1
|
Raffaini G. Adsorption and Self-Aggregation of Chiral [5]-Aza[6]helicenes on DNA Architecture: A Molecular Dynamics Study. J Phys Chem B 2023; 127:8285-8295. [PMID: 37751596 PMCID: PMC10561140 DOI: 10.1021/acs.jpcb.3c02487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 09/02/2023] [Indexed: 09/28/2023]
Abstract
Helicenes are an extremely interesting class of conjugated molecules without asymmetric carbon atoms but with intrinsic chirality. These molecules can interact with double-stranded chiral B-DNA architecture, modifying after their adsorption the hydrophilicity exposed by DNA to the biological environment. They also form ordered structures due to self-aggregation processes with possible different light emissions. Following initial studies based on molecular mechanics (MM) and molecular dynamics (MD) simulations regarding the adsorption and self-aggregation process of 5-aza[5]helicenes on double-stranded B-DNA, this theoretical work investigates the interaction between (M)- and (P)-5-aza[6]helicenes with double-helix DNA. Initially, the interaction of the pure single enantiomer with DNA is studied. Possible preferential absorption in minor or major grooves can occur. Afterward, the interaction of enantiopure compounds (M)- and (P)-5-aza[6]helicenes, potentially occurring in a racemic mixture at different concentrations, was investigated, taking into consideration both competitive adsorption on DNA and the possible helicenes' self-aggregation process. The structural selectivity of DNA binding and the role of helicene concentration in adsorption and the self-aggregation process are interesting. In addition, the ability to form ordered structures on DNA that follow its chiral architecture, thanks to favorable van der Waals intermolecular interactions, is curious.
Collapse
Affiliation(s)
- Giuseppina Raffaini
- Department
of Chemistry, Materials, and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza L. Da Vinci 32, 20131 Milano, Italy
- INSTM,
National Consortium of Materials Science and Technology, Local Unit Politecnico di Milano, 20131 Milano, Italy
| |
Collapse
|
2
|
Seedorf T, Kirschning A, Solga D. Natural and Synthetic Oligoarylamides: Privileged Structures for Medical Applications. Chemistry 2021; 27:7321-7339. [PMID: 33481284 PMCID: PMC8251530 DOI: 10.1002/chem.202005086] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Indexed: 12/13/2022]
Abstract
The term "privileged structure" refers to a single molecular substructure or scaffold that can serve as a starting point for high-affinity ligands for more than one receptor type. In this report, a hitherto overlooked group of privileged substructures is addressed, namely aromatic oligoamides, for which there are natural models in the form of cystobactamids, albicidin, distamycin A, netropsin, and others. The aromatic and heteroaromatic core, together with a flexible selection of substituents, form conformationally well-defined scaffolds capable of specifically binding to conformationally well-defined regions of biomacromolecules such as helices in proteins or DNA often by acting as helices mimics themselves. As such, these aromatic oligoamides have already been employed to inhibit protein-protein and nucleic acid-protein interactions. This article is the first to bring together the scattered knowledge about aromatic oligoamides in connection with biomedical applications.
Collapse
Affiliation(s)
- Tim Seedorf
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum, (BMWZ)Leibniz Universität HannoverSchneiderberg 1B30167HannoverGermany
| | - Andreas Kirschning
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum, (BMWZ)Leibniz Universität HannoverSchneiderberg 1B30167HannoverGermany
| | - Danny Solga
- Institut für Organische Chemie und Biomolekulares Wirkstoffzentrum, (BMWZ)Leibniz Universität HannoverSchneiderberg 1B30167HannoverGermany
| |
Collapse
|
3
|
Raffaini G, Mele A, Caronna T. Adsorption of Chiral [5]-Aza[5]helicenes on DNA Can Modify Its Hydrophilicity and Affect Its Chiral Architecture: A Molecular Dynamics Study. MATERIALS 2020; 13:ma13215031. [PMID: 33171884 PMCID: PMC7664699 DOI: 10.3390/ma13215031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 11/03/2020] [Accepted: 11/04/2020] [Indexed: 12/17/2022]
Abstract
Helicenes are interesting chiral molecules without asymmetric carbon atoms but with intrinsic chirality. Functionalized 5-Aza[5]helicenes can form non-covalent complexes with anticancer drugs and therefore be potential carriers. The paper highlights the different structural selectivity for DNA binding for two enantiopure compounds and the influence of concentration on their adsorption and self-aggregation process. In this theoretical study based on atomistic molecular dynamics simulations the interaction between (M)- and (P)-5-Aza[5]helicenes with double helix B-DNA is investigated. At first the interaction of single pure enantiomer with DNA is studied, in order to find the preferred site of interaction at the major or minor groove. Afterwards, the interaction of the enantiomers at different concentrations was investigated considering both competitive adsorption on DNA and possible helicenes self-aggregation. Therefore, racemic mixtures were studied. The helicenes studied are able to bind DNA modulating or locally modifying its hydrophilic surface into hydrophobic after adsorption of the first helicene layer partially covering the negative charge of DNA at high concentration. The (P)-enantiomer shows a preferential binding affinity of DNA helical structure even during competitive adsorption in the racemic mixtures. These DNA/helicenes non-covalent complexes exhibit a more hydrophobic exposed surface and after self-aggregation a partially hidden DNA chiral architecture to the biological environment.
