Protonmotive pathways and mechanisms in the cytochrome bc1 complex.

Abstract:

:The cytochrome bc(1) complex catalyzes electron transfer from ubiquinol to cytochrome c by a protonmotive Q cycle mechanism in which electron transfer is linked to proton translocation across the inner mitochondrial membrane. In the Q cycle mechanism proton translocation is the net result of topographically segregated reduction of quinone and reoxidation of quinol on opposite sides of the membrane, with protons being carried across the membrane as hydrogens on the quinol. The linkage of proton chemistry to electron transfer during quinol oxidation and quinone reduction requires pathways for moving protons to and from the aqueous phase and the hydrophobic environment in which the quinol and quinone redox reactions occur. Crystal structures of the mitochondrial cytochrome bc(1) complexes in various conformations allow insight into possible proton conduction pathways. In this review we discuss pathways for proton conduction linked to ubiquinone redox reactions with particular reference to recently determined structures of the yeast bc(1) complex.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Hunte C,Palsdottir H,Trumpower BL

doi

10.1016/s0014-5793(03)00391-0

keywords:

subject

Has Abstract

pub_date

2003-06-12 00:00:00

pages

39-46

issue

1

eissn

0014-5793

issn

1873-3468

pii

S0014579303003910

journal_volume

545

pub_type

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