Glutaredoxins Play an Important Role in the Redox Homeostasis and Symbiotic Capacity of Azorhizobium caulinodans ORS571

文献类型： 外文期刊

第一作者： Cao, Yajun

作者： Cao, Yajun;Li, Mingxu;Fang, Xingxing;Zhu, Dan;Qiu, Wei;Zhu, Juanjuan;Zhong, Zengtao;Zhu, Jun;Jiang, Gaofei;Xu, Yangchun;Yu, Daogeng

作者机构：

关键词： Azorhizobium caulinodans; glutaredoxin; ROS; symbiosis

期刊名称：MOLECULAR PLANT-MICROBE INTERACTIONS （ 影响因子：4.171； 五年影响因子：4.836 ）

ISSN： 0894-0282

年卷期： 2020 年 33 卷 12 期

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收录情况： SCI

摘要： Glutaredoxin (GRX) plays an essential role in the control of the cellular redox state and related pathways in many organisms. There is limited information on GRXs from the model nitrogen (N-2)-fixing bacterium Azorhizobium caulinodans. In the present work, we identified and performed functional analyses of monothiol and dithiol GRXs in A. caulinodans in the free-living state and during symbiosis with Sesbania rostrata. Our data show that monothiol GRXs may be very important for bacterial growth under normal conditions and in response to oxidative stress due to imbalance of the redox state in grx mutants of A. caulinodans. Functional redundancies were also observed within monothiol and dithiol GRXs in terms of different physiological functions. The changes in catalase activity and iron content in grx mutants were assumed to favor the maintenance of bacterial resistance against oxidants, nodulation, and N2 fixation efficiency in this bacterium. Furthermore, the monothiol GRX12 and dithiol GRX34 play a collective role in symbiotic associations between A. caulinodans and Sesbania rostrata. Our study provided systematic evidence that further investigations are required to understand the importance of glutaredoxins in A. caulinodans and other rhizobia.

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