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Amino acid - Wikipedia, the free encyclopedia (1731 words) |
 | Amino acid residue is what is left of an amino acid once a water molecule has been lost (an H+ from the nitrogenous side and an OH- from the carboxylic side) in the formation of a peptide bond. |
| Many amino acids are used to synthesize other molecules, such as tryptophan which is a precursor of the neurotransmitter serotonin, and glycine which is one of the reactants in the synthesis of porphyrins such as heme. |
| In humans, the essential amino acids are lysine, leucine, isoleucine, methionine, phenylalanine, threonine, tryptophan, valine, and (in children) histidine and arginine. |
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