Collapse
Affiliation(s)
- Giuseppina Raffaini
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza L. Da Vinci 32, 20131 Milano, Italy;
- INSTM, National Consortium of Materials Science and Technology, Local Unit Politecnico di Milano, 20131 Milano, Italy
- Correspondence:
| | - Andrea Mele
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza L. Da Vinci 32, 20131 Milano, Italy;
| | - Tullio Caronna
- Dipartimento di Ingegneria e Scienze Applicate, Università degli Studi di Bergamo, 24044 Bergamo, Italy;
| |
Collapse
|
4
|
Effects of Pyrrole-Imidazole Polyamides Targeting Human TGF-β1 on the Malignant Phenotypes of Liver Cancer Cells. Molecules 2020; 25:molecules25122883. [PMID: 32585841 PMCID: PMC7356887 DOI: 10.3390/molecules25122883] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 06/12/2020] [Accepted: 06/20/2020] [Indexed: 02/06/2023] Open
Abstract
Synthetic pyrrole-imidazole (PI) polyamides bind to the minor groove of double-helical DNA with high affinity and specificity, and inhibit the transcription of corresponding genes. In liver cancer, transforming growth factor (TGF)-β expression is correlated with tumor grade, and high-grade liver cancer tissues express epithelial-mesenchymal transition markers. TGF-β1 was reported to be involved in cancer development by transforming precancer cells to cancer stem cells (CSCs). This study aimed to evaluate the effects of TGF-β1-targeting PI polyamide on the growth of liver cancer cells and CSCs and their TGF-β1 expression. We analyzed TGF-β1 expression level after the administration of GB1101, a PI polyamide that targets human TGF-β1 promoter, and examined its effects on cell proliferation, invasiveness, and TGF-β1 mRNA expression level. GB1101 treatment dose-dependently decreased TGF-β1 mRNA levels in HepG2 and HLF cells, and inhibited HepG2 colony formation associated with downregulation of TGF-β1 mRNA. Although GB1101 did not substantially inhibit the proliferation of HepG2 cells compared to untreated control cells, GB1101 significantly suppressed the invasion of HLF cells, which displayed high expression of CD44, a marker for CSCs. Furthermore, GB1101 significantly inhibited HLF cell sphere formation by inhibiting TGF-β1 expression, in addition to suppressing the proliferation of HLE and HLF cells. Taken together, GB1101 reduced TGF-β1 expression in liver cancer cells and suppressed cell invasion; therefore, GB1101 is a novel candidate drug for the treatment of liver cancer.
Collapse
|
5
|
Zhao X, Guo S, Lu C, Chen J, Le S, Fu H, Yan J. Single-molecule manipulation quantification of site-specific DNA binding. Curr Opin Chem Biol 2019; 53:106-117. [DOI: 10.1016/j.cbpa.2019.08.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 07/24/2019] [Accepted: 08/24/2019] [Indexed: 10/25/2022]
|
6
|
Lambert M, Jambon S, Depauw S, David-Cordonnier MH. Targeting Transcription Factors for Cancer Treatment. Molecules 2018; 23:molecules23061479. [PMID: 29921764 PMCID: PMC6100431 DOI: 10.3390/molecules23061479] [Citation(s) in RCA: 229] [Impact Index Per Article: 38.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 06/11/2018] [Accepted: 06/15/2018] [Indexed: 12/15/2022] Open
Abstract
Transcription factors are involved in a large number of human diseases such as cancers for which they account for about 20% of all oncogenes identified so far. For long time, with the exception of ligand-inducible nuclear receptors, transcription factors were considered as “undruggable” targets. Advances knowledge of these transcription factors, in terms of structure, function (expression, degradation, interaction with co-factors and other proteins) and the dynamics of their mode of binding to DNA has changed this postulate and paved the way for new therapies targeted against transcription factors. Here, we discuss various ways to target transcription factors in cancer models: by modulating their expression or degradation, by blocking protein/protein interactions, by targeting the transcription factor itself to prevent its DNA binding either through a binding pocket or at the DNA-interacting site, some of these inhibitors being currently used or evaluated for cancer treatment. Such different targeting of transcription factors by small molecules is facilitated by modern chemistry developing a wide variety of original molecules designed to specifically abort transcription factor and by an increased knowledge of their pathological implication through the use of new technologies in order to make it possible to improve therapeutic control of transcription factor oncogenic functions.
Collapse
Affiliation(s)
- Mélanie Lambert
- INSERM UMR-S1172-JPARC (Jean-Pierre Aubert Research Center), Lille University and Hospital Center (CHU-Lille), Institut pour la Recherche sur le Cancer de Lille (IRCL), Place de Verdun, F-59045 Lille, France.
| | - Samy Jambon
- INSERM UMR-S1172-JPARC (Jean-Pierre Aubert Research Center), Lille University and Hospital Center (CHU-Lille), Institut pour la Recherche sur le Cancer de Lille (IRCL), Place de Verdun, F-59045 Lille, France.
| | - Sabine Depauw
- INSERM UMR-S1172-JPARC (Jean-Pierre Aubert Research Center), Lille University and Hospital Center (CHU-Lille), Institut pour la Recherche sur le Cancer de Lille (IRCL), Place de Verdun, F-59045 Lille, France.
| | - Marie-Hélène David-Cordonnier
- INSERM UMR-S1172-JPARC (Jean-Pierre Aubert Research Center), Lille University and Hospital Center (CHU-Lille), Institut pour la Recherche sur le Cancer de Lille (IRCL), Place de Verdun, F-59045 Lille, France.
