The chemical reactions and pathways resulting in the formation of S-adenosylmethionine, S-(5'-adenosyl)-L-methionine, an important intermediate in one-carbon metabolism.
Synonyms:
exact_synonym:
S-adenosyl methionine biosynthesis; S-adenosyl methionine biosynthetic process; S-adenosylmethionine anabolism; S-adenosylmethionine biosynthesis; S-adenosylmethionine formation; S-adenosylmethionine synthesis; SAM biosynthetic process