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Vardevanyan PO, Antonyan AP, Parsadanyan MA, Shahinyan MA, Petrosyan NH. Study of interaction of methylene blue with DNA and albumin. J Biomol Struct Dyn 2021; 40:7779-7785. [PMID: 33729082 DOI: 10.1080/07391102.2021.1902397] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The interaction of thiazine dye methylene blue (MB) with Calf thymus DNA and human blood serum albumin (HSA) has been studied. MB was revealed to stabilize the native structure of DNA and HSA, since the melting temperature of the complexes is shifted to higher values in relation to that of both macromolecules in pure state. It was also revealed that the absorption and fluorescence spectra of the MB-DNA complexes change significantly, while those of MB-albumin complexes do not change noticeably. Analysis of the obtained data allows to conclude that MB binds to DNA by two modes, including intercalation and electrostatic mechanisms. In the case of HSA, the main binding mode of MB, conditioning the stabilization of the protein native structure, is the electrostatic mechanism.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Poghos O Vardevanyan
- Faculty of Biology, Department of Biophysics, Yerevan State University, Yerevan, Armenia
| | - Ara P Antonyan
- Faculty of Biology, Department of Biophysics, Yerevan State University, Yerevan, Armenia
| | - Marine A Parsadanyan
- Faculty of Biology, Department of Biophysics, Yerevan State University, Yerevan, Armenia
| | - Mariam A Shahinyan
- Faculty of Biology, Department of Biophysics, Yerevan State University, Yerevan, Armenia
| | - Nara H Petrosyan
- Faculty of Biology, Department of Biophysics, Yerevan State University, Yerevan, Armenia
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2
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Vardevanyan PO, Parsadanyan MA, Antonyan AP, Shahinyan MA, Karapetyan AT. Spectroscopic study of interaction of various GC-content DNA with Hoechst 33258 depending on Na + concentration. J Biomol Struct Dyn 2020; 39:1519-1523. [PMID: 32066326 DOI: 10.1080/07391102.2020.1730244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Poghos O Vardevanyan
- Department of Biophysics, Faculty of Biology, Yerevan State University, Yerevan, Armenia
| | - Marine A Parsadanyan
- Department of Biophysics, Faculty of Biology, Yerevan State University, Yerevan, Armenia
| | - Ara P Antonyan
- Department of Biophysics, Faculty of Biology, Yerevan State University, Yerevan, Armenia
| | - Mariam A Shahinyan
- Department of Biophysics, Faculty of Biology, Yerevan State University, Yerevan, Armenia
| | - Armen T Karapetyan
- Department of Physics and Electrotecnics, National University of Architecture and Construction of Armenia, Yerevan, Armenia
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3
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Issar U, Kumari T, Arora R, Kakkar R. Conformational properties of DNA minor groove binder Hoechst 33258 in gas phase and in aqueous solution. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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4
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Barooah N, Mohanty J, Bhasikuttan AC. pH-Mediated Stoichiometric Switching of Cucurbit[8]uril–Hoechst-33258 Complexes. J Phys Chem B 2013; 117:13595-603. [DOI: 10.1021/jp405553g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Nilotpal Barooah
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Jyotirmayee Mohanty
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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5
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Ojha H, Murari BM, Anand S, Hassan MI, Ahmad F, Chaudhury NK. Interaction of DNA Minor Groove Binder Hoechst 33258 with Bovine Serum Albumin. Chem Pharm Bull (Tokyo) 2009; 57:481-6. [DOI: 10.1248/cpb.57.481] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Himanshu Ojha
- Division of Radiation Biosciences, Institute of Nuclear Medicine and Allied Sciences
| | | | - Sneh Anand
- Center for Biomedical Engineering, Indian Institute of Technology
| | | | - Faizan Ahmad
- Center for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia
| | - Nabo Kumar Chaudhury
- Division of Radiation Biosciences, Institute of Nuclear Medicine and Allied Sciences
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6
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Banerjee D, Pal SK. Ultrafast charge transfer and solvation of DNA minor groove binder: Hoechst 33258 in restricted environments. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.10.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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7
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Keller KM, Zhang J, Oehlers L, Brodbelt JS. Influence of initial charge state on fragmentation patterns for noncovalent drug/DNA duplex complexes. JOURNAL OF MASS SPECTROMETRY : JMS 2005; 40:1362-71. [PMID: 16220501 DOI: 10.1002/jms.927] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The charge state-dependent dissociation of various DNA duplexes and drug/duplex complexes has been investigated using collisionally activated dissociation (CAD) in a quadrupole ion trap mass spectrometer (QIT-MS). Several non-self-complementary 14-residue oligonucleotides were employed, in addition to an array of known DNA-interactive ligands, including the intercalators daunomycin and nogalamycin, as well as the minor groove binding agents distamycin, netropsin, 4',6-diamidino-2-phenylindole, and Hoechst 33342. In general, the dissociation pathways exhibited by both the duplexes and the drug/duplex complexes were found to be markedly sensitive to initial charge state. Time- and activation voltage-independent duplex strand separation predominated for higher charge states, which was interpreted to be a result of internal Coulombic repulsion or partial unzipping in the interface, while time- and activation voltage-dependent covalent cleavage predominated for lower charge states. The identity of the drug and the sequence of the duplex were both found to affect the competition between different dissociation processes. The dissociation pathways for the lower charge state complexes are probably more reflective of specific drug-DNA interactions because Coulombic and/or conformational effects are less marked for these precursors.