| |
Collapse
|
7
|
Igarashi J, Fukuda N, Inoue T, Nakai S, Saito K, Fujiwara K, Matsuda H, Ueno T, Matsumoto Y, Watanabe T, Nagase H, Bando T, Sugiyama H, Itoh T, Soma M. Preclinical Study of Novel Gene Silencer Pyrrole-Imidazole Polyamide Targeting Human TGF-β1 Promoter for Hypertrophic Scars in a Common Marmoset Primate Model. PLoS One 2015; 10:e0125295. [PMID: 25938472 PMCID: PMC4418757 DOI: 10.1371/journal.pone.0125295] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2014] [Accepted: 03/09/2015] [Indexed: 11/18/2022] Open
Abstract
We report a preclinical study of a pyrrole-imidazole (PI) polyamide that targets the human transforming growth factor (hTGF)-β1 gene as a novel transcriptional gene silencer in a common marmoset primate model. We designed and then synthesized PI polyamides to target the hTGF-β1 promoter. We examined effects of seven PI polyamides (GB1101-1107) on the expression of hTGF-β1 mRNA stimulated with phorbol 12-myristate 13-acetate (PMA) in human vascular smooth muscle cells. GB1101, GB1105 and GB1106 significantly inhibited hTGF-β1 mRNA expression. We examined GB1101 as a PI polyamide to hTGF-β1 for hypertrophic scars in marmosets in vivo. Injection of GB1101 completely inhibited hypertrophic scar formation at 35 days post-incision and inhibited cellular infiltration, TGF-β1 and vimentin staining, and epidermal thickness. Mismatch polyamide did not affect hypertrophic scarring or histological changes. Epidermis was significantly thinner with GB1101 than with water and mismatch PI polyamides. We developed the PI polyamides for practical ointment medicines for the treatment of hypertrophic scars. FITC-labeled GB1101 with solbase most efficiently distributed in the nuclei of epidermal keratinocytes, completely suppressed hypertropic scarring at 42 days after incision, and considerably inhibited epidermal thickness and vimentin-positive fibroblasts. PI polyamides targeting hTGF-β1 promoter with solbase ointment will be practical medicines for treating hypertrophic scars after surgical operations and skin burns.
Collapse
Affiliation(s)
- Jun Igarashi
- Department of General Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Noboru Fukuda
- Division of Life Science, Advanced Research Institute for the Sciences and Humanities, Nihon University Graduate School, Tokyo, Japan
- Division of Nephrology Hypertension and Endocrinology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan
- * E-mail:
| | - Takashi Inoue
- Marmoset Research Department, Central Institute for Experimental Animals, Kanagawa, Japan
| | - Shigeki Nakai
- Department of General Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Kosuke Saito
- Department of General Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Kyoko Fujiwara
- Department of General Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Hiroyuki Matsuda
- Department of General Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Takahiro Ueno
- Division of Nephrology Hypertension and Endocrinology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Yoshiaki Matsumoto
- Department of Clinical Pharmacokinetics, College of Pharmacy, Nihon University, Chiba, Japan
| | - Takayoshi Watanabe
- Department of Cancer Genetics, Chiba Cancer Center Research Institute, Chiba, Japan
| | - Hiroki Nagase
- Department of Cancer Genetics, Chiba Cancer Center Research Institute, Chiba, Japan
| | - Toshikazu Bando
- Department of Chemistry, Kyoto University Graduate School, Kyoto, Japan
| | - Hiroshi Sugiyama
- Department of Chemistry, Kyoto University Graduate School, Kyoto, Japan
| | - Toshio Itoh
- Marmoset Research Department, Central Institute for Experimental Animals, Kanagawa, Japan
| | - Masayoshi Soma
- Department of General Medicine, Nihon University School of Medicine, Tokyo, Japan
- Division of Nephrology Hypertension and Endocrinology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan
| |
Collapse
|
8
|
Selective recognition of viral promoters by host cell transcription complexes: challenges and opportunities to control latency. Curr Opin Virol 2013; 3:380-6. [PMID: 23827503 DOI: 10.1016/j.coviro.2013.06.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2013] [Revised: 06/07/2013] [Accepted: 06/10/2013] [Indexed: 12/15/2022]
Abstract
The rate of transcription driven by the HIV promoter defines both the entry into and reactivation from viral latency. The HIV core promoter plays a pivotal role in HIV latency by recruiting host cell RNA polymerase II pre-initiation complexes essential for viral transcription. Pioneering studies on the HIV core promoter revealed that the architecture of the HIV core promoter is specifically required for the amplification of transcription in response to the viral trans-activator Tat, and provided the proof-of-concept that the HIV core promoter represents a tractable drug target. The recent discovery of host cell transcription complexes that selectively recognize the HIV core promoter provides new impetus to investigate their components as novel targets to therapeutically extinguish or eradicate latent HIV.
Collapse
|
9
|
Blackledge MS, Melander C. Programmable DNA-binding small molecules. Bioorg Med Chem 2013; 21:6101-14. [PMID: 23665141 DOI: 10.1016/j.bmc.2013.04.023] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 03/29/2013] [Accepted: 04/05/2013] [Indexed: 10/26/2022]
Abstract
Aberrant gene expression is responsible for a myriad of human diseases from infectious diseases to cancer. Precise regulation of these genes via specific interactions with the DNA double helix could pave the way for novel therapeutics. Pyrrole-imidazole polyamides are small molecules capable of binding to pre-determined DNA sequences up to 16 base pairs with affinity and specificity comparable to natural transcription factors. In the three decades since their development, great strides have been made relating to synthetic accessibility and improved sequence specificity and binding affinity. This perspective presents a brief history of early seminal developments in the field and highlights recent reports of the utility of polyamides as both genetic modulators and molecular probes.
