has role is protonated form of is enantiomer of L-alpha-amino acid D-glutamic acid L-glutamic acid An optically active form of glutamic acid having <small>L</small>-configuration. ferroptosis inducer glutamic acid glutamine family amino acid neurotransmitter micronutrient L-glutamate(1-) nutraceutical mouse metabolite Escherichia coli metabolite proteinogenic amino acid