Glutaredoxins Play an Important Role in the Redox Homeostasis and Symbiotic Capacity of Azorhizobium caulinodans ORS571
文献类型： 外文期刊
作者： Cao, Yajun 1 ; Jiang, Gaofei 2 ; Li, Mingxu 1 ; Fang, Xingxing 1 ; Zhu, Dan 1 ; Qiu, Wei 1 ; Zhu, Juanjuan 1 ; Yu, Daogen 1 ;
作者机构： 1.Nanjing Agr Univ, Coll Life Sci, Dept Microbiol, Nanjing 210095, Peoples R China
2.Nanjing Agr Univ, Natl Engn Res Ctr Organ Based Fertilizers, Jiangsu Collaborat Innovat Ctr Solid Organ Waste, Jiangsu Prov Key Lab Organ Solid Waste Utilizat,P, Nanjing 210095, Peoples R China
3.Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Inst, Danzhou 571737, Hainan, Peoples R China
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
页码：
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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