Collapse
Affiliation(s)
- Meghan S Blackledge
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8024, United States
| | | |
Collapse
|
10
|
Bashkin JK, Aston K, Ramos JP, Koeller KJ, Nanjunda R, He G, Dupureur CM, David Wilson W. Promoter scanning of the human COX-2 gene with 8-ring polyamides: unexpected weakening of polyamide-DNA binding and selectivity by replacing an internal N-Me-pyrrole with β-alanine. Biochimie 2012; 95:271-9. [PMID: 23023196 DOI: 10.1016/j.biochi.2012.09.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Accepted: 09/18/2012] [Indexed: 12/16/2022]
Abstract
Rules for polyamide-DNA recognition have proved invaluable for the design of sequence-selective DNA binding agents in cell-free systems. However, these rules are not fully transferrable to predicting activity in cells, tissues or animals, and additional refinements to our understanding of DNA recognition would help biomedical studies. Similar complexities are encountered when using internal β-alanines as polyamide building blocks in place of N-methylpyrrole; β-alanines were introduced in polyamide designs to maintain good hydrogen bonding registry with the target DNA, especially for long polyamides or those with several GC bp (P.B. Dervan, A.R. Urbach, Essays Contemp. Chem. (2001) 327-339). Thus, to clarify important subtleties of molecular recognition, we studied the effects of replacing a single pyrrole with β-alanine in 8-ring polyamides designed against the Ets-1 transcription factor. Replacement of a single internal N-methylpyrrole with β-alanine to generate a β/Im pairing in two 8-ring polyamides causes a decrease in DNA binding affinity by two orders of magnitude and decreases DNA binding selectivity, contrary to expectations based on the literature. Measurements were made by fluorescence spectroscopy, quantitative DNA footprinting and surface plasmon resonance, with these vastly different techniques showing excellent agreement. Furthermore, results were validated for a range of DNA substrates from small hairpins to long dsDNA sequences. Docking studies helped show that β-alanine does not make efficient hydrophobic contacts with the rest of the polyamide or nearby DNA, in contrast to pyrrole. These results help refine design principles and expectations for polyamide-DNA recognition.
Collapse
Affiliation(s)
- James K Bashkin
- Department of Chemistry & Biochemistry, Center for Nanoscience, University of Missouri-St. Louis, One University Blvd., St. Louis, MO 63121, USA.
| | | | | | | | | | | | | | | |
Collapse
|
11
|
Wilhelm E, Doyle MC, Nzaramba I, Magdzinski A, Dumais N, Bell B. CTGC motifs within the HIV core promoter specify Tat-responsive pre-initiation complexes. Retrovirology 2012; 9:62. [PMID: 22834489 PMCID: PMC3419132 DOI: 10.1186/1742-4690-9-62] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 07/26/2012] [Indexed: 12/12/2022] Open
Abstract
Background HIV latency is an obstacle for the eradication of HIV from infected individuals. Stable post-integration latency is controlled principally at the level of transcription. The HIV trans-activating protein, Tat, plays a key function in enhancing HIV transcriptional elongation. The HIV core promoter is specifically required for Tat-mediated trans-activation of HIV transcription. In addition, the HIV core promoter has been shown to be a potential anti-HIV drug target. Despite the pivotal role of the HIV core promoter in the control of HIV gene expression, the molecular mechanisms that couple Tat function specifically to the HIV core promoter remain unknown. Results Using electrophoretic mobility shift assays (EMSAs), the TATA box and adjacent sequences of HIV essential for Tat trans-activation were shown to form specific complexes with nuclear extracts from peripheral blood mononuclear cells, as well as from HeLa cells. These complexes, termed pre-initiation complexes of HIV (PICH), were distinct in composition and DNA binding specificity from those of prototypical eukaryotic TATA box regions such as Adenovirus major late promoter (AdMLP) or the hsp70 promoter. PICH contained basal transcription factors including TATA-binding protein and TFIIA. A mutational analysis revealed that CTGC motifs flanking the HIV TATA box are required for Tat trans-activation in living cells and correct PICH formation in vitro. The binding of known core promoter binding proteins AP-4 and USF-1 was found to be dispensable for Tat function. TAR RNA prevented stable binding of PICH-2, a complex that contains the general transcription factor TFIIA, to the HIV core promoter. The impact of TAR on PICH-2 specifically required its bulge sequence that is also known to interact with Tat. Conclusion Our data reveal that CTGC DNA motifs flanking the HIV TATA box are required for correct formation of specific pre-initiation complexes in vitro and that these motifs are also required for Tat trans-activation in living cells. The impact of TAR RNA on PICH-2 stability provides a mechanistic link by which pre-initiation complex dynamics could be coupled to the formation of the nascent transcript by the elongating transcription complex. Together, these findings shed new light on the mechanisms by which the HIV core promoter specifically responds to Tat to activate HIV gene expression.
