Alternative Complex III from phototrophic bacteria and its electron acceptor auracyanin.
Biochim Biophys Acta
; 1827(11-12): 1383-91, 2013.
Article
em En
| MEDLINE
| ID: mdl-23357331
ABSTRACT
Alternative Complex III (ACIII) is a multisubunit integral membrane protein electron transfer complex that is proposed to be an energy-conserving functional replacement for the bacterial cytochrome bc1 or b6f complexes. Clues to the structure and function of this novel complex come from its relation to other bacterial enzyme families. The ACIII complex has menaquinone electron acceptor oxidoreductase activity and contains protein subunits with multiple Fe-S centers and c-type hemes. ACIII is found in a diverse group of bacteria, including both phototrophic and nonphototrophic taxa. In the phototrophic filamentous anoxygenic phototrophs, the electron acceptor is the small blue copper protein auracyanin instead of a soluble cytochrome. Recent work on ACIII and the copper protein auracyanin is reviewed with focus on the photosynthetic systems and potential electron transfer pathways and mechanisms. Taken together, the ACIII complexes constitute a unique system for photosynthetic electron transfer and energy conservation. This article is part of a Special Issue entitled Respiratory Complex III and related bc complexes.
Palavras-chave
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Bactérias
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Proteínas de Bactérias
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Família Multigênica
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Complexo III da Cadeia de Transporte de Elétrons
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Metaloproteínas
Idioma:
En
Revista:
Biochim Biophys Acta
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos