151
|
Liao GL, Chen X, Ji LN, Chao H. Visual specific luminescent probing of hybrid G-quadruplex DNA by a ruthenium polypyridyl complex. Chem Commun (Camb) 2012; 48:10781-3. [DOI: 10.1039/c2cc36039j] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
152
|
RNA Folding Algorithms with G-Quadruplexes. ADVANCES IN BIOINFORMATICS AND COMPUTATIONAL BIOLOGY 2012. [DOI: 10.1007/978-3-642-31927-3_5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
153
|
Kelsey I, Nakayama S, Sintim HO. Diamidinium and iminium aromatics as new aggregators of the bacterial signaling molecule, c-di-GMP. Bioorg Med Chem Lett 2011; 22:881-5. [PMID: 22217869 DOI: 10.1016/j.bmcl.2011.12.039] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Revised: 12/06/2011] [Accepted: 12/08/2011] [Indexed: 01/28/2023]
Abstract
C-di-GMP has emerged as an important bacterial signaling molecule that is involved in biofilm formation. Small molecules that can form biologically inactive complexes with c-di-GMP have the potential to be used as anti-biofilm agents. Herein, we report that water-soluble diamidinium/iminium aromatics (such as berenil), which are traditionally considered as minor groove binders of nucleic acids, are capable of aggregating c-di-GMP into G-quadruplexes via π-stacking interactions.
Collapse
Affiliation(s)
- Ilana Kelsey
- University of Maryland, College Park, MD 20742, USA
| | | | | |
Collapse
|
154
|
Moriyama R, Shimada N, Kano A, Maruyama A. The role of cationic comb-type copolymers in chaperoning DNA annealing. Biomaterials 2011; 32:7671-6. [DOI: 10.1016/j.biomaterials.2011.06.056] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Accepted: 06/23/2011] [Indexed: 02/05/2023]
|
155
|
Miller MC, Trent JO. Resolution of quadruplex polymorphism by size-exclusion chromatography. ACTA ACUST UNITED AC 2011; Chapter 17:Unit17.3. [PMID: 21638270 DOI: 10.1002/0471142700.nc1703s45] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This unit describes a method for separation of quadruplex species formed from the same sequence via size-exclusion chromatography (SEC). Polymorphism is inherent to quadruplex formation, and even relatively simple quadruplex-forming sequences, such as the human telomere sequence d(GGG(TTAGGG)(3)), can form a myriad of possible configurations. HPLC, especially using reversed-phase and anion-exchange methods, has been a mainstay of nucleic acids research and purification for many decades. These methods have been applied for separation of individual quadruplex species formed in a mixture from the same parent sequence.
Collapse
Affiliation(s)
- M Clarke Miller
- James Graham Brown Cancer Center, University of Louisville, Louisville, Kentucky, USA
| | | |
Collapse
|
156
|
Miller MC, Le HT, Dean WL, Holt PA, Chaires JB, Trent JO. Polymorphism and resolution of oncogene promoter quadruplex-forming sequences. Org Biomol Chem 2011; 9:7633-7. [PMID: 21938285 DOI: 10.1039/c1ob05891f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We report the separation of several quadruplex species formed by ten promoter sequences by Size Exclusion Chromatography (SEC). Modification at the 5' or 3' ends or in loop regions of quadruplex forming sequences has become the standard technique for dealing with quadruplex polymorphism. However, conformations produced employing this method or by other means of artificially shifting the equilibrium may not represent the species that are present in vivo. This method enables an unperturbed view of the structural polymorphism inherent to quadruplex formation. Separation via SEC facilitates studies on quadruplex structure and biophysical properties without the need for sequence modification.
Collapse
Affiliation(s)
- M Clarke Miller
- Department of Medicine, University of Louisville, Louisville, KY 40202, USA
| | | | | | | | | | | |
Collapse
|
157
|
Karsisiotis AI, Hessari NM, Novellino E, Spada GP, Randazzo A, Webba da Silva M. Topological Characterization of Nucleic Acid G-Quadruplexes by UV Absorption and Circular Dichroism. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201105193] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
158
|
Karsisiotis AI, Hessari NM, Novellino E, Spada GP, Randazzo A, Webba da Silva M. Topological characterization of nucleic acid G-quadruplexes by UV absorption and circular dichroism. Angew Chem Int Ed Engl 2011; 50:10645-8. [PMID: 21928459 DOI: 10.1002/anie.201105193] [Citation(s) in RCA: 325] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2011] [Indexed: 11/07/2022]
|
159
|
Cang X, Šponer J, Cheatham TE. Insight into G-DNA structural polymorphism and folding from sequence and loop connectivity through free energy analysis. J Am Chem Soc 2011; 133:14270-9. [PMID: 21761922 PMCID: PMC3168932 DOI: 10.1021/ja107805r] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
![]()
The lengths of G-tracts and their connecting loop sequences determine G-quadruplex folding and stability. Complete understanding of the sequence–structure relationships remains elusive. Here, single-loop G-quadruplexes were investigated using explicit solvent molecular dynamics (MD) simulations to characterize the effect of loop length, loop sequence, and G-tract length on the folding topologies and stability of G-quadruplexes. Eight loop types, including different variants of lateral, diagonal, and propeller loops, and six different loop sequences [d0 (i.e., no intervening residues in the loop), dT, dT2, dT3, dTTA, and dT4] were considered through MD simulation and free energy analysis. In most cases the free energetic estimates agree well with the experimental observations. The work also provides new insight into G-quadruplex folding and stability. This includes reporting the observed instability of the left propeller loop, which extends the rules for G-quadruplex folding. We also suggest a plausible explanation why human telomere sequences predominantly form hybrid-I and hybrid-II type structures in K+ solution. Overall, our calculation results indicate that short loops generally are less stable than longer loops, and we hypothesize that the extreme stability of sequences with very short loops could possibly derive from the formation of parallel multimers. The results suggest that free energy differences, estimated from MD and free energy analysis with current force fields and simulation protocols, are able to complement experiment and to help dissect and explain loop sequence, loop length, and G-tract length and orientation influences on G-quadruplex structure.
