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Proteome Analysis of a M. avium Mutant Exposes a Novel Role of the Bifunctional Protein LysX in the Regulation of Metabolic Activity.
Journal of Infectious Diseases 2018 June 21
Lysyl-phosphatidylglycerol is one of the components of the mycobacterial membrane that contributes to the resistance to cationic antimicrobial peptides, a host-induced frontline defense against invading pathogens. Its production is catalyzed by LysX, a bifunctional protein with lysyl transferase and lysyl transfer RNA synthetase activity. Comparative proteome analysis of a lysX mutant of Mycobacterium avium strain 104 and the wild type indicated that the lysX mutant strain undergoes a transition in phenotype by switching the carbon metabolism to β-oxidation of fatty acids, along with accumulation of lipid inclusions. Surprisingly, proteins associated with intracellular survival were upregulated in the lysX mutant, even during extracellular growth, preparing bacteria for the conditions occurring inside host cells. In line with this, the lysX mutant exhibited enhanced intracellular growth in human-blood-derived monocytes. Thus, our study exposes the significance of lysX in the metabolism and virulence of the environmental pathogen M. avium hominissuis.
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