3. Cell Cycle Regulation of G-Quadruplex DNA Structures at Telomeres. Juranek SA, Paeschke K. Curr Pharm Des.2012 Feb 27. [Epub before print] PMID: 22376109
  4. New insights into replication origin characteristics in metazoans. Cayrou C, Coulombe P, Puy A, Rialle S, Kaplan N, Segal E, Méchali M. Cell Cycle. 2012 Feb 15;11(4):658-67. PMID: 22373526
  5. The formation and stabilization of a novel G-quadruplex in the 5′-flanking region of the relaxin gene [OA] Lin S, Gu H, Xu M, Cui X, Zhang Y, Gao W, Yuan G. PLoS One. 2012;7(2):e31201. Epub 2012 Feb 21. PMID: 22363579
  6. Saccharomyces cerevisiae Mph1 helicase on junction-containing DNA structures [OA] Young-Hoon Kang, Palinda Ruvan Munashingha, Chul-Hwan Lee, Tuan Anh Nguyen, & Yeon-Soo Seo. Nucleic Acids Res. 2012; 40: 2089-2106.
  7. Nonspaced inverted DNA repeats are preferential targets for homology-directed gene repair in mammalian cells. [OA] Maarten Holkers, Antoine A. F. de Vries, and Manuel A. F. V. Gonçalves. Nucleic Acids Res. 2012; 40:1984-1999.
  8. Yin Yang 1 contains G-quadruplex structures in its promoter and 5′-UTR and its expression is modulated by G4 resolvase 1. [OA] Weiwei Huang, Philip J. Smaldino, Qiang Zhang, Lance D. Miller, Paul Cao, Kristin Stadelman, Meimei Wan, Banabihari Giri, Ming Lei, Yoshikuni Nagamine, James P. Vaughn, Steven A. Akman, & Guangchao Sui. Nucleic Acids Res. 2012; 40:1033-1049.
  9. Overcoming natural replication barriers: differential helicase requirements [OA] Ranjith P. Anand, Kartik A. Shah, Hengyao Niu, Patrick Sung, Sergei M. Mirkin, & Catherine H. Freudenreich. Nucleic Acids Res. 2012; 40:1091-1105.
  10. Quadruplex-single nucleotide polymorphisms (Quad-SNP) influence gene expression difference among individuals. [OA] Aradhita Baral, Pankaj Kumar, Rashi Halder, Prithvi Mani, Vinod Kumar Yadav, Ankita Singh, Swapan K. Das, & Shantanu Chowdhury. Nucleic Acids Res. published 11 January 2012, [Epub before print]
  11. Bisquinolinium compounds induce quadruplex-specific transcriptome changes in HeLa S3 cell lines. R Halder, JF Riou, MP Teulade-Fichou, T Frickey, & JS Hartig. BMC Res Notes. 2012; 5: 138.
  12. A telomerase-associated RecQ protein-like helicase resolves telomeric G-quadruplex structures during replication. J Postberg, M Tsytlonok, D Sparvoli, D Rhodes, & HJ Lipps. Gene. 2012. [Epub before print]
  13. DNA replication through hard-to-replicate sites, including both highly transcribed RNA Pol II and Pol III genes, requires the S. pombe Pfh1 helicase. N Sabouri, KR McDonald, CJ Webb, IM Cristea, & VA Zakian. Genes Dev. 2012; 26: 581.
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• GQ-Cations. Studies aimed at elucidating the role of cations in the structure and/or dynamics of GQs. [1 article]

  1. Kinetics and mechanism of G-quadruplex formation and conformational switch in a G-quadruplex of PS2.M induced by Pb2+ . Wei Liu, Hong Zhu, Bin Zheng, Sheng Cheng, Yan Fu, Wei Li, Tai-Chu Lau, and Haojun Liang. Nucleic Acids Res. published 12 January 2012, 10.1093/nar/gkr1310
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• GQ-Methods. Application and development of methods and techniques to study GQs. [11 articles]

