1NDR

CRYSTALLOGRAPHIC STRUCTURE OF A BLUE COPPER NITRITE REDUCTASE FROM ALCALIGENES XYLOSOXIDANS

1NDR の概要

• エントリーDOI: 10.2210/pdb1ndr/pdb
• 分子名称: NITRITE REDUCTASE, COPPER (II) ION (3 entities in total)
• 機能のキーワード: blue copper nitrite reductase, copper protein, nitrite reduction, reductase
• 由来する生物種: Achromobacter xylosoxidans
• 細胞内の位置: Periplasm (By similarity): P81445
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 103706.41

構造登録者

Dodd, F.E.,Hasnain, S.S.,Abraham, Z.H.L.,Eady, R.R.,Smith, B.E. (登録日: 1997-01-23, 公開日: 1997-07-07, 最終更新日: 2024-05-22)

主引用文献

Dodd, F.E.,Hasnain, S.S.,Abraham, Z.H.,Eady, R.R.,Smith, B.E.
Structures of a blue-copper nitrite reductase and its substrate-bound complex.
Acta Crystallogr.,Sect.D, 53:406-418, 1997

PubMed Abstract: Copper-containing nitrite reductases (NiR's) have been conveniently subdivided into blue and green NiR's which are thought to be redox partners of azurins and pseudo-azurins, respectively. Crystal structures of two green NiR's have recently been determined. Alcaligenes xylosoxidans has been shown to have a blue-copper nitrite reductase (AxNiR) and two azurins with 67% homology both of which donate electrons to it effectively. The first crystal structure of a blue NiR (AxNiR) in its oxidized and nitrite-bound forms, with particular emphasis to the Cu sites, is presented. The Cu-Smet distance is the same as those in the green NiR's. Thus, the length of this interaction is unlikely to be responsible for differences in colour. Crystallographic data presented here taken together with structural data of other single Cu type-1 proteins and their mutants suggest that the displacement of Cu from the strong ligand plane is perhaps the cause for the differences in colour observed for otherwise 'classical' blue Cu centre. Nitrite is observed binding to the catalytic Cu in a bidentate fashion displacing the water molecule, offering a neat rationalization for the XAFS observation that the type-2 Cu-ligand distances increase on nitrite binding as a result of increased coordination. These results are discussed in terms of enzyme mechanism.

PubMed: 15299906
DOI: 10.1107/S0907444997002667

実験手法

X-RAY DIFFRACTION (3 Å)