Collapse
Affiliation(s)
- Emmanuelle Wilhelm
- RNA Group, Département de Microbiologie et d'Infectiologie, Faculté de Médecine et Sciences de la Santé, Université de Sherbrooke, Pavillon de Recherche Appliquée sur le Cancer, 3201 rue Jean-Migneault, Sherbrooke, Québec J1E 4K8, Canada
| | | | | | | | | | | |
Collapse
|
12
|
Selective binding of small molecules to DNA: Application and perspectives. Colloids Surf B Biointerfaces 2010; 79:1-4. [DOI: 10.1016/j.colsurfb.2010.03.048] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2010] [Accepted: 03/31/2010] [Indexed: 11/22/2022]
|
13
|
Nelson SM, Ferguson LR, Denny WA. Non-covalent ligand/DNA interactions: minor groove binding agents. Mutat Res 2007; 623:24-40. [PMID: 17507044 DOI: 10.1016/j.mrfmmm.2007.03.012] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2007] [Accepted: 03/31/2007] [Indexed: 05/15/2023]
Abstract
An understanding of the mechanism by which minor groove binding agents interact with DNA has led to the design of agents that can reversibly bind with high selectivity to extended DNA target sequences. Simple compounds, such as the polypyrroles and the bis-benzimidazoles, have been used as carriers for alkylating agents effectively directing alkylation to specific DNA sequences. The spectrum of DNA alkylation and mutation by classical alkylators, such as nitrogen mustards, has been profoundly modified by such attachment. The observed "side-by-side" binding of small polypyrrole antibiotics has led to the design of synthetic hairpin polyamides with programmable DNA sequence selectivity. These compounds are able to compete with natural substrates, such as specific transcription factors, and alter gene expression. They are being developed as artificial transcription factors, able to deliver activating peptides to specific recognition sequences, and as potential protein-DNA dimerization agents. Hairpin polyamides are also being used as carriers for the delivery of alkylators to defined DNA sites. The degree of control of gene expression thus offered by the hairpin polyamides suggests enormous promise for their clinical utility. Recent developments with other minor groove binding small molecules and technological advances are also discussed.
Collapse
Affiliation(s)
- Stephanie M Nelson
- Auckland Cancer Society Research Centre, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland 10000, New Zealand.
| | | | | |
Collapse
|
14
|
Zhang W, Bando T, Sugiyama H. Discrimination of Hairpin Polyamides with an α-Substituted-γ-aminobutyric Acid as a 5‘-TG-3‘ Reader in DNA Minor Groove. J Am Chem Soc 2006; 128:8766-76. [PMID: 16819870 DOI: 10.1021/ja0580587] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Pyrrole-imidazole (Py-Im) polyamides containing stereospecifically alpha-amino- or alpha-hydroxyl-substituted gamma-aminobutyric acid as a 5'-TG-3' recognition element were synthesized by machine-assisted Fmoc solid-phase synthesis. Their binding properties to predetermined DNA sequences containing a core binding site of 5'-TGCNCA-3'/3'-ACGN'GT-5' (N.N' = A.T, T.A, G.C, and C.G) were then systematically studied by surface plasmon resonance (SPR). SPR results revealed that the pairing of stereospecifically alpha-amino-/alpha-hydroxyl-substituted gamma-aminobutyric acids, (R or S)-alpha,gamma-diaminobutyric acid (gammaRN or gammaSN) and (R or S)-alpha-hydroxyl-gamma-aminobutyric acid (gammaRO or gammaSO), side-by-side with beta-alanine (beta) in such polyamides significantly influenced the DNA binding affinity and recognition specificity of hairpin polyamides in the DNA minor groove compared with beta/beta, beta/gamma, and gamma/beta pairings. More importantly, the polyamide Ac-Im-gammaSO-ImPy-gamma-ImPybetaPy-beta-Dp (beta/gammaSO) favorably binds to a hairpin DNA containing a core binding site of 5'-TGCNCA-3'/3'-ACGN'GT-5' (N.N' = A.T) with dissociation equilibrium constant (K(D)) of 1.9 x 10(-)(7) M over N.N' = T.A with K(D) = 3.7 x 10(-)(6) M, with a 19-fold specificity. By contrast, Ac-Im-gammaSN-ImPy-gamma-ImPybetaPy-beta-Dp (beta/gammaSN) binds to the above sequence with N.N' = A.T with K(D) = 8.7 x 10(-)(7) M over N.N' = T.A with K(D) = 8.4 x 10(-)(6) M, with a 9.6-fold specificity. The results also show that the stereochemistry of the alpha-substituent, as well as the alpha-substituent itself may greatly alter binding affinity and recognition selectivity of hairpin polyamides to different DNA sequences. Further, we carried out molecular modeling studies on the binding by an energy minimization method, suggesting that alpha-hydroxyl is very close to N3 of the 3'-terminal G to induce the formation of hydrogen bonding between hydroxyl and N3 in the recognition event of the polyamide Ac-Im-gammaSO-ImPy-gamma-ImPybetaPy-beta-Dp (beta/gammaSO) to 5'-TGCNCA-3'/3'-ACGN'GT-5' (N.N' = A.T). Therefore, SPR assays and molecular modeling studies collectively suggest that the (S)-alpha-hydroxyl-gamma-aminobutyric acid (gammaSO) may act as a 5'-TG-3' recognition unit.
Collapse
Affiliation(s)
- Wen Zhang
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | | | | |
Collapse
|
15
|
Gniazdowski M, Denny WA, Nelson SM, Czyz M. Effects of anticancer drugs on transcription factor–DNA interactions. Expert Opin Ther Targets 2005; 9:471-89. [PMID: 15948668 DOI: 10.1517/14728222.9.3.471] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
DNA-interacting anticancer drugs are able to affect the propensity of DNA to interact with proteins through either reversible binding or covalent bond formation. The effect of the drugs on transcription factor interactions with DNA is reviewed. These effects can be classified as (i) competition between a drug and regulatory protein for target sequences; (ii) weakening of this interaction; (iii) enhancement of this interaction by chemical modification of the DNA and the creation of non-natural binding sites; and (iv) a 'suicide' mechanism, which is observed when a transcription factor induces changes in DNA structure, allowing a drug to bind to a target sequence. Several new strategies -- the antigene approach with oligonucleotides, peptide nucleic acids or locked nucleic acids, and sequence-specific polyamides -- are also reviewed.