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Affiliation(s)
- Karin M Keller
- Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin TX 78712, USA
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8
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Alemán C, Namba AM, Casanovas J. Acid-Base and Electronic Structure-Dependent Properties of Hoechst 33342. J Biomol Struct Dyn 2005; 23:29-36. [PMID: 15918674 DOI: 10.1080/07391102.2005.10507044] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
An ab initio quantum mechanical study of the bis-benzimidazole derivative Hoechst 33342 is presented. Specifically, we report on the molecular geometry, proton affinity, gas-phase basicity, hydration, pKa, and molecular interaction potential map of Hoechst 33342 and the forms obtained by its protonation and deprotonation. Results have been compared with those obtained for Hoechst 33258 to analyze the influence of the chemical structure on the properties of this bis-benzimidazole derivative. Finally, the connection of some theoretical predictions with experimental evidences has been examined.
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Affiliation(s)
- Carlos Alemán
- Departament d'Enginyeria Quimica, E.T.S. d'Enginyeria Industrial de Barcelona, Universitat Politecnica de Catalunya, Barcelona E-08028, Spain.
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9
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Ladinig M, Leupin W, Meuwly M, Respondek M, Wirz J, Zoete V. Protonation Equilibria ofHoechst 33258 in Aqueous Solution. Helv Chim Acta 2005. [DOI: 10.1002/hlca.200490296] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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10
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Adhikary A, Buschmann V, Müller C, Sauer M. Ensemble and single-molecule fluorescence spectroscopic study of the binding modes of the bis-benzimidazole derivative Hoechst 33258 with DNA. Nucleic Acids Res 2003; 31:2178-86. [PMID: 12682368 PMCID: PMC153736 DOI: 10.1093/nar/gkg308] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Ensemble and single-molecule fluorescence measurements of 2'-(4-hydroxyphenyl)-5-[5-(4-methylpiperazine-1-yl) benzimidazo-2-yl]-benzimidazole (H-258)- calf thymus (CT) DNA complexes at various [H-258]/[DNA bp] ratios were performed to elucidate the binding of H-258 with DNA. Upon binding to double-stranded CT DNA (CT ds DNA) at a [H-258]/[DNA bp] ratio of 0.05 the relative fluorescence quantum yield, Phi(f), of H-258 increases from 0.02 to 0.58. The fluorescence decay can be fitted almost by a mono-exponential model with a lifetime of approximately 3.6 ns. This indicates that H-258 binds almost quantitatively in the minor groove of DNA at low [H-258]/[DNA bp] ratios. With increasing [H-258]/[DNA bp] ratios, e.g. 0.15 and 0.20, the fluorescence quantum yield of H-258 decreases to 0.28 and 0.19, respectively. Fitting of the fluorescence decays measured for higher [H-258]/[DNA bp] ratios reveals the presence of additional shorter fluorescence lifetime components in the range of 0.5-2.0 ns. Our results suggest that H-258 partially intercalates in G:C sequences at higher [H-258]/[DNA bp] ratios reflected by a lifetime component of 1.5-2 ns. In addition, stacking or adsorption of H-258 molecules on DNA occurs at higher [H-258]/[DNA bp] ratios. These molecules exhibit a short fluorescence lifetime of approximately 500 ps and are more exposed to the aqueous environment. Fluorescence transients of the intensity and lifetime of single H-258 CT ds DNA demonstrate that weakly (unspecific) bound H-258 molecules exhibit a shorter fluorescence lifetime and a strongly reduced photostability.