  1. Determination of DNA structural detail using radioprobing. Girard PM, Laughton C, Nikjoo H. Int J Radiat Biol. 2012 Jan;88(1-2):123-128. Epub 2011 Sep 21. PMID: 21823822
  2. Tandem mass spectrometry of platinated quadruplex DNA. Stucki SR, Nyakas A, Schürch S. J Mass Spectrom. 2011 Dec;46 (12):1288-1297. doi: 10.1002/jms.2019. PMID: 22223421
  3. Selective isolation of G-quadruplexes by affinity chromatography. Chang T, Liu X, Cheng X, Qi C, Mei H, Shangguan D. J Chromatogr A. 2012 Feb 16. [Epub before print] PMID: 22398385
  4. Reporter assays for studying quadruplex nucleic acids. Halder K, Benzler M, Hartig JS. Methods. 2012 Feb 23. [Epub ahead of print] PMID: 22388183
  5. G-quadruplex structure and stability illuminated by 2-aminopurine phasor plots [OA] Robert Buscaglia, David M. Jameson, & Jonathan B. Chaires. Nucleic Acids Res. published 12 January 2012, 10.1093/nar/gkr1286
  6. Sensitive and label-free biosensing of RNA with predicted secondary structures by a triplex affinity capture method. Laura G. Carrascosa, S. Gómez-Montes, A. Aviñó, A. Nadal, M. Pla, R. Eritja, & L. M. Lechuga. Nucleic Acids Res. published 12 January 2012, 10.1093/nar/gkr1304
  7. A streptavidin paramagnetic-particle based competition assay for the evaluation of the optical selectivity of quadruplex nucleic acid fluorescent probes. E Largy, F Hamon, & MP Teulade-Fichou. Methods. 2012. [Epub before print]
  8. Methods of studying telomere damage induced by quadruplex-ligand complexes. Rizzo A, Salvati E, Biroccio A. Methods. 2012 Mar 4. [Epub before print] PMID: 22410593
  9. Fluorescence properties of 8-(2-pyridyl)guanine “2PyG” as compared to 2-aminopurine in DNA. Dumas A, Luedtke NW. Chembiochem. 2011 Sep 5;12(13):2044-51. doi: 10.1002/cbic.201100214. Epub 2011 Jul 22. PMID: 21786378
  10. Circular dichroism and guanine quadruplexes. M Vorlickova, I Kejnovska, J Sagi, D Renciuk, K Bednarova, J Motlova, & J Kypr. Methods. 2012. [Epub before print]
  11. Combination of chromatographic and chemometric methods to study the interactions between DNA strands. S Ruiz-Castelar, A Checa, R Gargallo, & J Jaumot. Anal Chim Acta. 2012; 722: 34. PMID: 22444532
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• GQ-Nano & Technology.  The design and development of GQ-based nanostructures. The use of GQs as components in devices (e.g., sensors, aptamers). [17 articles]

