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Defining the structural basis for assembly of a transmembrane cytochrome.

Abstract：

:To define the structural basis for cofactor binding to membrane proteins, we introduce a manageable model system, which allows us, for the first time, to study the influence of individual transmembrane helices and of single amino acid residues on the assembly of a transmembrane cytochrome. In vivo as well as in vitro analyses indicate central roles of single amino acid residues for either interaction of the transmembrane helices or for binding of the cofactor. The results clearly show that interaction of the PsbF transmembrane helix is independent from binding of the heme cofactor. On the other hand, binding of the cofactor highly depends on helix-helix interactions. By site-directed mutagenesis critical amino acid residues were identified, which are involved in the assembly of a functional transmembrane cytochrome. Especially, a highly conserved glycine residue is critical for interaction of the transmembrane helices and assembly of the cytochrome. Based on the two-stage-model of alpha-helical membrane protein folding, the presented results clearly indicate a third stage of membrane protein folding, in which a cofactor binds to a pre-assembled transmembrane protein.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Prodöhl A,Volkmer T,Finger C,Schneider D

doi

10.1016/j.jmb.2005.05.016

keywords:

subject

Has Abstract

pub_date

2005-07-22 00:00:00

pages

744-56

issue

4

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(05)00547-4

journal_volume

350

pub_type

杂志文章

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