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Septum-localized protein required for filament integrity and diazotrophy in the heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120

Opened Access Septum-localized protein required for filament integrity and diazotrophy in the heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120

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Autor: Flores García, Enrique
Pernil, Rafael
Muro Pastor, Alicia María
Mariscal, Vicente
Maldener, Iris
Lechno Yossef, Sigal
Fan, Qing
Wolk, C. Peter
Herrero Moreno, Antonia
Departamento: Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular
Fecha: 2007
Publicado en: Journal of Bacteriology, 189 (10), 3884-3890.
Tipo de documento: Artículo
Resumen: Heterocysts, formed when filamentous cyanobacteria, such as Anabaena sp. strain PCC 7120, are grown in the absence of combined nitrogen, are cells that are specialized in fixing atmospheric nitrogen (N2) under oxic conditions and that transfer fixed nitrogen to the vegetative cells of the filament. Anabaena sp. mutants whose sepJ gene (open reading frame alr2338 at the Anabaena sp. genome) was affected showed filament fragmentation and arrested heterocyst differentiation at an early stage. In a sepJ insertional mutant, a layer similar to a heterocyst polysaccharide layer was formed, but the heterocyst-specific glycolipids were not synthesized. The sepJ mutant did not exhibit nitrogenase activity even when assayed under anoxic conditions. In contrast to proheterocysts produced in the wild type, those produced in the sepJ mutant still divided. Sepj is a multidomain protein whose N-terminal region is predicted to be periplasmic and whose C-terminal domain resembles an export permease. Us...
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Cita: Flores García, E., Pernil, R., Muro Pastor, A.M., Mariscal, V., Maldener, I., Lechno Yossef, S.,...,Herrero, A. (2007). Septum-localized protein required for filament integrity and diazotrophy in the heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120. Journal of Bacteriology, 189 (10), 3884-3890.
Tamaño: 366.9Kb
Formato: PDF

URI: http://hdl.handle.net/11441/63108

DOI: 10.1128/JB.00085-07

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