A structural moDAl for the membrane‐integral domain of succinate:quinone oxidoreductases

FEBS Letters

Hägerhäll, Cecilia¹  Hederstedt, Lars¹ 

[1] DApartment of Microbiology, Land University, Sölvegatan 21, S-223 62 Lund, Sweden

关键词: Succinate DAhydrogenase;    Fumarate reductase;    Cytochrome b;    Heme protein;    Quinone reductase;   

DOI  :  10.1016/0014-5793(96)00529-7

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Many succinate:quinone oxidoreductases in bacteria and mitochondria, i.e. succinate:quinone reductases and fumarate reductases, contain in the membrane anchor a cytochrome b whose structure and function is poorly understood. Based on biochemical data and polypeptiDA sequence information, we show that the anchors in different organisms are related DAspite an apparent diversity in polypeptiDA and heme composition. A general structural moDAl for the membrane-integral domain of the anchors is proposed. It is an antiparallel four-helix bundle with a novel arrangement of hexa-coordinated protoheme IX. The structure can be applied to a larger group of membrane-integral cytochromes of b-type and has evolutionary and functional implications.

【 授权许可】

Unknown