Collapse
Affiliation(s)
- Xiaohui Cang
- Department of Medicinal Chemistry, College of Pharmacy, Skaggs Hall 201, University of Utah, Salt Lake City, Utah 84112, USA
| | | | | |
Collapse
|
160
|
Collie GW, Parkinson GN. The application of DNA and RNA G-quadruplexes to therapeutic medicines. Chem Soc Rev 2011; 40:5867-92. [PMID: 21789296 DOI: 10.1039/c1cs15067g] [Citation(s) in RCA: 461] [Impact Index Per Article: 35.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The intriguing structural diversity in folded topologies available to guanine-rich nucleic acid repeat sequences have made four-stranded G-quadruplex structures the focus of both basic and applied research, from cancer biology and novel therapeutics through to nanoelectronics. Distributed widely in the human genome as targets for regulating gene expression and chromosomal maintenance, they offer unique avenues for future cancer drug development. In particular, the recent advances in chemical and structural biology have enabled the construction of bespoke selective DNA based aptamers to be used as novel therapeutic agents and access to detailed structural models for structure based drug discovery. In this critical review, we will explore the important underlying characteristics of G-quadruplexes that make them functional, stable, and predictable nanoscaffolds. We will review the current structural database of folding topologies, molecular interfaces and novel interaction surfaces, with a consideration to their future exploitation in drug discovery, molecular biology, supermolecular assembly and aptamer design. In recent years the number of potential applications for G-quadruplex motifs has rapidly grown, so in this review we aim to explore the many future challenges and highlight where possible successes may lie. We will highlight the similarities and differences between DNA and RNA folded G-quadruplexes in terms of stability, distribution, and exploitability as small molecule targets. Finally, we will provide a detailed review of basic G-quadruplex geometry, experimental tools used, and a critical evaluation of the application of high-resolution structural biology and its ability to provide meaningful and valid models for future applications (255 references).
Collapse
Affiliation(s)
- Gavin W Collie
- CRUK Biomolecular Structure Group, The School of Pharmacy, University of London, London, UK WC1N 1AX
| | | |
Collapse
|
161
|
Mashimo T, Yagi H, Sannohe Y, Rajendran A, Sugiyama H. Folding pathways of human telomeric type-1 and type-2 G-quadruplex structures. J Am Chem Soc 2011; 132:14910-8. [PMID: 20882978 DOI: 10.1021/ja105806u] [Citation(s) in RCA: 147] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We have investigated new folding pathways of human telomeric type-1 and type-2 G-quadruplex conformations via intermediate hairpin and triplex structures. The stabilization energies calculated by ab initio methods evidenced the formation of a hairpin structure with Hoogsteen GG base pairs. Further calculations revealed that the G-triplet is more stable than the hairpin conformation and equally stable when compared to the G-tetrad. This indicated the possibility of a triplex intermediate. The overall folding is facilitated by K(+) association in each step, as it decreases the electrostatic repulsion. The K(+) binding site was identified by molecular dynamics simulations. We then focused on the syn/anti arrangement and found that the anti conformation of deoxyguanosine is more stable than the syn conformation, which indicated that folding would increase the number of anti conformations. The K(+) binding to a hairpin near the second lateral TTA loop was found to be preferable, considering entropic effects. Stacking of G-tetrads with the same conformation (anti/anti or syn/syn) is more stable than mixed stacking (anti/syn and vice versa). These results suggest the formation of type-1 and type-2 G-quadruplex structures with the possibility of hairpin and triplex intermediates.
Collapse
Affiliation(s)
- Tomoko Mashimo
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | | | | | | | | |
Collapse
|
162
|
Campbell NH, Smith DL, Reszka AP, Neidle S, O'Hagan D. Fluorine in medicinal chemistry: β-fluorination of peripheral pyrrolidines attached to acridine ligands affects their interactions with G-quadruplex DNA. Org Biomol Chem 2011; 9:1328-31. [PMID: 21221451 DOI: 10.1039/c0ob00886a] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Comparative X-ray structure studies reveal that C-F bond incorporation into the peripheral pyrrolidine moieties of the G-quadruplex DNA binding ligand BSU6039 leads to a distinct pyrrolidine ring conformation, relative to the non-fluorinated analogue, and with a different binding mode involving reversal of the pyrrolidinium N(+)-H orientation.
