2R8E

Crystal structure of YrbI from Escherichia coli in complex with Mg

2R8E の概要

• エントリーDOI: 10.2210/pdb2r8e/pdb
• 関連するPDBエントリー: 2R8X 2R8Y 2R8Z
• 分子名称: 3-deoxy-D-manno-octulosonate 8-phosphate phosphatase, MAGNESIUM ION, CHLORIDE ION, ... (4 entities in total)
• 機能のキーワード: phosphatase, yrbi, divalent metal, had superfamily, kdo 8-p, hydrolase, lipopolysaccharide biosynthesis, magnesium
• 由来する生物種: Escherichia coli O6
• タンパク質・核酸の鎖数: 8
• 化学式量合計: 160625.22

構造登録者

Tsodikov, O.V.,Aggarwal, P.,Rubin, J.R.,Stuckey, J.A.,Woodard, R.,Biswas, T. (登録日: 2007-09-10, 公開日: 2008-09-23, 最終更新日: 2024-02-21)

主引用文献

Biswas, T.,Yi, L.,Aggarwal, P.,Wu, J.,Rubin, J.R.,Stuckey, J.A.,Woodard, R.W.,Tsodikov, O.V.
The Tail of KdsC: CONFORMATIONAL CHANGES CONTROL THE ACTIVITY OF A HALOACID DEHALOGENASE SUPERFAMILY PHOSPHATASE.
J.Biol.Chem., 284:30594-30603, 2009

PubMed Abstract: The phosphatase KdsC cleaves 3-deoxy-D-manno-octulosonate 8-phosphate to generate a molecule of inorganic phosphate and Kdo. Kdo is an essential component of the lipopolysaccharide envelope in Gram-negative bacteria. Because lipopolysaccharide is an important determinant of bacterial resistance and toxicity, KdsC is a potential target for novel antibacterial agents. KdsC belongs to the broad haloacid dehalogenase superfamily. In haloacid dehalogenase superfamily enzymes, substrate specificity and catalytic efficiency are generally dictated by a fold feature called the cap domain. It is therefore not clear why KdsC, which lacks a cap domain, is catalytically efficient and highly specific to 3-deoxy-D-manno-octulosonate 8-phosphate. Here, we present a set of seven structures of tetrameric Escherichia coli KdsC (ranging from 1.4 to 3.06 A in resolution) that model different intermediate states in its catalytic mechanism. A crystal structure of product-bound E. coli KdsC shows how the interface between adjacent monomers defines the active site pocket. Kdo is engaged in a network of polar and nonpolar interactions with residues at this interface, which explains substrate specificity. Furthermore, this structural and kinetic analysis strongly suggests that the binding of the flexible C-terminal region (tail) to the active site makes KdsC catalytically efficient by facilitating product release.

PubMed: 19726684
DOI: 10.1074/jbc.M109.012278

実験手法

X-RAY DIFFRACTION (1.4 Å)