  1. Hemin/G-quadruplex simultaneously acts as NADH oxidase and HRP-mimicking DNAzyme for simple, sensitive pseudobienzyme electrochemical detection of thrombin. Yuan Y, Yuan R, Chai Y, Zhuo Y, Ye X, Gan X, Bai L. Chem Commun. 2012 Mar 30. [Epub before print] PMID: 22466956
  2. DNAzyme-based turn-on chemiluminescence assays in homogenous media. Zhou M, Liu Y, Tu Y, Tao G, Yan. J. Biosens Bioelectron. 2012 Mar 17. [Epub before print] PMID: 22465444
  3. Label-free Fluorescent Detection of Ions, Proteins and Small Molecules Using Structure-Switching Aptamers, SYBR Gold and Exonuclease Ⅰ. Zheng D, Zou R, Lou X. Anal Chem. 2012 Mar 16. [Epub before print]  PMID: 22424113
  4. The insertion of two 8-methyl-2′-deoxyguanosine residues in tetramolecular quadruplex structures: trying to orientate the strands. [OA] Virgilio A, Esposito V, Citarella G, Pepe A, Mayol L, Galeone A. Nucleic Acids Res. 2012 Jan; 40 (1):461-75. Epub 2011 Sep 9. PMID: 21908403
  5. Elongated Thrombin Binding Aptamer: A G-Quadruplex Cation-Sensitive Conformational Switch. De Rache A, Kejnovská I, Vorlíčková M, Buess-Herman C. Chemistry. 2012 Feb 23. doi: 10.1002/chem.201103381. [Epub ahead of print] PMID: 22362492
  6. Amplified Surface Plasmon Resonance and Electrochemical Detection of Pb2+ Ions Using the Pb2+-Dependent DNAzyme and Hemin/G-Quadruplex as a Label. Pelossof G, Tel-Vered R, Willner I. Anal Chem. 2012 Mar 15. [Epub ahead of print] PMID: 22424055
  7. A G-quadruplex based label-free fluorescent biosensor for lead ion. Guo L, Nie D, Qiu C, Zheng Q, Wu H, Ye P, Hao Y, Fu F, Chen G. Biosens Bioelectron. 2012 Feb 24. [Epub before print] PMID: 22417873
  8. G-Quadruplex as Signal Transducer for Biorecognition Events. Lv L, Guo Z, Wang J, Wang E. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22380517
  9. G-Quadruplex Based Probes for Visual Detection and Sensing. Neo JL, Kamaladasan K, Uttamchandani M. Curr Pharm Des. 2012 Feb 27. [Epub before print] PMID: 22380516
  10. G-quadruplex DNA Aptamers and their Ligands: Structure, Function and Application. Tucker WO, Shum KT, Tanner JA. Curr Pharm Des. 2012 Feb 27. [Epub before print] PMID: 22376117
  11. A label-free, G-quadruplex DNAzyme-based fluorescent probe for signal-amplified DNA detection and turn-on assay of endonuclease. Zhou Z, Du Y, Zhang L, Dong S. Biosens Bioelectron. 2012 Jan 28. [Epub ahead of print] PMID: 22366377
  12. A label-free fluorescence DNA probe based on ligation reaction with quadruplex formation for highly sensitive and selective detection of nicotinamide adenine dinucleotide. J Zhao, L Zhang, J Jiang, G Shen, and R Yu. Chem Commun. 2012.
  13. Label-free Fluorescent Detection of Ions, Proteins and Small Molecules Using Structure-Switching Aptamers, SYBR Gold and Exonuclease. D Zheng, R Zou, and X Lou. Anal Chem. 2012. [Epub before print]
  14. G-Quadruplex as Signal Transducer for Biorecognition Events. L Lv, Z Guo, J Wang, and E Wang. Curr Pharm Des. 2012. [Epub before print]
  15. G-quadruplex DNA Aptamers and their Ligands: Structure, Function and Application. WO Tucker, KT Shum, and JA Tanner. Curr Pharm Des. 2012. [Epub before print]
  16. A novel biosensing strategy for screening G-quadruplex ligands based on graphene oxide sheets. H Wang, T Chen, S Wu, X Chu, and R Yu. Biosens Bioelectron. 2012. [Epub before print]
  17. Single strand DNA catenane synthesis using the formation of G-quadruplex structure. Sannohe Y, Sugiyama H. Bioorg Med Chem. 2012 Feb 1. [Epub before print] PMID: 22364954
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• GQ-Recognition. Discovery and development of (mostly) small molecule ligands that recognize GQs (ynthesis; design; pharmacology; medicinal chemistry). [29 articles]


