Methoxy-mycolic and keto-mycolic acid synthesis enzyme

Methoxy-mycolic and keto-mycolic acid synthesis enzymes are a family of S-adenosylmethionine-dependent methyltransferases required for the functionalization of mycolic acids in *Mycobacterium tuberculosis*. These modifications—introducing methoxy and keto functions (and associated cyclopropane rings and methyl branches)—are catalyzed by distinct but structurally related enzymes, notably MmaA3 (methoxy group addition), MmaA4 (at the hydroxy branch point), and others (e.g., MmaA1, -2, -3, -4, CmaA2, PcaA). The correct composition and structure of mycolic acids are critical for cell wall integrity, natural drug resistance, and virulence. Loss or inhibition of these enzymes impairs bacterial growth, induces attenuation in animal models, and provides a mechanism for the action of some antitubercular drugs (such as thiacetazone), making them key targets for new drug development against tuberculosis

Other names

Mycolic acid methyltransferasesMycolic acid methyltransferase familyMmaA1MmaA2MmaA3MmaA4CmaA1CmaA2PcaASAM-dependent methyltransferases

Inhibition of methyltransferase activity (blocks formation of oxygenated mycolic acids, including methoxy- and keto-mycolates, which compromises cell wall integrity and impairs virulence)