Collapse
Affiliation(s)
- Nancy H Campbell
- The School of Pharmacy, University of London, 29-39 Brunswick Square, London, UK WC1N 1AX
| | | | | | | | | |
Collapse
|
163
|
Pagba CV, Lane SM, Wachsmann-Hogiu S. Conformational changes in quadruplex oligonucleotide structures probed by Raman spectroscopy. BIOMEDICAL OPTICS EXPRESS 2010; 2:207-17. [PMID: 21339867 PMCID: PMC3038437 DOI: 10.1364/boe.2.000207] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Revised: 12/07/2010] [Accepted: 12/18/2010] [Indexed: 05/02/2023]
Abstract
Quadruplex structures are higher order structures formed by guanine-rich oligonucleotides. In the present study, temperature-induced conformational changes in the quadruplex structures of aptamers and other guanine-rich oligonucleotides are probed by Raman spectroscopy. In particular, dramatic changes in the fingerprint region are observed in the spectra of thrombin binding aptamer at higher temperatures. These changes are accompanied by a decrease in the intensity of the 1480 cm(-1) peak (attributed to C8 = N7-H2), which is diagnostic of the quadruplex structure. We also show that these changes can be reversed (to a certain extent) by addition of K(+) ions.
Collapse
Affiliation(s)
- Cynthia V. Pagba
- Center for Biophotonics Science and Technology, University of California Davis, 2700 Stockton Blvd., Suite 1400, Sacramento, CA 95817
| | - Stephen M. Lane
- Center for Biophotonics Science and Technology, University of California Davis, 2700 Stockton Blvd., Suite 1400, Sacramento, CA 95817
- Department of Neurological Surgery, University of California Davis, 4860 Y Street, Sacramento, CA 95817
| | - Sebastian Wachsmann-Hogiu
- Center for Biophotonics Science and Technology, University of California Davis, 2700 Stockton Blvd., Suite 1400, Sacramento, CA 95817
- Department of Pathology and Internal Medicine, University of California Davis, 4400 V Street, Sacramento, CA 95817
| |
Collapse
|
164
|
Prislan I, Lah J, Milanic M, Vesnaver G. Kinetically governed polymorphism of d(G₄T₄G₃) quadruplexes in K+ solutions. Nucleic Acids Res 2010; 39:1933-42. [PMID: 21113023 PMCID: PMC3061076 DOI: 10.1093/nar/gkq867] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
It has been generally recognized that understanding the molecular basis of some important cellular processes is hampered by the lack of knowledge of forces that drive spontaneous formation/disruption of G-quadruplex structures in guanine-rich DNA sequences. According to numerous biophysical and structural studies G-quadruplexes may occur in the presence of K(+) and Na(+) ions as polymorphic structures formed in kinetically governed processes. The reported kinetic models suggested to describe this polymorphism should be considered inappropriate since, as a rule, they include bimolecular single-step associations characterized by negative activation energies. In contrast, our approach in studying polymorphic behavior of G-quadruplexes is based on model mechanisms that involve only elementary folding/unfolding transitions and structural conversion steps that are characterized by positive activation energies. Here, we are investigating a complex polymorphism of d(G(4)T(4)G(3)) quadruplexes in K(+) solutions. On the basis of DSC, circular dichroism and UV spectroscopy and polyacrylamide gel electrophoresis experiments we propose a kinetic model that successfully describes the observed thermally induced conformational transitions of d(G(4)T(4)G(3)) quadruplexes in terms of single-step reactions that involve besides single strands also one tetramolecular and three bimolecular quadruplex structures.
Collapse
Affiliation(s)
- Iztok Prislan
- Faculty of Chemistry and Chemical Technology, Physical Chemistry, University of Ljubljana, Askerceva, Slovenia
| | | | | | | |
Collapse
|
165
|
Miller MC, Buscaglia R, Chaires JB, Lane AN, Trent JO. Hydration is a major determinant of the G-quadruplex stability and conformation of the human telomere 3' sequence of d(AG3(TTAG3)3). J Am Chem Soc 2010; 132:17105-7. [PMID: 21087016 DOI: 10.1021/ja105259m] [Citation(s) in RCA: 177] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The factors that determine the conformation and stability of G-quadruplex forming sequences remain poorly understood. Here we demonstrate the influence of cosolvents on the conformation and stability of the human telomeric sequence d(A(GGGTTA)3GGG)) in both K(+) and Na(+) containing solutions using a combination of circular dichroism, NMR, and thermodynamics. Molecular crowding arguments have previously been used to suggest that the parallel quadruplex form may be biologically relevant. However, the small cosolvents previously used, PEG 200 and 400, are actually dehydrating agents. We have used acetonitrile as a non-hydrogen-bonding dehydrating agent; similar conformational transitions were observed in K(+) solution. Moreover, NMR analysis shows that the resulting structure contains non-anti guanine glycosyl torsion angles suggesting that the conformation present in acetonitrile is not identical to the all-parallel crystal structure, despite the supposed parallel type CD spectrum.
