Fur is involved in manganese-dependent regulation of mntA (sitA) expression in Sinorhizobium meliloti

Applied and Environmental Microbiology
Raúl PlateroElena Fabiano

Abstract

Fur is a transcriptional regulator involved in iron-dependent control of gene expression in many bacteria. In this work we analyzed the phenotype of a fur mutant in Sinorhizobium meliloti, an alpha-proteobacterium that fixes N(2) in association with host plants. We demonstrated that some functions involved in high-affinity iron transport, siderophore production, and iron-regulated outer membrane protein expression respond to iron in a Fur-independent manner. However, manganese-dependent expression of the MntABCD manganese transport system was lost in a fur strain as discerned by constitutive expression of a mntA::gfp fusion reporter gene in the mutant. Thus, Fur directly or indirectly regulates a manganese-dependent function. The data indicate a novel function for a bacterial Fur protein in mediating manganese-dependent regulation of gene expression.

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Feb 2, 2006·Current Microbiology·Anuradha AlahariDaniel Le Rudulier
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