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• W2802469892 abstract "ABSTRACT Here we demonstrated that the inhibition of electron flux through the respiratory electron transport chain (ETC) by either the disruption of the gene for the major terminal oxidase ( aa 3 cytochrome c oxidase) or treatment with KCN resulted in the induction of ald encoding alanine dehydrogenase in Mycobacterium smegmatis . A decrease in functionality of the ETC shifts the redox state of the NADH/NAD + pool toward a more reduced state, which in turn leads to an increase in cellular levels of alanine by Ald catalyzing the conversion of pyruvate to alanine with the concomitant oxidation of NADH to NAD + . The induction of ald expression under respiration-inhibitory conditions in M. smegmatis is mediated by the alanine-responsive AldR transcriptional regulator. The growth defect of M. smegmatis by respiration inhibition was exacerbated by inactivation of the ald gene, suggesting that Ald is beneficial to M. smegmatis in its adaptation and survival under respiration-inhibitory conditions by maintaining NADH/NAD + homeostasis. The low susceptibility of M. smegmatis to bcc 1 complex inhibitors appears to be, at least in part, attributable to the high expression level of the bd quinol oxidase in M. smegmatis when the bcc 1 - aa 3 branch of the ETC is inactivated. IMPORTANCE We demonstrated that the functionality of the respiratory electron transport chain is inversely related to the expression level of the ald gene encoding alanine dehydrogenase in Mycobacterium smegmatis . Furthermore, the importance of Ald in NADH/NAD + homeostasis during the adaptation of M. smegmatis to severe respiration-inhibitory conditions was demonstrated in this study. On the basis of these results, we propose that combinatory regimens including both an Ald-specific inhibitor and respiration-inhibitory antitubercular drugs such as Q203 and bedaquiline are likely to enable a more efficient therapy for tuberculosis." @default.
• W2802469892 created "2018-05-17" @default.
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• W2802469892 date "2018-07-15" @default.
• W2802469892 modified "2023-10-11" @default.
• W2802469892 title "Roles of Alanine Dehydrogenase and Induction of Its Gene in Mycobacterium smegmatis under Respiration-Inhibitory Conditions" @default.
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• W2802469892 doi "https://doi.org/10.1128/jb.00152-18" @default.
• W2802469892 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6018359" @default.
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