Collapse
Affiliation(s)
- M Clarke Miller
- Department of Medicine, Clinical Translational Research Building, University of Louisville, 505 Hancock Street, Louisville, Kentucky 40202, USA
| | | | | | | | | |
Collapse
|
166
|
Guédin A, Gros J, Alberti P, Mergny JL. How long is too long? Effects of loop size on G-quadruplex stability. Nucleic Acids Res 2010; 38:7858-68. [PMID: 20660477 PMCID: PMC2995061 DOI: 10.1093/nar/gkq639] [Citation(s) in RCA: 316] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We compared here 80 different sequences containing four tracts of three guanines with loops of variable length (between 1 and 15 bases for unmodified sequences, up to 30 for fluorescently labeled oligonucleotides). All sequences were capable of forming stable quadruplexes, with Tm above physiological temperature in most cases. Unsurprisingly, the melting temperature was systematically lower in sodium than in potassium but the difference between both ionic conditions varied between 1 and >39°C (average difference: 18.3°C). Depending on the sequence context, and especially for G4 sequences involving two very short loops, the third one may be very long without compromising the stability of the quadruplex. A strong inverse correlation between total loop length and Tm was found in K+: each added base leads to a 2°C drop in Tm or ∼0.3 kcal/mol loss in ΔG°. The trend was less clear in Na+, with a longer than expected optimal loop length (up to 5 nt). This study will therefore extend the sequence repertoire of quadruplex-prone sequences, arguing for a modification of the widely used consensus (maximal loop size of 7 bases).
Collapse
Affiliation(s)
- Aurore Guédin
- INSERM, U869, European Institute of Chemistry and Biology, Bordeaux 2 University, 2 rue Robert Escarpit, Pessac F-33607, France
| | | | | | | |
Collapse
|
167
|
Gomez D, Guédin A, Mergny JL, Salles B, Riou JF, Teulade-Fichou MP, Calsou P. A G-quadruplex structure within the 5'-UTR of TRF2 mRNA represses translation in human cells. Nucleic Acids Res 2010; 38:7187-98. [PMID: 20571083 PMCID: PMC2978344 DOI: 10.1093/nar/gkq563] [Citation(s) in RCA: 145] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Telomeres protect chromosome ends from being recognized as double-stranded breaks. Telomeric function is ensured by the shelterin complex in which TRF2 protein is an essential player. The G-rich strand of telomere DNA can fold into G-quadruplex (G4) structure. Small molecules stabilizing G4 structures, named G4 ligands, have been shown to alter telomeric functions in human cells. In this study, we show that a guanine-rich RNA sequence located in the 5′-UTR region of the TRF2 mRNA (hereafter 91TRF2G) is capable of forming a stable quadruplex that causes a 2.8-fold decrease in the translation of a reporter gene in human cells, as compared to a mutant 5′-UTR unable to fold into G4. We also demonstrate that several highly selective G4 ligands, the pyridine dicarboxamide derivative 360A and bisquinolinium compounds Phen-DC(3) and Phen-DC(6), are able to bind the 91TRF2G:RNA sequence and to modulate TRF2 protein translation in vitro. Since the naturally occurring 5′-UTR TRF2:RNA G4 element was used here, which is conserved in several vertebrate orthologs, the present data substantiate a potential translational mechanism mediated by a G4 RNA motif for the downregulation of TRF2 expression.
Collapse
Affiliation(s)
- Dennis Gomez
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, 31077 Toulouse, Université de Toulouse, UPS, IPBS, F-31077 Toulouse, France
| | | | | | | | | | | | | |
Collapse
|
168
|
Spindler L, Rigler M, Drevensek-Olenik I, Ma'ani Hessari N, Webba da Silva M. Effect of base sequence on g-wire formation in solution. J Nucleic Acids 2010; 2010. [PMID: 20725621 PMCID: PMC2915807 DOI: 10.4061/2010/431651] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2010] [Accepted: 03/22/2010] [Indexed: 11/20/2022] Open
Abstract
The formation and dimensions of G-wires by different short G-rich DNA sequences in solution were investigated by dynamic light scattering (DLS) and polyacrilamide gel electrophoresis (PAGE). To explore the basic principles of wire formation, we studied the effects of base sequence, method of preparation, temperature, and oligonucleotide concentration. Both DLS and PAGE show that thermal annealing induces much less macromolecular self-assembly than dialysis. The degree of assembly and consequently length of G-wires (5-6 nm) are well resolved by both methods for DNA sequences with intermediate length, while some discrepancies appear for the shortest and longest sequences. As expected, the longest DNA sequence gives the longest macromolecular aggregates with a length of about 11 nm as estimated by DLS. The quadruplex topologies show no concentration dependence in the investigated DNA concentration range (0.1 mM–0.4 mM) and no structural change upon heating.
