3HBL

Crystal Structure of S. aureus Pyruvate Carboxylase T908A Mutant

3HBL の概要

• エントリーDOI: 10.2210/pdb3hbl/pdb
• 関連するPDBエントリー: 3HB9
• 分子名称: Pyruvate carboxylase, 5-(HEXAHYDRO-2-OXO-1H-THIENO[3,4-D]IMIDAZOL-6-YL)PENTANAL, MANGANESE (II) ION, ... (4 entities in total)
• 機能のキーワード: tim barrel, pyruvate, ligase
• 由来する生物種: Staphylococcus aureus subsp. aureus Mu50
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 516269.73

構造登録者

Tong, L.,Yu, L.P.C. (登録日: 2009-05-04, 公開日: 2009-06-30, 最終更新日: 2021-10-13)

主引用文献

Yu, L.P.,Xiang, S.,Lasso, G.,Gil, D.,Valle, M.,Tong, L.
A Symmetrical Tetramer for S. aureus Pyruvate Carboxylase in Complex with Coenzyme A.
Structure, 17:823-832, 2009

PubMed Abstract: Pyruvate carboxylase (PC) is a conserved metabolic enzyme with important cellular functions. We report crystallographic and cryo-electron microscopy (EM) studies of Staphylococcus aureus PC (SaPC) in complex with acetyl-CoA, an allosteric activator, and mutagenesis, biochemical, and structural studies of the biotin binding site of its carboxyltransferase (CT) domain. The disease-causing A610T mutation abolishes catalytic activity by blocking biotin binding to the CT active site, and Thr908 might play a catalytic role in the CT reaction. The crystal structure of SaPC in complex with CoA reveals a symmetrical tetramer, with one CoA molecule bound to each monomer, and cryo-EM studies confirm the symmetrical nature of the tetramer. These observations are in sharp contrast to the highly asymmetrical tetramer of Rhizobium etli PC in complex with ethyl-CoA. Our structural information suggests that acetyl-CoA promotes a conformation for the dimer of the biotin carboxylase domain of PC that might be catalytically more competent.

PubMed: 19523900
DOI: 10.1016/j.str.2009.04.008

実験手法

X-RAY DIFFRACTION (2.71 Å)