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6bna

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{{STRUCTURE_6bna| PDB=6bna | SCENE= }}
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'''BINDING OF AN ANTITUMOR DRUG TO DNA. NETROPSIN AND C-G-C-G-A-A-T-T-BRC-G-C-G'''
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===BINDING OF AN ANTITUMOR DRUG TO DNA. NETROPSIN AND C-G-C-G-A-A-T-T-BRC-G-C-G===
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==Overview==
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The antitumor antibiotic netropsin has been co-crystallized with a double-helical B-DNA dodecanucleotide of sequence: C-G-C-G-A-A-T-T-BrC-G-C-G, and the structure of the complex has been solved by X-ray diffraction at a resolution of 2.2 A. The structure has been refined independently by Jack-Levitt and Hendrickson-Konnert least-squares methods, leading to a final residual error of 0.257 by the Jack-Levitt approach (0.211 for two-sigma data) or 0.248 by the Hendrickson-Konnert approach, with no significant difference between refined structures. The netropsin molecule displaces the spine of hydration and fits snugly within the minor groove in the A-A-T-T center. It widens the groove slightly and bends the helix axis back by 8 degrees, but neither unwinds nor elongates the double helix. The drug molecule is held in place by amide NH hydrogen bonds that bridge adenine N-3 and thymine O-2 atoms, exactly as with the spine of hydration. The requirement of A X T base-pairs in the binding site arises because the N-2 amino group of guanine would demand impermissibly close contacts with netropsin. It is proposed that substitution of imidazole for pyrrole in netropsin should create a family of "lexitropsins" capable of reading G X C-containing base sequences.
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{{ABSTRACT_PUBMED_2991536}}
==About this Structure==
==About this Structure==
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Revision as of 11:15, 3 July 2008

Image:6bna.png

Template:STRUCTURE 6bna

BINDING OF AN ANTITUMOR DRUG TO DNA. NETROPSIN AND C-G-C-G-A-A-T-T-BRC-G-C-G

Template:ABSTRACT PUBMED 2991536

About this Structure

Full crystallographic information is available from OCA.

Reference

Binding of an antitumor drug to DNA, Netropsin and C-G-C-G-A-A-T-T-BrC-G-C-G., Kopka ML, Yoon C, Goodsell D, Pjura P, Dickerson RE, J Mol Biol. 1985 Jun 25;183(4):553-63. PMID:2991536

Page seeded by OCA on Thu Jul 3 14:15:09 2008

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