  1. Dimeric 1,3-Phenylene-bis(piperazinyl benzimidazole)s: Synthesis and Structure-Activity Investigations on their Binding with Human Telomeric G-Quadruplex DNA and Telomerase Inhibition Properties. Jain AK, Paul A, Maji B, Muniyappa K, Bhattacharya S. J Med Chem. 2012 Mar 27. [Epub ahead of print]PMID: 22452380
  2. Molecular basis of structure-activity relationships between salphen metal complexes and human telomeric DNA quadruplexes. Campbell NH, Karim NH, Parkinson GN, Gunaratnam M, Petrucci V, Todd AK, Vilar R, Neidle S. J Med Chem. 2012 Jan 12; 55 (1):209-222. Epub 2011 Dec 13. PMID: 22112241
  3. Structural polymorphism of human telomere G-quadruplex induced by a pyridyl carboxamide molecule. Xu L, Xu Z, Shang Y, Feng S, Zhou X. Bioorg Med Chem Lett. 2012 Feb 28. [Epub ahead of print] PMID: 22440628
  4. A Caged Ligand for a Telomeric G-Quadruplex. Nakamura T, Iida K, Tera M, Shin-Ya K, Seimiya H, Nagasawa K. Chembiochem. 2012 Mar 21. doi: 10.1002/cbic.201200013. [Epub ahead of print] PMID: 22438312
  5. Structure, function and targeting of human telomere RNA. Xu Y, Komiyama M. Methods. 2012 Mar 8. [Epub ahead of print] PMID: 22425636
  6. G-quadruplexes: targets and tools in anticancer drug design. Düchler M. J Drug Target. 2012 Mar 19. [Epub ahead of print] PMID: 22424091
  7. Identification of novel telomeric G-quadruplex-targeting chemical scaffolds through screening of three NCI libraries. Rahman KM, Tizkova K, Reszka AP, Neidle S, Thurston DE. Bioorg Med Chem Lett. 2012 Feb 16. [Epub ahead of print] PMID: 22421021
  8. Bisquinolinium compounds induce quadruplex-specific transcriptome changes in HeLa S3 cell lines. Halder R, Riou JF, Teulade-Fichou MP, Frickey T, Hartig JS. BMC Res Notes. 2012 Mar 13;5(1):138. [Epub ahead of print] PMID: 22414013
  9. Spectroscopic probing of recognition of the G-quadruplex in c-kit promoter by small-molecule natural products. Cui X, Lin S, Yuan G. Int J Biol Macromol. 2012 Mar 3. [Epub ahead of print] PMID: 22405847
  10. In silico screening of quadruplex-binding ligands. Ma DL, Ma VP, Chan DS, Leung KH, Zhong HJ, Leung CH. Methods. 2012 Feb 26. [Epub ahead of print] PMID: 22391485
  11. Heterocyclic Dications as a New Class of Telomeric G-Quadruplex Targeting Agents.  Nanjunda R, Musetti C, Kumar A, Ismail MA, Farahat AA, Wang S, Sissi C, Palumbo M, Boykin DW, Wilson WD. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22380518
  12. Synthesis of Small Molecules Targeting Multiple DNA Structures using Click Chemistry. Howell LA, Bowater RA, O’Connell MA, Reszka AP, Neidle S, Searcey M. ChemMedChem. 2012 Feb 29. doi: 10.1002/cmdc.201200060. [Epub ahead of print] PMID: 22378532
  13. Human Telomere RNA: A Potential Target for Ligand Recognition. Xu Y. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376119
  14. Screening of a Chemical Library by HT-G4-FID for Discovery of Selective G-quadruplex Binders. Largy E, Saettel N, Hamon F, Dubruille S, Teulade-Fichou MP. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376118
  15. Searching Drug-like Anti-cancer Compound(s) Based on G-Quadruplex Ligands. Li Q, Xiang JF, Zhang H, Tang YL. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376116
  16. The Polymorfisms of DNA G-Quadruplex investigated by Docking Experiments with Telomestatin Enantiomers. Alcaro S, Costa G, Distinto S, Moraca F, Ortuso F, Parrotta L, Artese A. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376115
  17. G-Quadruplex Binding Ligands: from Naturally Occurring to Rationally Designed Molecules. Le TV, Han S, Chae J, Park HJ. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376113
  18. Targeting DNA G-Quadruplex Structures with Peptide Nucleic Acids. Panyutin IG, Onyshchenko MI, Englund EA, Appella DH, Neumann RD. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376112
  19. Luminescent G-quadruplex Probes. Ma DL, Chan DS, Yang H, He HZ, Leung CH. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376110
  20. Experimental Methods for Studying the Interactions between G-Quadruplex Structures and Ligands Jaumot J, Gargallo R. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376108
  21. Structure Conversion and Structure Separation of G-Quadruplexes Investigated by Carbazole Derivatives. Chang TC, Chu JF, Tsai YL, Wang ZF. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376106
  22. Recent Developments in the Chemistry and Biology of G-Quadruplexes with Reference to the DNA Groove Binders. Jain AK, Bhattacharya S. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376105
  23. State-of-the-Art Methodologies for the Discovery and Characterization of DNA G-Quadruplex Binder. Pagano B, Cosconati S, Gabelica V, Petraccone L, De Tito S, Marinelli L, La Pietra V, di Leva FS, Lauri I, Trotta R, Novellino E, Giancola C, Randazzo A. Curr Pharm Des. 2012 Feb 27. [Epub ahead of print] PMID: 22376104
  24. Stabilization of G-Quadruplex DNA, Inhibition of Telomerase Activity and Live Cell Imaging Studies of Chiral Ruthenium(II) Complexes. Sun D, Liu Y, Liu D, Zhang R, Yang X, Liu J. Chemistry. 2012 Feb 24. doi: 10.1002/chem.201103156. [Epub ahead of print] PMID: 22367788
  25. Hybrid ligand-alkylating agents targeting telomeric G-quadruplex structures. Doria F, Nadai M, Folini M, Di Antonio M, Germani L, Percivalle C, Sissi C, Zaffaroni N, Alcaro S, Artese A, Richter SN, Freccero M. Org Biomol Chem. 2012 Feb 27. [Epub ahead of print] PMID: 22367401
  26. Interaction of human telomeric DNA with N-methyl mesoporphyrin IX. [OA] Nicoludis JM, Barrett SP, Mergny JL, Yatsunyk LA. Nucleic Acids Res. 2012 Feb 23. [Epub ahead of print] PMID: 22362740
  27. Luminescent detection of DNA-binding proteins [OA] Chung-Hang Leung, Daniel Shiu-Hin Chan, Hong-Zhang He, Zhen Cheng, Hui Yang, and Dik-Lung Ma. Nucleic Acids Res. 2012; 40:941-955.
  28. Unraveling the structural complexity in a single-stranded RNA tail: implications for efficient ligand binding in the prequeuosine riboswitch [OA] Catherine D. Eichhorn, Jun Feng, Krishna C. Suddala, Nils G. Walter, Charles L. Brooks, III, and Hashim M. Al-Hashimi. Nucleic Acids Res. 2012; 40:1345-1355.
  29. Identifying G-quadruplex-binding ligands using DNA-functionalized gold nanoparticles. Y Qiao, J Deng, Y Jin, G Chen, & L Wang. Analyst. 2012; 137: 1663.
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• GQ-Structure & Dynamics. Studies aimed at elucidating structure and/or dynamics GQ. This includes experimental techniques such as X-Ray crystallography, NMR, and other spectroscopic methods as well as theoretical approaches such as MD-simulations. [7 articles]

