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• W3134775401 startingPage "927" @default.
• W3134775401 abstract "The glyoxylate shunt is a pathway associated with the assimilation of fatty acids and is implicated in the resistance of M. tuberculosis (Mtb). Isocitrate lyase (ICL), the first enzyme in the glyoxylate shunt, mediates Mtb infections and its survival in mice via fatty acids, metabolism, and physiological functions. Here, we found that in Mycobacterium smegmatis (M. smegmatis) the two-component system SenX3-RegX3 regulated the glyoxylate shunt in response to phosphate starvation by controlling the transcription of icl. In response to phosphate availability, the phosphate regulator RegX3 directly bound to the upstream regulatory region of icl and repressed its transcription. The inactivation of regX3 increased icl transcription and ICL activity, causing a growth defect in M. smegmatis with fatty acids as the sole source of carbon and energy. The growth defect was partly due to the toxicity of the excess glyoxylate produced by ICL. A decrease in glyoxylic acid levels, overexpression of regX3, or the chemical inhibition (IA or 3-NP) of ICL restored the growth of the Regx3-deficient M. smegmatis. Thus, we established a genetic network between the phosphate stress response and glyoxylate shunt based on the amount of intracellular ICL during mycobacterial survival on short-chain fatty acids, which contributed to its antimicrobial arsenal." @default.
• W3134775401 created "2021-03-15" @default.
• W3134775401 creator A5007710627 @default.
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• W3134775401 date "2021-03-05" @default.
• W3134775401 modified "2023-10-15" @default.
• W3134775401 title "RegX3 Controls Glyoxylate Shunt and Mycobacteria Survival by Directly Regulating the Transcription of Isocitrate Lyase Gene in <i>Mycobacterium smegmatis</i>" @default.
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• W3134775401 doi "https://doi.org/10.1021/acsinfecdis.1c00067" @default.
• W3134775401 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33663204" @default.
• W3134775401 hasPublicationYear "2021" @default.
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