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A dipeptide is an organic compound derived from two amino acids. The constituent amino acids can be the same or different. When different, two isomers of the dipeptide are possible, depending on the sequence. Several dipeptides are physiologically important, and some are both physiologically and commercially significant.
Aspartame is a methyl ester of the dipeptide of the natural amino acids L-aspartic acid and L-phenylalanine. [4] Under strongly acidic or alkaline conditions, aspartame may generate methanol by hydrolysis. Under more severe conditions, the peptide bonds are also hydrolyzed, resulting in free amino acids. [53]
Diphenylalanine is a term that has recently been used to describe the unnatural amino acid similar to the two amino acids alanine and phenylalanine.It has been used for the synthesis of pseudopeptide analogues which are capable of inhibiting certain enzymes.
Anserine (β-alanyl-3-methylhistidine) is a dipeptide containing β-alanine and 3-methylhistidine. [1] Anserine is a derivative of carnosine, which has been methylated. [2] Both anserine and carnosine chelate copper. [3] Due to its methylation, anserine is more stable in serum and resistant to degradation than carnosine. [4]
In cell culture, L-alanyl-L-glutamine is sometimes used as a replacement for L-glutamine because this dipeptide is stable in aqueous solution unlike L-glutamine which spontaneously degrades to form ammonia and pyrrolidine carboxylic acid.
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Peptide bond formation via dehydration reaction. When two amino acids form a dipeptide through a peptide bond, [1] it is a type of condensation reaction. [2] In this kind of condensation, two amino acids approach each other, with the non-side chain (C1) carboxylic acid moiety of one coming near the non-side chain (N2) amino moiety of the other.
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