Collapse
Affiliation(s)
- Lea Spindler
- Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | | | | | | | | |
Collapse
|
169
|
Abstract
Double-helical DNA has been shown to conduct both electrons and electron holes, the latter over distances of >20 nm. DNA is thus a material of significant interest for the bottom-up construction of nanocircuitry. Here, we describe a contractile DNA nanoswitch, which can toggle between a structurally extended "off" state and a contracted "on" state, with a 40-fold conductivity difference between the two. To turn on, two short motifs of guanine-guanine mismatches in an otherwise standard double helix synapse to form a conductive G-quadruplex, bypassing an insulating element within the helix. This switch can be turned repeatedly on by treatment with millimolar concentrations of K(+) and turned off by sequestration of the K(+) by a crown ether. Circular dichroism and thymine-thymine photocross-linking experiments reveal that strand orientations within the on state G-quadruplex are wholly antiparallel and that the two conductive double-helices interface with the same face of the quadruplex. Although this DNA nanoswitch is chemically gated, it should be adaptable to other kinds of gating and thus serve as a prototype for increasingly sophisticated and complex electronic devices made of DNA.
Collapse
Affiliation(s)
- Yu Chuan Huang
- Department of Molecular Biology & Biochemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | | |
Collapse
|
170
|
Dailey MM, Miller MC, Bates PJ, Lane AN, Trent JO. Resolution and characterization of the structural polymorphism of a single quadruplex-forming sequence. Nucleic Acids Res 2010; 38:4877-88. [PMID: 20348136 PMCID: PMC2919704 DOI: 10.1093/nar/gkq166] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The remarkable structural polymorphism of quadruplex-forming sequences has been a considerable impediment in the elucidation of quadruplex folds. Sequence modifications have commonly been used to perturb and purportedly select a particular form out of the ensemble of folds for nuclear magnetic resonance (NMR) or X-ray crystallographic analysis. Here we report a simple chromatographic technique that separates the individual folds without need for sequence modification. The sequence d(GGTGGTGGTGGTTGTGGTGGTGGTGG) forms a compact quadruplex according to a variety of common biophysical techniques. However, NMR and chromatography showed that this oligonucleotide produces at least eight monomeric quadruplex species that interconvert very slowly at room temperature. We have used a combination of spectroscopic, hydrodynamic and thermodynamic techniques to evaluate the physicochemical properties of the mixture and the individual species. These species have almost identical thermodynamic, hydrodynamic and electrophoretic properties, but significantly different NMR and circular dichroism (CD) spectra, as well as kinetic stability. These results demonstrate that simple standard low-resolution techniques cannot always be used for quadruplex fold determination or quality control purposes, and that simple thermodynamic analysis does not directly provide interpretable thermodynamic parameters.
Collapse
Affiliation(s)
- Magdalena M Dailey
- Department of Chemistry, University of Louisville, Louisville, KY 40202, USA
| | | | | | | | | |
Collapse
|
171
|
Hong Y, Xiong H, Lam J, Häußler M, Liu J, Yu Y, Zhong Y, Sung H, Williams I, Wong K, Tang B. Fluorescent Bioprobes: Structural Matching in the Docking Processes of Aggregation-Induced Emission Fluorogens on DNA Surfaces. Chemistry 2010; 16:1232-45. [DOI: 10.1002/chem.200900778] [Citation(s) in RCA: 158] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
|
172
|
Webba da Silva M, Trajkovski M, Sannohe Y, Ma'ani Hessari N, Sugiyama H, Plavec J. Design of a G-quadruplex topology through glycosidic bond angles. Angew Chem Int Ed Engl 2010; 48:9167-70. [PMID: 19882602 DOI: 10.1002/anie.200902454] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Mateus Webba da Silva
- School of Biomedical Sciences, University of Ulster and Biomedical Sciences Research Institute, University of Ulster, Cromore Road, Coleraine BT52 1SA, UK.
| | | | | | | | | | | |
Collapse
|
173
|
Haider S, Neidle S. Molecular modeling and simulation of G-quadruplexes and quadruplex-ligand complexes. Methods Mol Biol 2010; 608:17-37. [PMID: 20012413 DOI: 10.1007/978-1-59745-363-9_2] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Methods for the molecular modeling and simulation of G-quadruplex structures and their drug/ligand complexes are discussed, and a range of protocols is presented for undertaking a variety of tasks including model-building, ligand docking, dynamics simulation, continuum solvent modeling, energetic calculations, principal component analysis, and quantum chemical computations. The scope and limitations of these approaches are discussed.
