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In silico analysis of theA. brasilense genome showed the presence of multiple paralogs of genes involved in oxidative stress response, which included 2 OxyR transcription regulators and 3 catalases. So far,Deinococcus radiodurans andVibrio cholerae are known to harbor two paralogs of OxyR, andSinorhizobium meliloti harbors three catalases. We do not yet know how the expression of multiple catalases is regulated in any bacterium. Here we show the role of multiple RpoH sigma factors and OxyR in regulating the expression of multiple catalases inA. brasilense Sp7. Our work gives a glimpse of systems biology ofA. brasilense used for responding to oxidative stress.

applied and environmental microbiology

Catalase Expression in Azospirillum brasilense Sp7 Is Regulated by a Network Consisting of OxyR and Two RpoH Paralogs and Including an RpoE1→RpoH5 Regulatory Cascade