5VJ5

Horse Liver Alcohol Dehydrogenase Complexed with 1,10-Phenanthroline

5VJ5 の概要

• エントリーDOI: 10.2210/pdb5vj5/pdb
• 関連するPDBエントリー: 1YE3 5VJG 5VKR 5VL0 8ADH
• 分子名称: Alcohol dehydrogenase E chain, ZINC ION, 1,10-PHENANTHROLINE, ... (4 entities in total)
• 機能のキーワード: alcohol dehydrogenase, 1, 10-phenanthroline, zinc chelation, liver, apoenzyme, oxidoreductase
• 由来する生物種: Equus caballus (Horse)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 80328.59

構造登録者

Plapp, B.V.,Baskar Raj, S.,Ramaswamy, S. (登録日: 2017-04-18, 公開日: 2017-05-03, 最終更新日: 2023-10-04)

主引用文献

Plapp, B.V.,Savarimuthu, B.R.,Ferraro, D.J.,Rubach, J.K.,Brown, E.N.,Ramaswamy, S.
Horse Liver Alcohol Dehydrogenase: Zinc Coordination and Catalysis.
Biochemistry, 56:3632-3646, 2017

PubMed Abstract: During catalysis by liver alcohol dehydrogenase (ADH), a water bound to the catalytic zinc is replaced by the oxygen of the substrates. The mechanism might involve a pentacoordinated zinc or a double-displacement reaction with participation by a nearby glutamate residue, as suggested by studies of human ADH3, yeast ADH1, and some other tetrameric ADHs. Zinc coordination and participation of water in the enzyme mechanism were investigated by X-ray crystallography. The apoenzyme and its complex with adenosine 5'-diphosphoribose have an open protein conformation with the catalytic zinc in one position, tetracoordinated by Cys-46, His-67, Cys-174, and a water molecule. The bidentate chelators 2,2'-bipyridine and 1,10-phenanthroline displace the water and form a pentacoordinated zinc. The enzyme-NADH complex has a closed conformation similar to that of ternary complexes with coenzyme and substrate analogues; the coordination of the catalytic zinc is similar to that found in the apoenzyme, except that a minor, alternative position for the catalytic zinc is ∼1.3 Å from the major position and closer to Glu-68, which could form the alternative coordination to the catalytic zinc. Complexes with NADH and N-1-methylhexylformamide or N-benzylformamide (or with NAD and fluoro alcohols) have the classical tetracoordinated zinc, and no water is bound to the zinc or the nicotinamide rings. The major forms of the enzyme in the mechanism have a tetracoordinated zinc, where the carboxylate group of Glu-68 could participate in the exchange of water and substrates on the zinc. Hydride transfer in the Michaelis complexes does not involve a nearby water.

PubMed: 28640600
DOI: 10.1021/acs.biochem.7b00446

実験手法

X-RAY DIFFRACTION (1.9 Å)