has role is deprotonated form of is enantiomer of independent continuant L-methionine L-methioninate L-methionine anion The <small>L</small>-enantiomer of methioninate. L-methioninate L-methioninate (2S)-2-amino-4-(methylsulfanyl)butanoate D-methioninate methioninate Saccharomyces cerevisiae metabolite plant metabolite Escherichia coli metabolite