Collapse
Affiliation(s)
- Shozeb Haider
- The Cancer Research UK Biomolecular Structure Group, The School of Pharmacy, University of London, London, UK
| | | |
Collapse
|
174
|
Song G, Ren J. Recognition and regulation of unique nucleic acid structures by small molecules. Chem Commun (Camb) 2010; 46:7283-94. [DOI: 10.1039/c0cc01312a] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
175
|
Chen M, Song G, Wang C, Hu D, Ren J, Qu X. Small-molecule selectively recognizes human telomeric G-quadruplex DNA and regulates its conformational switch. Biophys J 2009; 97:2014-23. [PMID: 19804733 DOI: 10.1016/j.bpj.2009.07.025] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2009] [Revised: 06/30/2009] [Accepted: 07/13/2009] [Indexed: 01/08/2023] Open
Abstract
Structural complexity is an inherent feature of the human telomeric sequence, and it presents a major challenge for developing ligands of pharmaceutical interest. Recent studies have pointed out that the induction of a quadruplex or change of a quadruplex conformation on binding may be the most powerful method to exert the desired biological effect. In this study, we demonstrate a quadruplex ligand that binds selectively to different forms of the human telomeric G-quadruplex structure and regulates its conformational switch. The results show that not only can oxazine750 selectively induce parallel quadruplex formation from a random coil telomeric oligonucleotide in the absence of added cations, it also can easily surpass the energy barrier between two structures and change the G-quadruplex conformation in Na(+) or K(+) solution. The combination of its unique properties, including the size and shape of the G-quadruplex and the small molecule, is proposed as the predominant force for regulating the special structural formation and transitions. These results may stimulate the design of new quadruplex binders that would be capable of discriminating different G-quadruplex structures as well as controlling biological phenomena, functional molecules, and nanomaterials.
Collapse
Affiliation(s)
- Mingli Chen
- State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, People's Republic of China
| | | | | | | | | | | |
Collapse
|
176
|
McGuire R, McMillin DR. Steric effects direct the binding of porphyrins to tetramolecular quadruplex DNA. Chem Commun (Camb) 2009:7393-5. [PMID: 20024239 DOI: 10.1039/b919273e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The binding motifs of copper(II) porphyrins with G quadruplex DNA structures vary markedly depending on the steric demands of the ligand and the host structure.
Collapse
Affiliation(s)
- Robert McGuire
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084, USA
| | | |
Collapse
|
177
|
Webba da Silva M, Trajkovski M, Sannohe Y, Ma'ani Hessari N, Sugiyama H, Plavec J. Design of a G-Quadruplex Topology through Glycosidic Bond Angles. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200902454] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
178
|
Fogolari F, Haridas H, Corazza A, Viglino P, Corà D, Caselle M, Esposito G, Xodo LE. Molecular models for intrastrand DNA G-quadruplexes. BMC STRUCTURAL BIOLOGY 2009; 9:64. [PMID: 19811654 PMCID: PMC2768733 DOI: 10.1186/1472-6807-9-64] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2009] [Accepted: 10/07/2009] [Indexed: 11/10/2022]
Abstract
BACKGROUND Independent surveys of human gene promoter regions have demonstrated an overrepresentation of G(3)X(n1)G3X(n2)G(3)X(n3)G(3) motifs which are known to be capable of forming intrastrand quadruple helix structures. In spite of the widely recognized importance of G-quadruplex structures in gene regulation and growing interest around this unusual DNA structure, there are at present only few such structures available in the Nucleic Acid Database. In the present work we generate by molecular modeling feasible G-quadruplex structures which may be useful for interpretation of experimental data. RESULTS We have used all quadruplex DNA structures deposited in the Nucleic Acid Database in order to select a list of fragments entailing a strand of three adjacent G's paired with another strand of three adjacent G's separated by a loop of one to four residues. These fragments were further clustered and representative fragments were finally selected. Further fragments were generated by assemblying the two strands of each fragment with loops from different fragments whenever the anchor G's were superimposable. The fragments were used to assemble G quadruplex based on a superimposability criterion. CONCLUSION Molecular models have been generated for a large number of G(3)X(n1)G(3)X(n2)G3X(n3)G(3) sequences. For a given sequence not all topologies are possible with the available repertoire of fragments due to steric hindrance and low superimposability. Since all molecular models are generated by fragments coming from observed quadruplex structures, molecular models are in principle reliable and may be used for interpretation of experimental data. Some examples of applications are given.
Collapse
Affiliation(s)
- Federico Fogolari
- Dipartimento di Scienze e Tecnologie Biomediche, Università di Udine, Piazzale Kolbe 4 - 33100 Udine, Italy.
| | | | | | | | | | | | | | | |
Collapse
|
179
|
Dailey MM, Hait C, Holt PA, Maguire JM, Meier JB, Miller MC, Petraccone L, Trent JO. Structure-based drug design: from nucleic acid to membrane protein targets. Exp Mol Pathol 2009; 86:141-50. [PMID: 19454265 PMCID: PMC3143464 DOI: 10.1016/j.yexmp.2009.01.011] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2008] [Indexed: 01/08/2023]
Abstract
The in silico methods for drug discovery are becoming increasingly powerful and useful. That, in combination with increasing computer processor power, in our case using a novel distributed computing grid, has enabled us to greatly enhance our virtual screening efforts. Herein we review some of these efforts using both receptor and ligand-based virtual screening, with the goal of finding new anti-cancer agents. In particular, nucleic acids are a neglected set of targets, especially the different morphologies of duplex, triplex, and quadruplex DNA, many of which have increasing biological relevance. We also review examples of molecular modeling to understand receptors and using virtual screening against G-protein coupled receptor membrane proteins.