  1. RNA G-Quadruplexes: G-quadruplexes with “U” Turns. Agarwal T, Jayaraj G, Pandey SP, Agarwala P, Maiti S. Curr Pharm Des. 2012 Feb 27. [Epub before print] PMID: 22376111
  2. Formation of pearl-necklace monomorphic G-quadruplexes in the human CEB25 minisatellite. Amrane S, Adrian M, Heddi B, Serero A, Nicolas A, Mergny JL, Phan AT. J Am Chem Soc. 2012 Feb 29. [Epub before print] PMID: 22376028
  3. The Tertiary DNA Structure in the Single-Stranded hTERT Promoter Fragment Unfolds and Refolds by Parallel Pathways via Cooperative or Sequential Events. Yu Z, Gaerig V, Cui Y, Kang H, Gokhale V, Zhao Y, Hurley LH, Mao H. J Am Chem Soc. 2012 Feb 28. [Epub before print] PMID: 22372563
  4. Stability and free energy calculation of LNA modified quadruplex: a molecular dynamics study. AK Chaubey, KD Dubey, and RP Ojha. J Comput Aided Mol Des. 2012. [Epub before print]
  5. Studying the effect of crowding and dehydration on DNA G-quadruplexes. L Petraccone, B Pagano, and C Giancola. Methods. 2012. [Epub before print]
  6. Stability and Structure of Long Intramolecular G-quadruplexes. L Payet and JL Huppert. Biochemistry. 2012. [Epub before print]
  7. The high-resolution crystal structure of a parallel intermolecular DNA G-4 quadruplex/drug complex employing syn glycosyl linkages [OA] GR Clark, PD Pytel, and CJ Squire. Nucleic Acids Res. 2012. [Epub before print]
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• GQ-Supramolecular. Studies related to the design and applications of GQs in supramolecular chemistry. Of particular interest are studies on the use of independent guanosine subunits to guide the self-assembly of complex structures. [o articles]


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This post includes 78 articles divided by categories as follows:

  • GQ-Biology.  13 articles
  • GQ-Methods11 articles
  • GQ-Cations1 article
  • GQ-Nano & Technology. 17 articles
  • GQ-Recognition29 articles
  • GQ-Structure & Dynamics7 articles
  • GQ-Supramolecular0 articles
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[OA] = Open Access


