2jgo

Structure of the arsenated de novo designed peptide Coil Ser L9C

spinqualitylabelsall models 2jgo, resolution 1.81Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2jgo is a 3 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ARS, ZN NonStd Res: ACE, NH2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed 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. 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 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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