Work

The protonmotive Q cycle. Energy transduction by coupling of proton translocation to electron transfer by the cytochrome bc1 complex.

Year: 1990

Type: article

Abstract: The cytochrome bcl complex is an oligomeric membrane protein complex which is a component of the mitochondrial respiratory chain and of the electron transfer chains of nu-merous bacteria which use oxygen, nitrogen, and sulfur com-pounds as terminal electron acceptors. The cytochrome bcl complex also participates in the cyclic transfer of electrons to and from the photosynthetic reaction centers in anoxygenic photosynthetic bacteria. In all of these species the cytochrome bcl complex transfers electrons from ubiquinol to cytochrome c and links this elec-tron transfer to translocation of protons across the membrane in which the bcl complex resides. The mechanism by which the cytochrome bcl complex links electron transfer to proton translocation is the protonmotive Q cycle (1). This proton-motive electron transfer is one of the most important mech-

Source: Journal of Biological Chemistry

DOI: 10.1016/s0021-9258(19)38410-8

Author: B L Trumpower

Institution: Dartmouth College

Language: English

Topic: Photosynthetic Processes and Mechanisms

Subfield: Molecular Biology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

Open Access status: hybrid

Estimated APC paid: $3,430

Funder: National Institute of General Medical Sciences