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2gb9

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{{STRUCTURE_2gb9| PDB=2gb9 | SCENE= }}
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'''d(CGTACG)2 crosslinked bis-acridine complex'''
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===d(CGTACG)2 crosslinked bis-acridine complex===
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==Overview==
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Acridine-4-carboxamides form a class of known DNA mono-intercalating agents that exhibit cytotoxic activity against tumour cell lines due to their ability to inhibit topoisomerases. Previous studies of bis-acridine derivatives have yielded equivocal results regarding the minimum length of linker necessary between the two acridine chromophores to allow bis-intercalation of duplex DNA. We report here the 1.7 A resolution X-ray crystal structure of a six-carbon-linked bis(acridine-4-carboxamide) ligand bound to d(CGTACG)2 molecules by non-covalent duplex cross-linking. The asymmetric unit consists of one DNA duplex containing an intercalated acridine-4-carboxamide chromophore at each of the two CG steps. The other half of each ligand is bound to another DNA molecule in a symmetry-related manner, with the alkyl linker threading through the minor grooves. The two crystallographically independent ligand molecules adopt distinct side chain interactions, forming hydrogen bonds to either O6 or N7 on the major groove face of guanine, in contrast to the semi-disordered state of mono-intercalators bound to the same DNA molecule. The complex described here provides the first structural evidence for the non-covalent cross-linking of DNA by a small molecule ligand and suggests a possible explanation for the inconsistent behaviour of six-carbon linked bis-acridines in previous assays of DNA bis-intercalation.
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{{ABSTRACT_PUBMED_17145714}}
==About this Structure==
==About this Structure==
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[[Category: Searcey, M.]]
[[Category: Searcey, M.]]
[[Category: Dna duplex crosslinking]]
[[Category: Dna duplex crosslinking]]
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Revision as of 07:01, 28 July 2008

Image:2gb9.png

Template:STRUCTURE 2gb9

d(CGTACG)2 crosslinked bis-acridine complex

Template:ABSTRACT PUBMED 17145714

About this Structure

Full crystallographic information is available from OCA.

Reference

X-ray crystallographic study of DNA duplex cross-linking: simultaneous binding to two d(CGTACG)2 molecules by a bis(9-aminoacridine-4-carboxamide) derivative., Hopcroft NH, Brogden AL, Searcey M, Cardin CJ, Nucleic Acids Res. 2006;34(22):6663-72. Epub 2006 Dec 1. PMID:17145714

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