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263d

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{{STRUCTURE_263d| PDB=263d | SCENE= }}
{{STRUCTURE_263d| PDB=263d | SCENE= }}
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'''ISOHELICITY AND PHASING IN DRUG-DNA SEQUENCE RECOGNITION: CRYSTAL STRUCTURE OF A TRIS(BENZIMIDAZOLE)-OLIGONUCLEOTIDE COMPLEX'''
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===ISOHELICITY AND PHASING IN DRUG-DNA SEQUENCE RECOGNITION: CRYSTAL STRUCTURE OF A TRIS(BENZIMIDAZOLE)-OLIGONUCLEOTIDE COMPLEX===
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==Overview==
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The crystal structure is reported of a tris(benzimidazole) analogue of the minor-groove drug Hoechst 33258 bound to the sequence d(CGCAAATTTGCG)2. The structure has been refined to an R factor of 17.4% at a resolution of 2.2 A. The ligand covers approximately 7 1/2 base pairs, including the 5'-AAATTT central sequence. This has an exceptionally narrow minor-groove width, together with high propeller twists for individual base pairs. The ligand has a highly twisted structure, with an overall twist of 50 degrees between aromatic rings. All three benzimidazole subunits are in register with the DNA, and there is a symmetric group of six hydrogen bonds between ligand and A.T base-pair edges. By contrast, the ligand does not show an optimal isohelical fit to the DNA. The correct phasing of drug and DNA base pairs is ensured by a number of changes to the DNA such that the central 5'-AAATTT region is slightly unwound relative to the structures of other noncovalent minor-groove drug complexes.
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{{ABSTRACT_PUBMED_8901516}}
==About this Structure==
==About this Structure==
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[[Category: Complexed with drug]]
[[Category: Complexed with drug]]
[[Category: Double helix]]
[[Category: Double helix]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 18:24:32 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 15:04:27 2008''

Revision as of 12:04, 29 July 2008

Image:263d.png

Template:STRUCTURE 263d

ISOHELICITY AND PHASING IN DRUG-DNA SEQUENCE RECOGNITION: CRYSTAL STRUCTURE OF A TRIS(BENZIMIDAZOLE)-OLIGONUCLEOTIDE COMPLEX

Template:ABSTRACT PUBMED 8901516

About this Structure

Full crystallographic information is available from OCA.

Reference

Isohelicity and phasing in drug--DNA sequence recognition: crystal structure of a tris(benzimidazole)--oligonucleotide complex., Clark GR, Gray EJ, Neidle S, Li YH, Leupin W, Biochemistry. 1996 Oct 29;35(43):13745-52. PMID:8901516

Page seeded by OCA on Tue Jul 29 15:04:27 2008

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