6H55

core of the human pyruvate dehydrogenase (E2)

6H55 の概要

• エントリーDOI: 10.2210/pdb6h55/pdb
• EMDBエントリー: 0138
• 分子名称: Dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex, mitochondrial (1 entity in total)
• 機能のキーワード: pyruvate dehydrogenase, human, oxidoreductase
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 69069.40

構造登録者

Haselbach, D.,Prajapati, S.,Tittmann, K.,Stark, H. (登録日: 2018-07-23, 公開日: 2019-06-05, 最終更新日: 2024-05-15)

主引用文献

Prajapati, S.,Haselbach, D.,Wittig, S.,Patel, M.S.,Chari, A.,Schmidt, C.,Stark, H.,Tittmann, K.
Structural and Functional Analyses of the Human PDH Complex Suggest a "Division-of-Labor" Mechanism by Local E1 and E3 Clusters.
Structure, 27:1124-1136.e4, 2019

PubMed Abstract: The pseudo-atomic structural model of human pyruvate dehydrogenase complex (PDHc) core composed of full-length E2 and E3BP components, calculated from our cryoelectron microscopy-derived density maps at 6-Å resolution, is similar to those of prokaryotic E2 structures. The spatial organization of human PDHc components as evidenced by negative-staining electron microscopy and native mass spectrometry is not homogeneous, and entails the unanticipated formation of local clusters of E1:E2 and E3BP:E3 complexes. Such uneven, clustered organization translates into specific duties for E1-E2 clusters (oxidative decarboxylation and acetyl transfer) and E3BP-E3 clusters (regeneration of reduced lipoamide) corresponding to half-reactions of the PDHc catalytic cycle. The addition of substrate coenzyme A modulates the conformational landscape of PDHc, in particular of the lipoyl domains, extending the postulated multiple random coupling mechanism. The conformational and associated chemical landscapes of PDHc are thus not determined entirely stochastically, but are restrained and channeled through an asymmetric architecture and further modulated by substrate binding.

PubMed: 31130485
DOI: 10.1016/j.str.2019.04.009

実験手法

ELECTRON MICROSCOPY (6 Å)