A cytochrome c₅₅₁ mediates the cyclic electron transport chain of the anoxygenic phototrophic bacterium Roseiflexus castenholzii.

ABSTRACT: Roseiflexus castenholzii is a gram-negative filamentous phototrophic bacterium that carries out anoxygenic photosynthesis through a cyclic electron transport chain (ETC). The ETC is composed of a reaction center (RC)-light-harvesting (LH) complex (rcRC-LH); an alternative complex III (rcACIII), which functionally replaces the cytochrome bc₁/b₆f complex; and the periplasmic electron acceptor auracyanin (rcAc). Although compositionally and structurally different from the bc₁/b₆f complex, rcACIII plays similar essential roles in oxidizing menaquinol and transferring electrons to the rcAc. However, rcACIII-mediated electron transfer (which includes both an intraprotein route and a downstream route) has not been clearly elucidated, nor have the detail

SUBMITTER: Yu L 

PROVIDER: S-EPMC10873879 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature