Transport of Na(+) and K (+) by an antiporter-related subunit from the Escherichia coli NADH dehydrogenase I produced in Saccharomyces cerevisiae.
Arch Microbiol
; 188(5): 509-21, 2007 Nov.
Article
en En
| MEDLINE
| ID: mdl-17583799
ABSTRACT
The NADH dehydrogenase I from Escherichia coli is a bacterial homolog of the mitochondrial complex I which translocates Na(+) rather than H(+). To elucidate the mechanism of Na(+) transport, the C-terminally truncated NuoL subunit (NuoL(N)) which is related to Na(+)/H(+) antiporters was expressed as a protein A fusion protein (ProtA-NuoL(N)) in the yeast Saccharomyces cerevisiae which lacks an endogenous complex I. The fusion protein inserted into membranes from the endoplasmatic reticulum (ER), as confirmed by differential centrifugation and Western analysis. Membrane vesicles containing ProtA-NuoL(N) catalyzed the uptake of Na(+) and K(+) at rates which were significantly higher than uptake by the control vesicles under identical conditions, demonstrating that ProtA-NuoL(N) translocated Na(+) and K(+) independently from other complex I subunits. Na(+) transport by ProtA-NuoL(N) was inhibited by EIPA (5-(N-ethyl-N-isopropyl)-amiloride) which specifically reacts with Na(+)/H(+) antiporters. The cation selectivity and function of the NuoL subunit as a transporter module of the NADH dehydrogenase complex is discussed.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Potasio
/
Saccharomyces cerevisiae
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Sodio
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Intercambiadores de Sodio-Hidrógeno
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Proteínas de Escherichia coli
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Complejo I de Transporte de Electrón
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Escherichia coli
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NADH Deshidrogenasa
Idioma:
En
Revista:
Arch Microbiol
Año:
2007
Tipo del documento:
Article
País de afiliación:
Suiza