2jgo

From Proteopedia

Revision as of 16:29, 5 November 2007

STUCTURE OF THE ARSENATED DE NOVO DESIGNED PEPTIDE COIL SER L9C

Overview

Arsenic, a contaminant of water supplies worldwide, is one of the most, toxic inorganic ions. Despite arsenic's health impact, there is relatively, little structural detail known about its interactions with proteins., Bacteria such as Escherichia coli have evolved arsenic resistance using, the Ars operon that is regulated by ArsR, a repressor protein that, dissociates from DNA when As(III) binds. This protein undergoes a critical, conformational change upon binding As(III) with three cysteine residues., Unfortunately, structures of ArsR with or without As(III) have not been, reported. Alternatively, de novo designed peptides can bind As(III) in an, endo configuration within a thiolate-rich environment consistent with that, proposed for both ArsR and ArsD. We report the structure of the As(III), complex of Coil Ser L9C to a 1.8-A resolution, providing x-ray, characterization of As(III) in a Tris thiolate protein environment and, allowing a structural basis by which to understand arsenated ArsR.

About this Structure

2JGO is a Single protein structure of sequence from [1] with ZN, ACE, NH2 and ARS as ligands. Structure known Active Site: AC1. Full crystallographic information is available from OCA.

Reference

Identifying important structural characteristics of arsenic resistance proteins by using designed three-stranded coiled coils., Touw DS, Nordman CE, Stuckey JA, Pecoraro VL, Proc Natl Acad Sci U S A. 2007 Jul 17;104(29):11969-74. Epub 2007 Jul 3. PMID:17609383

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