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： Fanyang Lv;Yuhua Zhan;Wei Lu;Xiubin Ke;Yahui Shao;Yiyuan Ma;Juan Zheng;Zhimin Yang;Shanshan Jiang;Liguo Shang;Yao Ma;Lei Cheng;Claudine Elmerich;Yongliang Yan;Min Lin
作者机构：
关键词： plant biology;Plant genetics;plant nutrition
期刊名称： iScience
ISSN： 2589-0042
年卷期： 2022 年 25 卷 12 期
页码：
收录情况： SCIE（2023版）
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. However, 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 favorable substrate citrate, and ultimately glucose. Furthermore, the Hfq/Crc/CrcZY regulatory system orchestrates this preference and contributes to optimal nitrogenase activity and efficient root colonization. Hfq has a central role in this regulatory 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 mechanism linking carbon metabolism to nitrogen fixation and root colonization, which may confer rhizobacteria competitive advantages in rhizosphere environments.
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