Collapse
Affiliation(s)
- Magdalena M Dailey
- Department of Chemistry, University of Louisville, Louisville, KY 40292, USA
| | | | | | | | | | | | | | | |
Collapse
|
180
|
Neidle S. The structures of quadruplex nucleic acids and their drug complexes. Curr Opin Struct Biol 2009; 19:239-50. [PMID: 19487118 DOI: 10.1016/j.sbi.2009.04.001] [Citation(s) in RCA: 353] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2009] [Accepted: 04/01/2009] [Indexed: 12/26/2022]
Abstract
Quadruplex nucleic acids are four-stranded structures formed from short tracts of G-rich sequence associating together. Their formation from eukaryotic telomeric DNA sequences is well established, at least in vitro, and has more recently been the focus of attention as novel anticancer targets since their formation inhibits the telomerase complex from maintaining telomere length in cancer cells. Structural studies have revealed a diversity of topologies for telomeric quadruplexes, which are sensitive to the nature of the cations present, to the flanking sequences, and probably also to concentration. The small number of structures determined for ligand-quadruplex complexes have to date shown a marked preference for the quadruplex component to have all strands in a parallel folding arrangement, which maximises the planar surface available for ligand binding. Informatics has revealed that there are a large number of quadruplex sequences present in human and other genomes, both eukaryotic and prokaryotic, with over-representation in upstream promoter regions. Structures for a few of these are now available, which emphasise the role played by loop sequences in determining fold.
Collapse
Affiliation(s)
- Stephen Neidle
- Cancer Research UK Biomolecular Structure Group, The School of Pharmacy, University of London, 29-39 Brunswick Square, London WC1N 1AX, UK.
| |
Collapse
|
181
|
Sannohe Y, Sato K, Matsugami A, Shinohara KI, Mashimo T, Katahira M, Sugiyama H. The orientation of the ends of G-quadruplex structures investigated using end-extended oligonucleotides. Bioorg Med Chem 2009; 17:1870-5. [PMID: 19223183 DOI: 10.1016/j.bmc.2009.01.051] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2008] [Revised: 01/21/2009] [Accepted: 01/22/2009] [Indexed: 01/03/2023]
Abstract
Human telomere DNA is of intense interest because of its role in the biology of both cancer and aging. The single-stranded telomere terminus can adopt the structure of a G-quadruplex, which is of particular important for anticancer drug discovery many researchers have reported various G-quadruplex structures in the human telomere. Although the human telomere consists of a number of tandem repeats, higher-order G-quadruplex structures are less discussed due to the complexity of the structures. Here we examined the orientation of the ends of the G-quadruplex structures with consideration given to higher-order structures. We prepared end-extended and (Br)G-substituted oligonucleotides. Native PAGE analysis, CD measurements and NMR spectroscopy showed that the ends of stable G-quadruplex structures point in opposite directions. Our results indicate that the human telomere DNA is likely to form rod-like higher-order structures. This may provide important information for understanding telomere structure and the development of telomere G-quadruplex-binding molecules as telomerase inhibitors.
Collapse
Affiliation(s)
- Yuta Sannohe
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo, Kyoto, Japan
| | | | | | | | | | | | | |
Collapse
|
182
|
Effects of the introduction of inversion of polarity sites in the quadruplex forming oligonucleotide TGGGT. Bioorg Med Chem 2009; 17:1997-2001. [PMID: 19217303 DOI: 10.1016/j.bmc.2009.01.027] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2008] [Revised: 01/13/2009] [Accepted: 01/14/2009] [Indexed: 11/23/2022]
Abstract
Insight into the influence of inversion of polarity sites on the structural features of quadruplex structures is presented. The NMR and CD studies concern modified oligodeoxynucleotides (ODNs) based on the quadruplex forming sequence TGGGT. The presence of inversion of polarity sites not only does not compromise the formation of quadruplexes, but in some cases it increases the thermal stability of modified complexes compared with that of the unmodified one.
Collapse
|
183
|
Folding topology of a bimolecular DNA quadruplex containing a stable mini-hairpin motif within the diagonal loop. J Mol Biol 2008; 385:1600-15. [PMID: 19070621 DOI: 10.1016/j.jmb.2008.11.050] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2008] [Revised: 11/12/2008] [Accepted: 11/20/2008] [Indexed: 11/24/2022]
Abstract
We describe the NMR structural characterisation of a bimolecular anti-parallel DNA quadruplex d(G(3)ACGTAGTG(3))(2) containing an autonomously stable mini-hairpin motif inserted within the diagonal loop. A folding topology is identified that is different from that observed for the analogous d(G(3)T(4)G(3))(2) dimer with the two structures differing in the relative orientation of the diagonal loops. This appears to reflect specific base stacking interactions at the quadruplex-duplex interface that are not present in the structure with the T(4)-loop sequence. A truncated version of the bimolecular quadruplex d(G(2)ACGTAGTG(2))(2), with only two core G-tetrads, is less stable and forms a heterogeneous mixture of three 2-fold symmetric quadruplexes with different loop arrangements. We demonstrate that the nature of the loop sequence, its ability to form autonomously stable structure, the relative stabilities of the hairpin loop and core quadruplex, and the ability to form favourable stacking interactions between these two motifs are important factors in controlling DNA G-quadruplex topology.
