S-adenosylmethionine

noun

S-aden·​o·​syl·​me·​thi·​o·​nine

variants also adenosylmethionine

(ˌes-)ə-ˌden-ə-ˌsil-mə-ˈthī-ə-ˌnēn, (ˌes-)ˌad-ᵊn-ə-ˌsil-

: the active sulfonium form of methionine C₁₅H₂₂N₆O₅S that acts as a methyl group donor in various biochemical transmethylation reactions (as the formation of epinephrine or creatine), that is formed when methionine reacts with ATP, and that is an intermediate in the formation of homocysteine see same