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Affiliation(s)
- Amitava Adhikary
- Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
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11
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Flader W, Wellenzohn B, Winger RH, Hallbrucker A, Mayer E, Liedl KR. Stepwise induced fit in the pico- to nanosecond time scale governs the complexation of the even-skipped transcriptional repressor homeodomain to DNA. Biopolymers 2003; 68:139-49. [PMID: 12548619 DOI: 10.1002/bip.10242] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Induced fit effects in the complex of a DNA decamer with two even-skipped transcriptional repressor homeodomain molecules were investigated by means of molecular dynamics simulations. Dynamics of these effects are found to be in the time scale from pico- to nanoseconds. First steps are made by the fast-moving DNA backbone phosphates, which upon binding change their B(I)/B(II) substate distribution. Further rearrangements in the DNA double helix induced upon complexation, like bending of the helix axis, changes of the minor groove width, and of different helical parameters, are slower and occur within a few nanoseconds. The flexibility of the DNA, especially of its backbone, seems thereby to play an important role for specific DNA ligand recognition.
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Affiliation(s)
- Wolfgang Flader
- Institute of General, Inorganic and Theoretical Chemistry University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
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12
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Alemán C, Adhikary A, Zanuy D, Casanovas J. On the protonation equilibrium for the benzimidazole derivative Hoechst 33258: an electronic molecular orbital study. J Biomol Struct Dyn 2002; 20:301-10. [PMID: 12354081 DOI: 10.1080/07391102.2002.10506845] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Hoechst 33258 and its deprotonated forms have been examined in the gas-phase and in solution using quantum mechanical methods. Ab initio calculations at the HF level have been used to investigate the more relevant geometrical trends of such species, while proton affinities and gas-phase basicities were derived from B3LYP and MP2 electronic energies. Solvation energies were calculated using a dielectric continuum model: MST. The Delta(p)K(a) values were estimated by combining the gas-phase basicities and the free energies of solvation. Comparison of these Delta(p)K(a) values with experimentally reported data have been used to highlight the advantages and limitations of this strategy.
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Affiliation(s)
- Carlos Alemán
- Departament d'Enginyeria Química, E.T.S. d'Enginyers Industrials de Barcelona, Universitat Politècnica de Catalunya, Diagonal 647, Barcelona E-08028, Spain.
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13
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Utsuno K, Tsuboi M, Katsumata S, Iwamoto T. Visualization of complexes of Hoechst 33258 and DNA duplexes in solution by atomic force microscopy. Chem Pharm Bull (Tokyo) 2002; 50:216-9. [PMID: 11848212 DOI: 10.1248/cpb.50.216] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Tertiary structure changes in DNA duplexes, induced by Hoechst 33258 binding, have been examined by the use of atomic force microscopy. Besides minor groove binding, which is an established mode of binding for this drug, Hoechst 33258 has now been found to show another binding mode, which causes an unwinding of the duplex. When the drug concentration is as high as 0.5 microg/ml, the Hoechst 33258 molecule seems to function as a clamp for two DNA chains and forms a condensate. The condensate was found to have a toroidal shape. By surveying more than 100 microscopic images of such condensates formed in I microg/ml drug solution, a mechanism of toroidal condensate formation has been proposed.
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Affiliation(s)
- Kuniharu Utsuno
- High-Tech Research Center, College of Science and Engineering, Iwaki Meisei University, Fukushima, Japan
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14
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Flader W, Wellenzohn B, Winger RH, Hallbrucker A, Mayer E, Liedl KR. BI ⇌ BII Substate Transitions Induce Changes in the Hydration of B-DNA, Potentially Mediating Signal Transduction from the Minor to Major Groove. J Phys Chem B 2001. [DOI: 10.1021/jp004046q] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Wolfgang Flader
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Bernd Wellenzohn
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Rudolf H. Winger
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Andreas Hallbrucker
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Erwin Mayer
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Klaus R. Liedl
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
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15
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Wellenzohn B, Flader W, Winger RH, Hallbrucker A, Mayer E, Liedl KR. Significance of ligand tails for interaction with the minor groove of B-DNA. Biophys J 2001; 81:1588-99. [PMID: 11509372 PMCID: PMC1301637 DOI: 10.1016/s0006-3495(01)75813-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Minor groove binding ligands are of great interest due to their extraordinary importance as transcription controlling drugs. We performed three molecular dynamics simulations of the unbound d(CGCGAATTCGCG)(2) dodecamer and its complexes with Hoechst33258 and Netropsin. The structural behavior of the piperazine tail of Hoechst33258, which has already been shown to be a contributor in sequence-specific recognition, was analyzed. The simulations also reveal that the tails of the ligands are able to influence the width of the minor groove. The groove width is even sensitive for conformational transitions of these tails, indicating a high adaptability of the minor groove. Furthermore, the ligands also exert an influence on the B(I)/B(II) backbone conformational substate behavior. All together these results are important for the understanding of the binding process of sequence-specific ligands.
