2-heptyl-1-hydroxyquinolin-4(1H)-one methyltransferase

UniProtKB accession:  P9WKL5

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UniProtKB description:  Involved in cellular response to chemical stress and may contribute to resistance toward antimicrobial natural compounds as well as drugs (Probable). Catalyzes the methylation and detoxification of the P.aeruginosa toxin 2-heptyl-1-hydroxy-4(1H)-quinolinone (HQNO) to 2-heptyl-1-methoxy-4(1H)-quinolinone (HMOQ) (PubMed:33064871). Can also methylate 3-bromo-2-heptyl-1-hydroxy-4(1H)-quinolinone, and shows much lower activity with 1-hydroxyquinolin-4(1H)-one, quercetin, 4-hydroxyquinolin-2(1H)-one (DHQ) and 4-hydroxyisoquinolin-1(2H)-one (PubMed:33064871). In addition, N-methylates and abolishes the mycobactericidal activity of 3-methyl-1-oxo-2-[3-oxo-3-(pyrrolidin-1-yl)propyl]-1,5-dihydrobenzo[4,5]imidazo[1,2-a]pyridine-4-carbonitrile (compound 14), an inhibitor of DprE1 (PubMed:27432954). Also methylates and reduces the inhibitory effect of TPSA (2-[5-(2-{[4-(2-thienyl)-2-pyrimidinyl]sulfanyl}acetyl)-2-thienyl]acetic acid), an inhibitor of GlmU acetyltransferase (PubMed:31380295).