Polypeptide A polymer composed of amino acids linked by peptide bonds

Polypeptide A polymer composed of amino acids linked by peptide bonds. [Pg.1098]

Polypeptides are polymers composed of amino acids linked by peptide bonds. The order of the amino acids in a polypeptide is called the amino acid sequence. Disulfide bridges, formed by the oxidation of cysteine residues, are an important structural element in polypeptides and proteins. [Pg.126]

PEPTIDE BOND FORMATION Polypeptides are linear polymers composed of amino acids linked together by peptide bonds. Peptide bonds (Figure 5.11) are amide linkages formed when the unshared electron pair of the a-ami no nitrogen atom of one amino acid attacks the a-carboxyl carbon of another in a nucleophilic acyl substitution reaction. A generalized acyl substitution reaction is shown ... [Pg.123]