当前位置： SCI文献检索 > JOURNAL OF INORGANIC BIOCHEMISTRY期刊下所有文献 > Spectroscopic and functional characterization of Cu-containing nitrite reductase from Hyphomicrobium denitrificans A3151.

Spectroscopic and functional characterization of Cu-containing nitrite reductase from Hyphomicrobium denitrificans A3151.

Abstract：

:The Cu-containing nitrite reductase from Hyphomicrobium denitrificans (HydNIR) has been spectroscopically and functionally characterized. The visible absorption spectrum implies that the enzyme has two type 1 Cu ions in one subunit (ca. 50 kDa). The electron paramagnetic resonance (EPR) spectrum of HydNIR is simulated assuming the sum of three distinct S = 1/2 systems: two type 1 Cu signals (axial and rhombic symmetries) and one type 2 Cu signal. The intramolecular electron transfer reaction from the type 1 Cu to the type 2 Cu at pH 6.0 does not occur in the absence of nitrite, but a very slow electron transfer reaction is observed in the presence of nitrite. The apparent first-order rate constants for the intramolecular electron transfer reactions (k(ET(intra))) in the presence of nitrite and also the apparent catalytic rate constants (k(cat)) of HydNIR decrease gradually with increasing pH in the range of pH 4.5-7.5. These pH profiles are substantially similar to each other, suggesting that the intramolecular electron transfer process is linked to the subsequent nitrite reduction process.

journal_name

J Inorg Biochem

journal_title

Journal of inorganic biochemistry

authors

Deligeer,Fukunaga R,Kataoka K,Yamaguchi K,Kobayashi K,Tagawa S,Suzuki S

doi

10.1016/s0162-0134(02)00442-7

subject

Has Abstract

pub_date

2002-07-25 00:00:00

pages

132-8

issue

1

eissn

0162-0134

issn

1873-3344

pii

S0162013402004427

journal_volume

91

pub_type

杂志文章

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