Collapse
Affiliation(s)
- Marek Gniazdowski
- Department of Medicinal Chemistry, Institute of Physiology and Biochemistry, Medical University of Lódz, Mazowiecka 6/8, 92-215 Lódz, Poland.
| | | | | | | |
Collapse
|
16
|
Blancafort P, Segal DJ, Barbas CF. Designing transcription factor architectures for drug discovery. Mol Pharmacol 2004; 66:1361-71. [PMID: 15340042 DOI: 10.1124/mol.104.002758] [Citation(s) in RCA: 148] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Recent advances in the design, selection, and engineering of DNA binding proteins have led to the emerging field of designer transcription factors (TFs). Modular DNA-binding protein domains can be assembled to recognize a given sequence of a DNA in a regulatory region of a targeted gene. TFs can be readily prepared by linking the DNA-binding protein to a variety of effector domains that mediate transcriptional activation or repression. Furthermore, the interaction between the TF and the genomic DNA can be regulated by several approaches, including chemical regulation by a variety of small molecules. Genome-wide single target specificity has been demonstrated using arrays of sequence-specific zinc finger (ZF) domains, polydactyl proteins. Any laboratory today can easily construct polydactyl ZF proteins by linkage of predefined ZF units that recognize specific triplets of DNA. The potential of this technology to alter the transcription of specific genes, to discover new genes, and to induce phenotypes in cells and organisms is now being applied in the areas of molecular therapeutics, pharmacology, biotechnology, and functional genomics.
Collapse
Affiliation(s)
- Pilar Blancafort
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA
| | | | | |
Collapse
|
17
|
Melander C, Burnett R, Gottesfeld JM. Regulation of gene expression with pyrrole–imidazole polyamides. J Biotechnol 2004; 112:195-220. [PMID: 15288953 DOI: 10.1016/j.jbiotec.2004.03.018] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2003] [Revised: 02/23/2004] [Accepted: 03/19/2004] [Indexed: 10/26/2022]
Abstract
The pyrrole-imidazole (Py-Im) polyamides represent the only available class of small molecules that can be designed to recognize virtually any predetermined DNA sequence. These molecules have affinities and specificities that equal or exceed natural eukaryotic transcriptional regulatory proteins. Studies with model gene systems, and a variety of eukaryotic and viral transcription factors, have shown that these molecules are potent inhibitors of protein-DNA interactions. Polyamides have been shown to regulate gene expression in simple in vitro systems using defined DNA templates and nuclear extracts as a source of the transcriptional machinery. Activation of gene expression has also been achieved in vitro with polyamide-activator peptide conjugates. Most importantly, polyamides are cell permeable and localize in the nucleus in various cultured cell lines and are capable of down regulating target genes in these cells. Polyamides have been shown to bind to their target sites in chromosomal DNA and both gain- and loss-of-function have been observed by targeting repeated DNA sequences in developing Drosophila embryos.
Collapse
Affiliation(s)
- Christian Melander
- Department of Molecular Biology, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA
| | | | | |
Collapse
|
18
|
Nelson SM, Ferguson LR, Denny WA. DNA and the chromosome - varied targets for chemotherapy. CELL & CHROMOSOME 2004; 3:2. [PMID: 15157277 PMCID: PMC421739 DOI: 10.1186/1475-9268-3-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2004] [Accepted: 05/24/2004] [Indexed: 12/29/2022]
Abstract
The nucleus of the cell serves to maintain, regulate, and replicate the critical genetic information encoded by the genome. Genomic DNA is highly associated with proteins that enable simple nuclear structures such as nucleosomes to form higher-order organisation such as chromatin fibres. The temporal association of regulatory proteins with DNA creates a dynamic environment capable of quickly responding to cellular requirements and distress. The response is often mediated through alterations in the chromatin structure, resulting in changed accessibility of specific DNA sequences that are then recognized by specific proteins. Anti-cancer drugs that target cellular DNA have been used clinically for over four decades, but it is only recently that nuclease specific drugs have been developed to not only target the DNA but also other components of the nuclear structure and its regulation. In this review, we discuss some of the new drugs aimed at primary DNA sequences, DNA secondary structures, and associated proteins, keeping in mind that these agents are not only important from a clinical perspective but also as tools for understanding the nuclear environment in normal and cancer cells.
Collapse
Affiliation(s)
- Stephanie M Nelson
- Auckland Cancer Society Research Centre, School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 10000, New Zealand
| | - Lynnette R Ferguson
- Auckland Cancer Society Research Centre, School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 10000, New Zealand
| | - William A Denny
- Auckland Cancer Society Research Centre, School of Medical Sciences, The University of Auckland, Private Bag 92019, Auckland 10000, New Zealand
| |
Collapse
|
19
|
Edelson BS, Best TP, Olenyuk B, Nickols NG, Doss RM, Foister S, Heckel A, Dervan PB. Influence of structural variation on nuclear localization of DNA-binding polyamide-fluorophore conjugates. Nucleic Acids Res 2004; 32:2802-18. [PMID: 15155849 PMCID: PMC419610 DOI: 10.1093/nar/gkh609] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2004] [Revised: 04/22/2004] [Accepted: 04/22/2004] [Indexed: 11/14/2022] Open
Abstract
A pivotal step forward in chemical approaches to controlling gene expression is the development of sequence-specific DNA-binding molecules that can enter live cells and traffic to nuclei unaided. DNA-binding polyamides are a class of programmable, sequence-specific small molecules that have been shown to influence a wide variety of protein-DNA interactions. We have synthesized over 100 polyamide-fluorophore conjugates and assayed their nuclear uptake profiles in 13 mammalian cell lines. The compiled dataset, comprising 1300 entries, establishes a benchmark for the nuclear localization of polyamide-dye conjugates. Compounds in this series were chosen to provide systematic variation in several structural variables, including dye composition and placement, molecular weight, charge, ordering of the aromatic and aliphatic amino-acid building blocks and overall shape. Nuclear uptake does not appear to be correlated with polyamide molecular weight or with the number of imidazole residues, although the positions of imidazole residues affect nuclear access properties significantly. Generally negative determinants for nuclear access include the presence of a beta-Ala-tail residue and the lack of a cationic alkyl amine moiety, whereas the presence of an acetylated 2,4-diaminobutyric acid-turn is a positive factor for nuclear localization. We discuss implications of these data on the design of polyamide-dye conjugates for use in biological systems.
