Mechanism of low oxygen tolerance in Azorhizobium caulinodans

茎瘤固氮根瘤菌（Azorhizobium caulinodans）是热带豆科植物长喙田菁（Sesbania rostrata）的一种微共生菌，在茎上形成固氮根瘤。本研究揭示了编码内膜蛋白的ocmA基因与A.茎节植物。Lon蛋白酶也参与了胞外多糖的产生。此外，发现Lon蛋白酶参与抑制reb基因，这与该细菌的杀伤特性有关。

Azorhizobium caulinodans is a microsymbiont of a tropical legume, Sesbania rostrata, and forms nitrogen fixing nodules on the stems. In this study, it was revealed that ocmA gene, which was predicted to encode an inner membrane protein, was related to production of exopolysaccharides in A. caulinodans. It was also revealed that Lon protease was involved in production of exopolysaccharides. Furthermore, Lon protease was found to be involved in suppression of reb genes, which is related to killer trait of this bacterium.