S-aden·o·syl·me·thi·o·nine also aden·o·syl·me·thi·o·nine (.es-)ə-.den-ə-.sil-mə-'thī-ə-.nēn, (.es-).ad-ən-ə-.sil- n 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
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S-aden·o·syl·me·thi·o·nine (ə-den″o-səl-mə-thiґo-nēn) a reaction product of ATP and methionine in which the sulfur atom of methionine is bound to the ribose of adenosine; it serves as a methyl donor in transmethylation reactions.Medical dictionary. 2011.