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Affiliation(s)
- B Wellenzohn
- Institute of General, Inorganic, and Theoretical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria
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16
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Breusegem SY, Sadat-Ebrahimi SE, Douglas KT, Clegg RM, Loontiens FG. Increased stability and lifetime of the complex formed between DNA and meta-phenyl-substituted Hoechst dyes as studied by fluorescence titrations and stopped-flow kinetics. J Mol Biol 2001; 308:649-63. [PMID: 11350167 DOI: 10.1006/jmbi.2001.4615] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The large increase in fluorescence upon binding of five para- and meta-phenyl substituted hydroxy and methoxy derivatives of the Hoechst dye with poly[d(A-T)], d(CGCGAATTCGCG)2, and its corresponding T4-looped 28-mer hairpin was used to monitor the binding by equilibrium titrations and by stopped-flow kinetics. The affinity increases in the same order for the three DNAs: p-OH<m-OCH3, p-OH<m-OH<m-OH, p-OCH3<bis-m-OH. The association constants K(a) are three to 11 times larger for the AATT site than for poly[d(A-T)]. The AATT site binds m-OH Hoechst with K(a)=3.8 x 10(9 )M(-1) and bis-m-OH Hoechst with K(a)=1.9 x 10(10 )M(-1), which are seven and 37 times higher than p-OH Hoechst (Hoechst 33258), respectively. The high K(a )values determined at equilibrium agree with the kinetically defined association constants K(kin)=k(on)/k(off). The association-rate parameters k(on) were obtained by stopped-flow kinetics and the dissociation-rate parameters k(off) by dissociation kinetics using poly[d(A-5BrU)]. For binding to the AATT site, k(on) values are similar and nearly diffusion-controlled (2.0 x 10(8) M(-1) x s(-1) to 2.9 x 10(8) M(-1) x s(-1)), while k(off) values (0.42 s(-1) to 0.012 s(-1)) depend on the phenyl substitution and determine the affinity. At the AATT site, the longest-living complex is formed when the dye carries a bis-m-OH phenyl group that probably integrates in a hydrogen-bonding network of water molecules. With poly(dA).poly(dT), poly[d(A-T)] and poly[d(A-5BrU)], k(on) (between 6.1 x 10(7) M(-1) x s(-1) and 5.2 x 10(8) M(-1) x s(-1)) depends on the DNA.
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Affiliation(s)
- S Y Breusegem
- Laboratory for Biochemistry Department of Biochemistry Physiology and Microbiology Faculty of Sciences, Ghent University, Ledeganckstraat, Gent, B-9000, Belgium
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Wellenzohn B, Flader W, Winger RH, Hallbrucker A, Mayer E, Liedl KR. Complex of B-DNA with polyamides freezes DNA backbone flexibility. J Am Chem Soc 2001; 123:5044-9. [PMID: 11457333 DOI: 10.1021/ja003639b] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The development of sequence-specific minor groove binding ligands is a modern and rapidly growing field of research because of their extraordinary importance as transcription-controlling drugs. We performed three molecular dynamics simulations in order to clarify the influence of minor groove binding of two ImHpPyPy-beta-Dp polyamides to the d(CCAGTACTGG)(2) decamer in the B-form. This decamer contains the recognition sequence for the trp repressor (5'-GTACT-3'), and it was investigated recently by X-ray crystallography. On one hand we are able to reproduce X-ray-determined DNA--drug contacts, and on the other hand we provide new contact information which is important for the development of potential ligands. The new insights show how the beta-tail of the polyamide ligands contributes to binding. Our simulations also indicate that complexation freezes the DNA backbone in a specific B(I) or B(II) substate conformation and thus optimizes nonbonded contacts. The existence of this distinct B(I)/B(II) substate pattern also allows the formation of water-mediated contacts. Thus, we suggest the B(I) <==> B(II) substate behavior to be an important part of the indirect readout of DNA.
