4KNU

Copper nitrite reductase from Nitrosomonas europaea at pH 6.5

4KNU の概要

• エントリーDOI: 10.2210/pdb4knu/pdb
• 関連するPDBエントリー: 4KNS 4KNT
• 分子名称: Multicopper oxidase type 1, COPPER (II) ION, GLYCEROL, ... (5 entities in total)
• 機能のキーワード: nitrite reductase, oxidoreductase
• 由来する生物種: Nitrosomonas europaea
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 190491.91

構造登録者

Rosenzweig, A.C.,Lawton, T.L.,Sayavedra-Soto, L.A.,Arp, D.J. (登録日: 2013-05-10, 公開日: 2013-07-24, 最終更新日: 2024-02-28)

主引用文献

Lawton, T.J.,Bowen, K.E.,Sayavedra-Soto, L.A.,Arp, D.J.,Rosenzweig, A.C.
Characterization of a nitrite reductase involved in nitrifier denitrification.
J.Biol.Chem., 288:25575-25583, 2013

PubMed Abstract: Nitrifier denitrification is the conversion of nitrite to nitrous oxide by ammonia-oxidizing organisms. This process, which is distinct from denitrification, is active under aerobic conditions in the model nitrifier Nitrosomonas europaea. The central enzyme of the nitrifier dentrification pathway is a copper nitrite reductase (CuNIR). To understand how a CuNIR, typically inactivated by oxygen, functions in this pathway, the enzyme isolated directly from N. europaea (NeNIR) was biochemically and structurally characterized. NeNIR reduces nitrite at a similar rate to other CuNIRs but appears to be oxygen tolerant. Crystal structures of oxidized and reduced NeNIR reveal a substrate channel to the active site that is much more restricted than channels in typical CuNIRs. In addition, there is a second fully hydrated channel leading to the active site that likely acts a water exit pathway. The structure is minimally affected by changes in pH. Taken together, these findings provide insight into the molecular basis for NeNIR oxygen tolerance.

PubMed: 23857587
DOI: 10.1074/jbc.M113.484543

実験手法

X-RAY DIFFRACTION (1.8 Å)