Regulation of hierarchical carbon substrate utilization, nitrogen fixation, and root colonization by the Hfq/Crc/CrcZY genes in Pseudomonas stutzeri
文献类型： 外文期刊
作者： Lv, Fanyang 1 ; Zhan, Yuhua 1 ; Lu, Wei 1 ; Ke, Xiubin 1 ; Shao, Yahui 1 ; Ma, Yiyuan 1 ; Zheng, Juan 1 ; Yang, Zhimin 1 ; Jiang, Shanshan 1 ; Shang, Liguo 1 ; Ma, Yao 1 ; Cheng, Lei 2 ; Elmerich, Claudine 3 ; Yan, Yongliang 1 ; Lin, Min 1 ;
作者机构： 1.Chinese Acad Agr Sci, Biotechnol Res Inst, Key Lab Agr Microbiome MARA, Beijing, Peoples R China
2.Biogas Inst, Key Lab Dev & Applicat Rural Renewable Energy, Minist Agr & Rural Affairs, Chengdu, Peoples R China
3.Inst Pasteur, Paris, France
期刊名称：ISCIENCE （ 影响因子：6.107； 五年影响因子：6.233 ）
ISSN：
年卷期： 2022 年 25 卷 12 期
页码：
收录情况： SCI
摘要： Bacteria of the genus Pseudomonas consume preferred carbon substrates in nearly reverse order to that of enterobacteria, and this process is controlled by RNA-binding translational repressors and regulatory ncRNA antagonists. Howev-er, their roles in microbe-plant interactions and the underlying mechanisms remain uncertain. Here we show that root-associated diazotrophic Pseudomonas stutzeri A1501 preferentially catabolizes succinate, followed by the less favor-able substrate citrate, and ultimately glucose. Furthermore, the Hfq/Crc/CrcZY regulatory system orchestrates this preference and contributes to optimal nitro-genase activity and efficient root colonization. Hfq has a central role in this regu-latory network through different mechanisms of action, including repressing the translation of substrate-specific catabolic genes, activating the nitrogenase gene nifH posttranscriptionally, and exerting a positive effect on the transcription of an exopolysaccharide gene cluster. Our results illustrate an Hfq-mediated mech-anism linking carbon metabolism to nitrogen fixation and root colonization, which may confer rhizobacteria competitive advantages in rhizosphere environments.
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