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Alr0397 is an outer membrane transporter for the siderophore schizokinen in Anabaena sp. strain PCC 7120

Opened Access Alr0397 is an outer membrane transporter for the siderophore schizokinen in Anabaena sp. strain PCC 7120

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Autor: Nicolaisen, Kerstin
Moslavac, Suncana
Samborski, Anastazia
Valdebenito, Marianne
Hantke, Klaus
Maldener, Iris
Muro Pastor, Alicia María
Flores García, Enrique
Schleiff, Enrico
Departamento: Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular
Fecha: 2008
Publicado en: Journal of Bacteriology, 190 (22), 7500-7507.
Tipo de documento: Artículo
Resumen: Iron uptake in proteobacteria by TonB-dependent outer membrane transporters represents a well-explored subject. In contrast, the same process has been scarcely investigated in cyanobacteria. The heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120 is known to secrete the siderophore schizokinen, but its transport system has remained unidentified. Inspection of the genome of strain PCC 7120 shows that only one gene encoding a putative TonB-dependent iron transporter, namely alr0397, is positioned close to genes encoding enzymes involved in the biosynthesis of a hydroxamate siderophore. The expression of alr0397, which encodes an outer membrane protein, was elevated under iron-limited conditions. Inactivation of this gene caused a moderate phenotype of iron starvation in the mutant cells. The characterization of the mutant strain showed that Alr0397 is a TonB-dependent schizokinen transporter (SchT) of the outer membrane and that alr0397 expression and schizokinen production a...
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Cita: Nicolaisen, K., Moslavac, S., Samborski, A., Valdebenito, M., Hantke, K., Maldener, I.,...,Schleiff, E. (2008). Alr0397 is an outer membrane transporter for the siderophore schizokinen in Anabaena sp. strain PCC 7120. Journal of Bacteriology, 190 (22), 7500-7507.
Tamaño: 774.9Kb
Formato: PDF

URI: http://hdl.handle.net/11441/62909

DOI: 10.1128/JB.01062-08

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