Peptide



A compound (or combination) of two or more amino acids, the building blocks of proteins. These amino acids are chained together by peptide bonds, a special kind of linkage between the nitrogen atom of one amino acid and the carboxyl carbon atom of another. Enzymes are made up of chains of these amino acids linked by peptide bonds. Or, to put it another way, enzymes are made up of chains of polypeptides (multiple peptides).