Dipeptides are amino acids blocked with an acetyl and an N-methyl group. The amino acids in dipeptides have structural properties similar to amino acid residues in proteins; this is why structures of dipeptides are important for understanding structures of proteins. We have determined the dipeptide structures of 19 basic amino acids in a water solution. Using spectroscopic methods, we have demonstrated the presence of three conformations of dipeptides in water: the PII, ß, and the ?R. The proportion of the ?R conformation in all dipeptides is surprisingly low (< 10%).
COBISS.SI-ID: 4611098