Battle for supremacy between G-Quadruplex DNA fluorescent probes

March 8, 2012 13 comments

Fluorescence properties of 8-(2-pyridyl)guanine “2PyG” as compared to 2-aminopurine in DNA

Anälle Dumas and Nathan W. Luedtke*

ChemBioChem 2011, 12, 2044–2051; DOI: 10.1002/cbic.201100214

A synopsis by María Del C. Rivera-Sánchez

The motivation of the work reported by Dumas and Luedtke is the development of internal probes for direct readouts of local nucleobases arrangements, dynamics and electronic properties (e.g., electron transfer reactions). Their strategy is based on the incorporation of internal fluorescent probes as energy acceptors in DNA, particularly in hTelo and cKit sequences that fold into oligo-G-quadruplexes (OGQs).

In this article the authors include many of their previously reported data related to 2PyG [Refs 17 and 18] in order to compare its properties with those of 2-aminopurine (2AP), a nucleoside that was not previously evaluated as an internal fluorescent probe for OGQs when directly incorporated into folded G-tetrads. Each publication has different pieces of the puzzle towards understanding the importance of 2PyG as a plausible fluorescent probe and how it compares with other potential probes like 2AP. Thus, from those “scattered” pieces of information the picture that emerges can be summarized in the synthesis of a small family of 8-substituted-2’-deoxyguanosine analogues (2PyG, 4PVG and STG) and the evaluation of their photophysical properties in CH3CN and H2O. The cool part is that the phosphoramidite versions of these analogues were synthesized and the nucleosides incorporated into strategic positions of hTelo and cKit OGQs. The impact on the global structure and stability of hTeloG9, hTelo17, hTeloG23, cKitG10 or cKit15 having 8-substituted analogues, 2AP or thymine directly incorporated into folded G-tetrads, was evaluated by means of circular dichroism (CD) and CD-melting assays. Experiments using the afore mentioned ss OGQs were done in K+-, Na+-, and Li+-buffer and were compared to data from ds hTeloG9, ds hTeloG17, ds hTeloG23, and ds cKitG15 in Na+-buffer. In addition, the proficiency of analogues like 2PyG, 2AP and thymine as internal fluorescence probes was assed by measuring the quantum yield (Φ) and energy-transfer efficiency (ηT) of the substituted-duplex and ss-OGQs.

The data gathered from these experiments points to 2PyG as an outstanding internal fluorescent probe due to its higher quantum yield (Φ), once incorporated into folded oligonucleotides (Φ = 0.03–0.15) versus the free nucleoside in water (Φ =0.02), when compared to all other nucleosides evaluated. In addition, when exciting at 260 nm, the energy-transfer efficiencies from unmodified bases to 2PyG are 4–10-fold higher in ss-OGQs than in the corresponding duplex DNA. This energy-transfer process is favored by the O6 ion coordination within the central channel of G-tetrads and is distinctive of GQ structures (not duplex DNA). When this phenomena is combined with the high molar absorptivity of DNA it results in fluorescence enhancements of 10–30-fold for 2PyG-containing OGQs versus the corresponding ss- or ds-DNA. This highlights the potential of using 2PyG as a fluorescent probe for the detection of OGQ formation at lower concentrations among other applications. Unfortunately, the Φ or ηT of 2AP-containing DNAs are much lower than those for 2PyG-containing DNAs.

