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A gene cluster involved in metal homeostasis in the cyanobacterium Synechocystis sp. strain PCC 6803

Opened Access A gene cluster involved in metal homeostasis in the cyanobacterium Synechocystis sp. strain PCC 6803

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Autor: García Domínguez, Mario
López Maury, Luis
Florencio Bellido, Francisco Javier
Reyes Rosa, José Carlos
Departamento: Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular
Fecha: 1999
Publicado en: Journal of Bacteriology, 182 (6), 1507-1514.
Tipo de documento: Artículo
Resumen: A gene cluster composed of nine open reading frames (ORFs) involved in Ni2+, Co2+, and Zn2+ sensing and tolerance in the cyanobacterium Synechocystis sp. Strain PCC 6803 has been identified. The cluster includes an Ni2+ response operon and a Co2+ response system, as well as a Zn2+ response system previously described. Expression of the Ni2+ response operon (nrs) was induced in the presence of Ni2+ and Co2+. Reduced Ni2+ tolerance was observed following disruption of two ORFs of the operon (nrsA and nrsD). We also show that the nrsD gene encodes a putative Ni2+ permease whose carboxy-terminal region is a metal binding domain. The Co2+ response system is composed of two divergently transcribed genes, corR and corT, mutants of which showed decreased Co2+ tolerance. Additionally, corR mutants showed an absence of Co2+-dependent induction of corT, indicating that CorR is a transcriptional activator of corT. To our knowledge, CorR is the first Co2+-sensing transcription factor described. Ou...
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Cita: García Domínguez, M., López Maury, L., Florencio Bellido, F.J. y Reyes Rosa, J.C. (200-). A gene cluster involved in metal homeostasis in the cyanobacterium Synechocystis sp. strain PCC 6803. Journal of Bacteriology, 182 (6), 1507-1514.
Tamaño: 2.618Mb
Formato: PDF

URI: http://hdl.handle.net/11441/63095

DOI: 10.1128/JB.182.6.1507-1514.2000

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