Collapse
|
184
|
Podbevsek P, Sket P, Plavec J. Stacking and not solely topology of T3 loops controls rigidity and ammonium ion movement within d(G4T3G4)2 G-quadruplex. J Am Chem Soc 2008; 130:14287-93. [PMID: 18834130 DOI: 10.1021/ja8048282] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A solution state NMR study has shown that d(G4T3G4) in the presence of (15)NH4(+) ions folds into a single bimolecular G-quadruplex structure in which its G-tracts are antiparallel and the two T3 loops span along the edges of the outer G-quartets on the opposite sides of the G-quadruplex core. This head-to-tail topology is in agreement with the topology of the G-quadruplex recently found in the X-ray crystal structure formed by d(G4T3G4) in the presence of K(+) ions [Neidle et al. J. Am. Chem. Soc. 2006, 128, 5480]. In contrast, the presence of K(+) ions in solution resulted in a complex ensemble of G-quadruplex structures. Molecular models based on NMR data demonstrate that thymine loop residues efficiently base-base stack on the outer G-quartets and in this way stabilize a single structure in the presence of (15)NH4(+) ions. The use of heteronuclear NMR enabled us to localize three (15)NH4(+) ion binding sites between pairs of adjacent G-quartets and study the kinetics of their movement. Interestingly, no (15)NH4(+) ion movement within the G-quadruplex was detected at 25 degrees C. At 35 degrees C we were able to observe slow movement of (15)NH4(+) ions from the outer binding sites to bulk solution with the characteristic residence lifetime of 1.2 s. The slow movement of (15)NH4(+) ions from the outer binding sites into bulk solution and the absence of movement from the inner binding site were attributed to steric hindrance imposed by the T3 loops and the rigidity of the G-quadruplex.
Collapse
Affiliation(s)
- Peter Podbevsek
- Slovenian NMR Center, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
| | | | | |
Collapse
|
185
|
Lane AN, Chaires JB, Gray RD, Trent JO. Stability and kinetics of G-quadruplex structures. Nucleic Acids Res 2008; 36:5482-515. [PMID: 18718931 PMCID: PMC2553573 DOI: 10.1093/nar/gkn517] [Citation(s) in RCA: 571] [Impact Index Per Article: 35.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2008] [Revised: 07/26/2008] [Accepted: 07/29/2008] [Indexed: 12/30/2022] Open
Abstract
In this review, we give an overview of recent literature on the structure and stability of unimolecular G-rich quadruplex structures that are relevant to drug design and for in vivo function. The unifying theme in this review is energetics. The thermodynamic stability of quadruplexes has not been studied in the same detail as DNA and RNA duplexes, and there are important differences in the balance of forces between these classes of folded oligonucleotides. We provide an overview of the principles of stability and where available the experimental data that report on these principles. Significant gaps in the literature have been identified, that should be filled by a systematic study of well-defined quadruplexes not only to provide the basic understanding of stability both for design purposes, but also as it relates to in vivo occurrence of quadruplexes. Techniques that are commonly applied to the determination of the structure, stability and folding are discussed in terms of information content and limitations. Quadruplex structures fold and unfold comparatively slowly, and DNA unwinding events associated with transcription and replication may be operating far from equilibrium. The kinetics of formation and resolution of quadruplexes, and methodologies are discussed in the context of stability and their possible biological occurrence.
Collapse
Affiliation(s)
- Andrew N Lane
- Structural Biology Program, JG Brown Cancer Center, University of Louisville, KY 40202, USA.
| | | | | | | |
Collapse
|
186
|
Hong Y, Häußler M, Lam J, Li Z, Sin K, Dong Y, Tong H, Liu J, Qin A, Renneberg R, Tang B. Label-Free Fluorescent Probing of G-Quadruplex Formation and Real-Time Monitoring of DNA Folding by a Quaternized Tetraphenylethene Salt with Aggregation-Induced Emission Characteristics. Chemistry 2008; 14:6428-37. [DOI: 10.1002/chem.200701723] [Citation(s) in RCA: 253] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
187
|
Johnson JE, Smith JS, Kozak ML, Johnson FB. In vivo veritas: using yeast to probe the biological functions of G-quadruplexes. Biochimie 2008; 90:1250-63. [PMID: 18331848 DOI: 10.1016/j.biochi.2008.02.013] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2007] [Accepted: 02/07/2008] [Indexed: 12/20/2022]
Abstract
Certain guanine-rich sequences are capable of forming higher order structures known as G-quadruplexes. Moreover, particular genomic regions in a number of highly divergent organisms are enriched for such sequences, raising the possibility that G-quadruplexes form in vivo and affect cellular processes. While G-quadruplexes have been rigorously studied in vitro, whether these structures actually form in vivo and what their roles might be in the context of the cell have remained largely unanswered questions. Recent studies suggest that G-quadruplexes participate in the regulation of such varied processes as telomere maintenance, transcriptional regulation and ribosome biogenesis. Here we review studies aimed at elucidating the in vivo functions of quadruplex structures, with a particular focus on findings in yeast. In addition, we discuss the utility of yeast model systems in the study of the cellular roles of G-quadruplexes.
Collapse
Affiliation(s)
- Jay E Johnson
- Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA
| | | | | | | |
Collapse
|