The ideal internal fluorescent probe should have very little effect on the global structure of the system evaluated. Particularly, the effect of 2PyG incorporation within folded G-tetrads seems to be context dependent. For example, 2PyG have little impact on the global structure and positive stability of hTeloG9 in K+- or Na+-buffer do to the syn conformational preference shared by this position and 2PyG. However, even though G15 in cKit (wt) have an anti conformational preference, CD spectra suggest that the incorporation of 2PyG have little impact on the global structure, but caused a small decreased in the Tm of cKitG15. On the contrary, the incorporation of 2PyG at hTeloG23 (in K+ or Na+-buffer) just allows the formation of an OGQ structure where G23 is in a syn conformation that is mainly observed on Na+-buffer. As a general trend, considering all the data discuss in the article, we can say that base stacking and pairing interactions can sometimes overcome the energy barrier of a preferred glycosidic bond conformation stabilizing the resulting OGQ or ds-DNA structure. Still, 2PyG has to be strategically located within OGQs to minimize detrimental effects, although, similar substitutions with 2AP or thymine are much more significant. Regarding 2AP, a priori I would not consider it a good mimic of guanine when positioned directly into folded G-tetrads because it lacks a carbonyl at the C6 and the N1-H, which prevents the formation of at least three interactions essential for an effective participation in the formation of a G-tetrad. Therefore, I consider that the comparison of 2PyG against other 8-substitutted nucleobases as they did on ref. 18 is more appropriate than comparing it against 2AP. The system reported by Dumas and Luedtke might have applications on fundamental studies related to ODNs and/or OQGs dynamics and their electronic properties, but I don’t picture them into practical, biophysical or technological applications.

This was a nice article in which it the authors combined many previous results with new complementary data provides a better understanding of the true potential and limitations of 2PyG as an internal fluorescent probe. They also evaluated for the detrimental effect induced by 2AP when incorporated into folded G-tetrads. The experiments reported included the appropriate controls like those done using thymine-containing sequences. In addition, their experimental section includes appropriate details such as the preparation of the DNA samples used.

Energetics of cations moving within G-Quadruplex DNA

February 8, 2012 14 comments
Parisa Akhshi, Nicholas J. Mosey, Gang Wu*
Angew Chem Int Ed Engl. 2012 Jan 13. doi: 10.1002/anie.201107700.
PMID: 22241618
A synopsis by Mariana Martín-Hidalgo

Gang Wu and coworkers are presenting in this short communication a molecular dynamic simulation to elucidate the free-energy landscape for the movement of three monovalent cations (Na+, K+, NH4+)through the central channel of a tetramolecular oligo G-quadruplex (OGQ).  The importance of this work strikes in the potential use of OGQs as synthetic ion channels, an application that has been considered by a number of research groups in last decade.

To perform this study they divided the ion movement in two regions: inside the OGQ and at the entrance/exit region.  They found that for the inner OGQ region, Na+ showed a lower energy barrier (4-5 kcal/mol) when compared to K+ and NH4+ (13-15 kcal/mol).  They made reference to experimental data to backup these computational results, plus they argue that the ionic radii differences between them are responsible for the observed energy barriers.  K+ and NH4+ have similar ionic radii (1.51 and 1.66 Å for octahedral coordinate ions respectively) while Na+ (1.18 Å) being a little bit smaller can diffuse through the tetrads easily.

They also highlighted the possibility of having what they refer to as “leaks” through the tetrad (sideway movement of ions) instead of the proposed continuous ion movement through the central channel.  They basically found that the energy barrier for that ion movement is too high (50-60 kcal/mol) to make it possible, discarding this possibility. I have to bring an issue related to their expression in this paragraph (second page, first paragraph), because they mentioned and I cite: “ there has never been experimental proof that ions would not “leak” out from the side wall of the G-quadruplex channel”.  I know the authors are emphasizing in the study of ion movement for OGQ’s but we know that there are OGQs and supramolecular GQs (SGQs) self-assembled from a variety of guanine derivatives. So, in my view they should’ve specified that lateral ion movement haven’t been shown for OGQs (perhaps in a note), but it had for SGQs. Specifically, in 2006 the Davis group reported (JACS 128 (47), 15269) the first evidence of “sideway” displacement for cations in a four-tetrad (4T) SGQ (i.e. a hexadecamer formed from the dimerization of two octamers). The mechanism of exchange of course would be different in a 4T-SGQ like Davis’ when compared to Wu’s 4T-OGQ and we can discuss those on Fridays presentation.

In the second region, the entrance/exit sides, the energy barrier encountered for K+ and NH4+ was 20 kcal/mol, while for Na+ was 14 kcal/mol, both values correlate well with the experimental data reported in the literature. Another important point of discussion the hydration states of these cations.  The inner cations are fully dehydrated while the ones located at the entrance/exit positions might be hydrated because of the transition to/from the bulk media.

From my point of view the most important part of this report is their comparison with a potassium ion channel.  All the gathered computational data reveals that the use of this or related sequences as K+ channels need to overcome significant energy barriers, even for the smaller Na+, if they are to be used as synthetic ion channels.

