methionine adenosyltransferase

(redirected from methionine-activating enzyme)

me·thi·o·nine a·den·o·syl·trans·fer·ase

an enzyme catalyzing the condensation of l-methionine and ATP, forming S-adenosyl-l-methionine, orthophosphate, and pyrophosphate; a deficiency of the hepatic enzyme will result in hypermethionemia.
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