4.1.99.19 L-tyrosine + S-adenosyl-L-methionine + reduced acceptor the reductive cleavage of S-adenosyl-L-methionine yields the highly reactive 5'-deoxyadenosyl radical, which can abstract the phenolic hydrogen atom from tyrosine Escherichia coli 2-iminoacetate + 4-methylphenol + 5'-deoxyadenosine + L-methionine + acceptor + 2 H+ - ? 417199