Although my technical knowledge of how to perform MDS is minimal, they contribute a very important part for the development of a molecular research project.  I think it will be great to have some fundamental MDS studies for some of our derivatives in relation to the ion movement not only in organic media, but also in aqueous environments.  As we have discovered in recent years, not all SGQs behave the same even if they have the same central guanine core in common.  Cations play a very important role in controlling these assemblies and I believe there is a need to put more effort in this regard, in particular with our system.  Any volunteers?

Categories: Lab-blog Tags: , , ,

Structural elucidation of dimeric DNA G-quadruplexes

February 1, 2012 13 comments

Stacking of G-quadruplexes: NMR structure of a G-rich oligonucleotide with potential anti-HIV and anticancer activity

Ngoc Quang Do, Kah Wai Lim, Ming Hoon Teo, Brahim Heddi1 and Anh Tuan Phan

Nucleic Acids Research, 2011, Vol. 39, No. 21, 9448–9457, doi:10.1093/nar/gkr539

A synopsis by Marilyn García-Arriaga

In order to gain better understanding of the nature of this structures, Phan and colleagues reported the structural analysis of a dimeric OGQ with the sequence (GGGT)4 (T30695) in K+ solution. This dimer is composed of two identical propeller-type parallel-stranded OGQ subunits each containing three tetrads that are stacked via the 5’-5’ interface. NMR structural studies of the OGQ formed by T30695 and T40214 ((GGGC)4), in K+ solution, share similar 1D and 2D NOESY spectral features. Furthermore, preliminary CD studies show the positive band at 260 nm characteristic of a parallel-stranded OGQ, in contrast to a previous report. In order to perform a detailed structural analysis by NMR an accurate assignment of the signals is essential. This task is more challenging in systems of high symmetry, thus, to overcome this problem they prepared a T30695 analogue with a single guanine-to-inosine substitution, GIGT(GGGT)3 (). This modification greatly improves the NMR spectra of the assembly allowing the assignment of the signals without ambiguity. Not only does this derivative show the same structural characteristics in the 1D and 2D NOESY spectra, but it also show similar positive band in the CD spectra and pattern in the gel electrophoresis experiments. 15N-labeling of the guanine imino protons and other protons of J19 enabled establishing the correlations in the COSY, TOCSY HSQC and NOESY spectra. In contrast to what was previously reported, the moderate intensity of the intra-residue H8/H6-H10 NOEs suggest that all residues adopt anti glycosidic bond conformation. The combined evidence suggested that the resulting structure is a propeller-type parallel-stranded OGQ with a three-tetrad core and three double-chain-reversal loops.

Evidence of the 5’-end stacking to form the dimer was obtained from gel electrophoresis in which the migration rate of J19 was similar to that of 93del, an interlocked dimeric OGQ. In addition, the migration rate of J19 was slower than that of a monomeric propeller-type OGQ. Furthermore, solvent-exchange experiments reveal that the imino protons of guanines in the outer tetrads (5’-end) are protected from exchange with D2O. Also, additions of bases in the 5’-end of J19 disrupt the dimer formation. The solution structure of J19 was generated after distance-restrained molecular dynamics refinement in this structure the core of the quadruplex show a close packing across the interfaces of the tetrads. Also, the directionality of the hydrogen bonds was the same for each subunit and opposite between the two structures in the dimer. The thymine bases are projected outwards in a double-chain-reversal loop. In more details, the sugars from the two end-tetrads are contiguous to one another and the backbones of the two dimer subunits are aligned in a staggered mode, maximizing the overlap of the five and six membered rings on the interface. They were able to conclude this by the identification of NOEs correlations among the base and the sugar protons of the end tetrads.

Finally, in order to assess if those OGQs conserved anti-HIV activity, they performed a reverse ‘disintegration’ reaction assay using T30695, J19 and their derivatives. They concluded that the derivatives containing thymines at the 5’-end were less active, which can be attributed to the lost of their ability to form stacked dimeric structures.

Once again Phan and colleagues present an impressive amount of work, but most of all, an incredible level of analysis. At the experimental level, the work is well supported and all the proper control experiments were performed. In contrast, the narrative and presentation of the data was least successful, in my opinion, it lacks details in the arguments of some conclusions.