1rr8

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{{STRUCTURE_1rr8| PDB=1rr8 | SCENE= }}
{{STRUCTURE_1rr8| PDB=1rr8 | SCENE= }}
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'''Structural Mechanisms of Camptothecin Resistance by Mutations in Human Topoisomerase I'''
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===Structural Mechanisms of Camptothecin Resistance by Mutations in Human Topoisomerase I===
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==Overview==
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Human topoisomerase I relaxes superhelical tension associated with DNA replication, transcription and recombination by reversibly nicking one strand of duplex DNA and forming a covalent 3'-phosphotyrosine linkage. This enzyme is the sole target of the camptothecin family of anticancer compounds, which acts by stabilizing the covalent protein-DNA complex and enhancing apoptosis through blocking the advancement of replication forks. Mutations that impart resistance to camptothecin have been identified in several regions of human topoisomerase I. We present the crystal structures of two camptothecin-resistant forms of human topoisomerase I (Phe361Ser at 2.6A resolution and Asn722Ser at 2.3A resolution) in ternary complexes with DNA and topotecan (Hycamtin), a camptothecin analogue currently in widespread clinical use. While the alteration of Asn722 to Ser leads to the elimination of a water-mediated contact between the enzyme and topotecan, we were surprised to find that a well-ordered water molecule replaces the hydrophobic phenylalanine side-chain in the Phe361Ser structure. We further consider camptothecin-resistant mutations at seven additional sites in human topoisomerase I and present structural evidence explaining their possible impact on drug binding. These results advance our understanding of the mechanism of cell poisoning by camptothecin and suggest specific modifications to the drug that may improve efficacy.
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==Disease==
==Disease==
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[[Category: Protein-dna complex]]
[[Category: Protein-dna complex]]
[[Category: Topotecan]]
[[Category: Topotecan]]
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Revision as of 14:36, 27 July 2008

Image:1rr8.png

Template:STRUCTURE 1rr8

Contents

Structural Mechanisms of Camptothecin Resistance by Mutations in Human Topoisomerase I

Template:ABSTRACT PUBMED 15165849

Disease

Known disease associated with this structure: DNA topoisomerase I, camptothecin-resistant OMIM:[126420]

About this Structure

1RR8 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Mechanisms of camptothecin resistance by human topoisomerase I mutations., Chrencik JE, Staker BL, Burgin AB, Pourquier P, Pommier Y, Stewart L, Redinbo MR, J Mol Biol. 2004 Jun 11;339(4):773-84. PMID:15165849

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