ACETYL COENZYME *A / ACETATE ION / COENZYME A / AMMONIUM ION / Acetyl-CoA acetyltransferase erg10B, cytosolic 類似検索 - 構成要素
生物種
Aspergillus fumigatus Af293 (カビ)
手法
X線回折 / シンクロトロン / 分子置換 / 解像度: 1.75 Å
Model details
Crystallized in the presence of acetyl-CoA, K+, and NH4+. 3 active sites contain Ac-Cys92+CoA: 1 ...Crystallized in the presence of acetyl-CoA, K+, and NH4+. 3 active sites contain Ac-Cys92+CoA: 1 site contains Ac-Cys92+Ac-CoA (alternate conformations).
The protein was co-crystallised with acetyl-CoA. It is an acetoacetyl-CoA thiolase, producing ...The protein was co-crystallised with acetyl-CoA. It is an acetoacetyl-CoA thiolase, producing acetoacetyl-CoA from two molecules of acetyl-CoA. The reaction proceeds via two acetyl transfer steps: (1) Ac-CoA -> enzyme, producing CoA and acetylated enzyme (SCY92), and (2) Ac-enzyme -> Ac-CoA, producing acetoacetyl-CoA. The enzyme is a homotetramer, thus 4 active sites per AU. For two of the active sites (chains A and B), the density indicates that CoA and SCY are present (after (1)). For chain D, the tetrahedral intermediate that occurs during the first acetyl transfer is trapped. To model this we used three separate entities: cys92, an acetyl group, and CoA. Covalent bonds were defined between these during refinement. For chain C, the tetrahedral intermediate that occurs during the second acetyl transfer is trapped. To model this we used cys92, an acetyl group, and acetyl-CoA.