6EEU

Structure of class II HMG-CoA reductase from Delftia acidovorans

6EEU の概要

• エントリーDOI: 10.2210/pdb6eeu/pdb
• 分子名称: 3-hydroxy-3-methylglutaryl coenzyme A reductase, SULFATE ION, 1,2-ETHANEDIOL, ... (4 entities in total)
• 機能のキーワード: mevalonate pathway, oxidoreductase
• 由来する生物種: Delftia acidovorans
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 45507.02

構造登録者

Ragwan, E.R.,Arai, E.,Kung, Y. (登録日: 2018-08-15, 公開日: 2018-09-26, 最終更新日: 2024-03-13)

主引用文献

Ragwan, E.R.,Arai, E.,Kung, Y.
New Crystallographic Snapshots of Large Domain Movements in Bacterial 3-Hydroxy-3-methylglutaryl Coenzyme A Reductase.
Biochemistry, 57:5715-5725, 2018

PubMed Abstract: The enzyme 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase (HMGR) catalyzes the first committed step of the mevalonate pathway, which is used across biology in the biosynthesis of countless metabolites. HMGR consumes 2 equiv of the cofactor NAD(P)H to perform the four-electron reduction of HMG-CoA to mevalonate toward the production of steroids and isoprenoids, the largest class of natural products. Recent structural data have shown that HMGR contains a highly mobile C-terminal domain (CTD) that is believed to adopt many different conformations to permit binding and dissociation of the substrate, cofactors, and products at specific points during the reaction cycle. Here, we have characterized the HMGR from Delftia acidovorans as an NADH-specific enzyme and determined crystal structures of the enzyme in unbound, mevalonate-bound, and NADH- and citrate-bound states. Together, these structures depict ligand binding in both the active site and the cofactor-binding site while illustrating how a conserved helical motif confers NAD(P)H cofactor specificity. Unexpectedly, the NADH-bound structure also reveals a new conformation of the CTD, in which the domain has "flipped" upside-down, while directly binding the cofactor. By capturing these structural snapshots, this work not only expands the known range of HMGR domain movement but also provides valuable insight into the catalytic mechanism of this biologically important enzyme.

PubMed: 30199631
DOI: 10.1021/acs.biochem.8b00869

実験手法

X-RAY DIFFRACTION (1.93 Å)