Collapse
Affiliation(s)
- Benjamin S Edelson
- Division of Chemistry and Chemical Engineering and The Beckman Institute, California Institute of Technology, Pasadena, CA 91125, USA
| | | | | | | | | | | | | | | |
Collapse
|
20
|
Abstract
Chemical substances that can recognize and bind DNA in a sequence-specific manner have enormous importance in modern biology and medicine. When covalently linked, hairpin polyamides made up of N-methylpyrrole (Py) and N-methylimidazole (Im) can bind to DNA in a sequence-specific manner. An Im opposite a Py recognizes and binds G:C from C:G, whereas a Py opposite an Im recognizes and binds to C:G. A Py-Py pair degenerately binds to T:A or A:T, whereas a hydroxypyrrole opposite a Py recognizes and binds to T:A from A:T, and vice versa. A variant in this recognition is the beta-alanine (beta-ala-beta-ala) pair, which also degenerately binds to A:T or T:A. The hairpin polyamides are cell permeable and bind to DNA at nanomolar concentrations, with binding coefficients similar to those of transcription factors. This review comprehensively discusses the current literature on using the sequence-specific recognition ability of the polyamides to study various DNA-protein interactions.
Collapse
Affiliation(s)
- Musti Sree Rama Chandra Murty
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Surugadai, Kanda, Chiyoda-ku, Tokyo 101-0062, Japan
| | | |
Collapse
|
21
|
Best TP, Edelson BS, Nickols NG, Dervan PB. Nuclear localization of pyrrole-imidazole polyamide-fluorescein conjugates in cell culture. Proc Natl Acad Sci U S A 2003; 100:12063-8. [PMID: 14519850 PMCID: PMC218713 DOI: 10.1073/pnas.2035074100] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A series of hairpin pyrrole-imidazole polyamide-fluorescein conjugates were synthesized and assayed for cellular localization. Thirteen cell lines, representing 11 human cancers, one human transformed kidney cell line, and one murine leukemia cell line, were treated with 5 microM polyamide-fluorescein conjugates for 10-14 h, then imaged by confocal laser scanning microscopy. A conjugate containing a beta-alanine residue at the C terminus of the polyamide moiety showed no nuclear localization, whereas an analogous compound lacking the beta-alanine residue was strongly localized in the nuclei of all cell lines tested. The localization profiles of several other conjugates suggest that pyrrole-imidazole sequence and content, dye choice and position, linker composition, and molecular weight are determinants of nuclear localization. The attachment of fluorescein to the C terminus of a hairpin polyamide results in an approximately 10-fold reduction in DNA-binding affinity, with no loss of binding specificity with reference to mismatch binding sites.
Collapse
Affiliation(s)
- Timothy P Best
- Division of Chemistry and Chemical Engineering and The Beckman Institute, California Institute of Technology, Pasadena, CA 91125, USA
| | | | | | | |
Collapse
|
22
|
Fechter EJ, Dervan PB. Allosteric inhibition of protein--DNA complexes by polyamide--intercalator conjugates. J Am Chem Soc 2003; 125:8476-85. [PMID: 12848553 DOI: 10.1021/ja030125e] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The sequence-specific inhibition of essential protein-DNA contacts in the promoter of a gene is a central issue for the regulation of gene expression by chemical methods. Hairpin polyamides have been shown to inhibit protein-DNA complexes in some but not all cases. For example, polyamides co-occupy the same DNA sequence in the minor groove in the presence of major-groove binding bZip proteins. Four hairpin polyamide-acridine conjugates were synthesized and shown to bind the minor groove of DNA with high affinity in a sequence-specific manner. The polyamide-acridine conjugates were shown to unwind DNA (phi = 14-15 degrees), evidence for intercalation by the acridine moiety. Importantly, the polyamide-intercalator conjugates, which combine sequence-specific groove binding with proximal local unwinding, inhibit major-groove DNA binding by the GCN4 bZip protein. This class of DNA binding molecules creates a sequence-specific allosteric change in DNA structure and has the potential to be a general inhibitor of transcription factor binding independent of the specific protein-DNA structure.
Collapse
Affiliation(s)
- Eric J Fechter
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
| | | |
Collapse
|
23
|
Abstract
Many diseases, such as cancer, are related to aberrant gene expression. Regulating transcription by chemical methods could be important in human medicine. Minor groove-binding polyamides offer one chemical approach to DNA recognition.
