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Insights into the recognition and electron transfer steps in nitric oxide reductase from Marinobacter hydrocarbonoclasticus.

Abstract：

:Marinobacter hydrocarbonoclasticus nitric oxide reductase, cNOR, is an integral membrane protein composed of two subunits with different roles, NorC (electron transfer) and NorB (catalytic) that receives electrons from the soluble cytochrome c552 and reduces nitric oxide to nitrous oxide in the denitrification pathway. The solvent-exposed domain of NorC, harboring a c-type heme was heterologously produced, along with its physiological electron donor, cytochrome c552. These two proteins were spectroscopically characterized and shown to be similar to the native proteins, both being low-spin and Met-His coordinated, with the soluble domain of NorC presenting some additional features of a high-spin heme, which is consistent with the higher solvent accessibility of its heme and weaker coordination of the methionine axial ligand. The electron transfer complex between the two proteins has a 1:1 stoichiometry, and an upper limit for the dissociation constant was estimated by 1H NMR titration to be 1.2±0.4μM. Electrochemical techniques were used to characterize the interaction between the proteins, and a model structure of the complex was obtained by molecular docking. The electrochemical observations point to the modulation of the NorC reduction potential by the presence of NorB, tuning its ability to receive electrons from cytochrome c552.

journal_name

J Inorg Biochem

journal_title

Journal of inorganic biochemistry

authors

Ramos S,Almeida RM,Cordas CM,Moura JJG,Pauleta SR,Moura I

doi

10.1016/j.jinorgbio.2017.09.001

subject

Has Abstract

pub_date

2017-12-01 00:00:00

pages

402-411

eissn

0162-0134

issn

1873-3344

pii

S0162-0134(17)30368-9

journal_volume

177

pub_type

杂志文章

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