Ion translocation by the Escherichia coli NADH:ubiquinone oxidoreductase (complex I).

Abstract:

:The energy-converting NADH:ubiquinone oxidoreductase, also known as respiratory complex I, couples the transfer of electrons from NADH to ubiquinone with the translocation of ions across the membrane. It was assumed that the complex exclusively works as a proton pump. Recently, it has been proposed that complex I from Klebsiella pneumoniae and Escherichia coli work as Na+ pumps. We have used an E. coli complex I preparation to determine the type of ion(s) translocated by means of enzyme activity, generation of a membrane potential and redox-induced Fourier-transform infrared spectroscopy. We did not find any indications for Na+ translocation by the E. coli complex I.

journal_name

Biochem Soc Trans

authors

Friedrich T,Stolpe S,Schneider D,Barquera B,Hellwig P

doi

10.1042/BST0330836

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

836-9

issue

Pt 4

eissn

0300-5127

issn

1470-8752

pii

BST0330836

journal_volume

33

pub_type

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