Collapse
Affiliation(s)
- Peter B Dervan
- Division of Chemistry and Chemical Engineering, and Beckman Institute, California Institute of Technology, Pasadena, CA 91125, USA.
| | | |
Collapse
|
24
|
Olenyuk B, Jitianu C, Dervan PB. Parallel synthesis of H-pin polyamides by alkene metathesis on solid phase. J Am Chem Soc 2003; 125:4741-51. [PMID: 12696892 DOI: 10.1021/ja0213221] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A small library of H-pin polyamides with variable aliphatic bridge lengths (CH(2))(n)(), where n = 4-8, connecting a central Py/Py pair was prepared via parallel synthesis with Ru-catalyzed alkene metathesis on solid phase as a complexity-generating cross-linking reaction. DNA binding affinities and sequence specificities were analyzed for each member of the library to determine the optimum linker length. An H-pin polyamide with a six-methylene bridge was found to have the highest affinity to its match site with high selectivity over a 1-bp mismatch site. The relationship between the number of methylenes in the linker (CH(2))(n)() and affinity is n = 6 > 4 > 7 > 5 > 8. These results indicate that 6 followed by 4 methylene-bridged polyamides represent the optimum spacer length for the H-pin motif in the DNA minor groove. Importantly, the H-pin is competitive with hairpin polyamides with respect to affinity and specificity. The metathesis-based convergent synthetic route to H-pin polyamides expands the scope of readily available DNA recognition motifs for small molecule-based gene regulation studies.
Collapse
Affiliation(s)
- Bogdan Olenyuk
- Division of Chemistry and Chemical Engineering, The Beckman Institute, California Institute of Technology, Pasadena, California 91125, USA
| | | | | |
Collapse
|
25
|
Kotova I, Chabes AL, Lobov S, Thelander L, Björklund S. Sequences downstream of the transcription initiation site are important for proper initiation and regulation of mouse ribonucleotide reductase R2 gene transcription. EUROPEAN JOURNAL OF BIOCHEMISTRY 2003; 270:1791-801. [PMID: 12694192 DOI: 10.1046/j.1432-1033.2003.03541.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Ribonucleotide reductase is essential for the synthesis of all four dNTPs required for DNA replication. The enzyme is composed of two proteins, R1 and R2, which are both needed for activity. Expression of the R1 and R2 mRNAs is restricted to the S-phase of the cell cycle, but the R1 and R2 promoters show no obvious sequence homologies that could indicate coordination of transcription. Here we study initiation of transcription at the natural mouse R2 promoter, which contains an atypical TATA-box with the sequence TTTAAA, using a combination of in vivo reporter gene assays and in vitro transcription. Our results indicate that in constructs where sequences from the R2 5'-UTR are present, the mouse R2 TATA-box is dispensable both for unregulated, basal transcription from the R2 promoter and for S-phase specific activity. Instead, initiation of R2 transcription is directed by sequences downstream from the transcription start. We report that this region contains a conserved palindrome sequence that interacts with TAFIIs. This interaction down-regulates basal transcription from the R2 promoter, both in the absence and in the presence of the TATA-box.
Collapse
Affiliation(s)
- Irina Kotova
- Department of Medical Biochemistry and Biophysics, Umeå University, Sweden
| | | | | | | | | |
Collapse
|
26
|
Bando T, Narita A, Saito I, Sugiyama H. Highly efficient sequence-specific DNA interstrand cross-linking by pyrrole/imidazole CPI conjugates. J Am Chem Soc 2003; 125:3471-85. [PMID: 12643709 DOI: 10.1021/ja028459b] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We have developed a novel type of DNA interstrand cross-linking agent by synthesizing dimers of a pyrrole (Py)/imidazole (Im)-diamide-CPI conjugate, ImPyLDu86 (1), connected using seven different linkers. The tetramethylene linker compound, 7b, efficiently produces DNA interstrand cross-links at the nine-base-pair sequence, 5'-PyGGC(T/A)GCCPu-3', only in the presence of a partner triamide, ImImPy. For efficient cross-linking by 7b with ImImPy, one A.T base pair between two recognition sites was required to accommodate the linker region. Elimination of the A.T base pair and insertion of an additional A.T base pair and substitution with a G.C base pair significantly reduced the degree of cross-linking. The sequence specificity of the interstrand cross-linking by 7b was also examined in the presence of various triamides. The presence of ImImIm slightly reduced the formation of a cross-linked product compared to ImImPy. The mismatch partners, ImPyPy and PyImPy, did not produce an interstrand cross-link product with 7b, whereas ImPyPy and PyImPy induced efficient alkylation at their matching site with 7b. The interstrand cross-linking abilities of 7b were further examined using denaturing polyacrylamide gel electrophoresis with 5'-Texas Red-labeled 400- and 67-bp DNA fragments. The sequencing gel analysis of the 400-bp DNA fragment with ImImPy demonstrated that 7b alkylates several sites on the top and bottom strands, including one interstrand cross-linking match site, 5'-PyGGC(T/A)GCCPu-3'. To obtain direct evidence of interstrand cross-linkages on longer DNA fragments, a simple method using biotin-labeled complementary strands was developed, which produced a band corresponding to the interstrand cross-linked site on both top and bottom strands. Densitometric analysis indicated that the contribution of the interstrand cross-link in the observed alkylation bands was approximately 40%. This compound efficiently cross-linked both strands at the target sequence. The present system consisted of a 1:2 complex of the alkylating agent and its partner ImImPy and caused an interstrand cross-linking in a sequence-specific fashion according to the base-pair recognition rule of Py-Im polyamides.
Collapse
Affiliation(s)
- Toshikazu Bando
- Division of Biofunctional Molecules, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Surugadai, Kanda, Chiyoda, Tokyo 101-0062, Japan
| | | | | | | |
Collapse
|