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Affiliation(s)
- B Wellenzohn
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
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18
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Satz AL, Bruice TC. Synthesis of fluorescent microgonotropens (FMGTs) and their interactions with dsDNA. Bioorg Med Chem 2000; 8:1871-80. [PMID: 11003131 DOI: 10.1016/s0968-0896(00)00116-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A new class of microgonotropen compounds (FIMGTs), which fluoresce upon binding to dsDNA, is introduced. The FMGTs consist of a minor groove binding moiety based upon Hoescht 33258 covalently attached to a polyamine chain capable of interacting with the phosphodiester backbone of dsDNA. The interactions of FMGTs with dsDNA were investigated by fluorescence and UV spectroscopy. Several different dsDNA oligomers were studied to determine the effect of binding site sequence on stoichiometric and binding affinity. The FMGTs were found to bind a dsDNA oligomer that contained the sequence 5'-AATTT-3' with FMGT:dsDNA stoichiometrics equal to 2:1 or 3:1. Hoechst 33258 bound the same dsDNA oligomer with a 1:1 stoichiometry. The second and third order equilibrium constants for complexation were determined to be Log(K1K2) = 17.9 M(-2) and Log(K1K2K3) = 26.1 M(-3), respectively, for two of strongest binding FMGTs. From thermal melting experiments deltaTm for Hoechst 33258 was determined to be 10 degrees C while the deltaTm values for FMGTs ranged from 20-26 degrees C indicating the greater stability of the latter.
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Affiliation(s)
- A L Satz
- Department of Chemistry, University of California at Santa Barbara, 93106, USA
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19
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Wellenzohn B, Winger RH, Hallbrucker A, Mayer E, Liedl KR. Simulation of EcoRI Dodecamer Netropsin Complex Confirms Class I Complexation Mode. J Am Chem Soc 2000. [DOI: 10.1021/ja993759n] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bernd Wellenzohn
- Contribution from the Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Rudolf H. Winger
- Contribution from the Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Andreas Hallbrucker
- Contribution from the Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Erwin Mayer
- Contribution from the Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Klaus R. Liedl
- Contribution from the Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
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20
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Satz AL, Bruice TC. Synthesis of a fluorescent microgonotropen (FMGT-1) and its interactions with the dodecamer d(CCGGAATTCCGG). Bioorg Med Chem Lett 1999; 9:3261-6. [PMID: 10612581 DOI: 10.1016/s0960-894x(99)00599-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A new type of microgonotropen that fluoresces upon binding to dsDNA has been synthesized. FMGT-1, an analogue of the minor groove binder Hoechst 33258, is functionalized with a polyamine chain capable of interacting with the phosphate backbone of DNA. Binding studies indicate that FMGT-1 binds more tightly to dsDNA than the parent compound Hoechst 33258.
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Affiliation(s)
- A L Satz
- Department of Chemistry, University of California, Santa Barbara 93106, USA
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21
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Reinert KE. DNA multimode interaction with berenil and pentamidine; double helix stiffening, unbending and bending. J Biomol Struct Dyn 1999; 17:311-31. [PMID: 10563581 DOI: 10.1080/07391102.1999.10508364] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The antitrypanosomal drugs berenil (Ber) and pentamidine (Pm) preferentially bind to DNA in the minor groove of A.T-rich domains. The properties of A.T clusters are essential for sequence-mediated helix bending. Groove binding drugs locally stiffen the DNA helix but may also change intrinsic helix bends or may bend straight DNA. Ligand binding to randomly distributed sites alters the apparent DNA persistence length, a. Criteria permit the distinction of the underlying mechanism(s). Helix bends, if phased with the helix screw, however, generate solenoidal superhelix components mediating an apparent change of the hydrodynamically effective DNA contour length, L. The measurement of relative changes of both, a and L, as induced by Ber or Pm is performed by titration rotational viscometry. The determination of the two quantities requires two independent measurements: the relative change of DNA intrinsic viscosity, deltay, for short (tending to rod-like) DNA molecules and for comparably long (almost coil-like) ones as a function of r, the bound drug molecules per DNA-P, and this under conditions effectively excluding intramolecular DNA-DNA crosslinking effects. At least at r< or =0.05 and < or =0.03, respectively, the two drugs virtually bind completely to a eukaryotic DNA. r ranges of different drug binding strength and, concomitantly, of different specific conformational response, could be resolved. They represent (sub)modes of different DNA sequences... Whereas the mode-specific elongation effects are fairly similar for both systems, there are pronounced quantitative differences in the relative change of DNA persistence length. The sites of highest Ber-binding strength are correlated to unbent alternating helical A.T segments followed by bent and by less bent or unbent dAn.dTn tracts straightened on Ber-binding. For Pm-DNA interaction the ligand bends the sites of highest Pm affinity. Generally, ligand induced and sequence mediated local DNA-bend removal or DNA bending, as observed for several modes of interaction with A.T rich DNA, are considered to be of gene regulatory relevance.
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Affiliation(s)
- K E Reinert
- Institute for Molecular Biology, Friedrich-Schiller-University, Jena, Germany
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