<P> The formation of the peptide bond consumes energy , which , in living systems , is derived from ATP . Polypeptides and proteins are chains of amino acids held together by peptide bonds . Living organisms employ enzymes to produce polypeptides , and ribosomes to produce proteins . Peptides are synthesized by specific enzymes . For example , the tripeptide glutathione is synthesized in two steps from free amino acids , by two enzymes : gamma - glutamylcysteine synthetase and glutathione synthetase . </P>
<P> The formation of the peptide bond consumes energy , which , in living systems , is derived from ATP . Polypeptides and proteins are chains of amino acids held together by peptide bonds . Living organisms employ enzymes to produce polypeptides , and ribosomes to produce proteins . Peptides are synthesized by specific enzymes . For example , the tripeptide glutathione is synthesized in two steps from free amino acids , by two enzymes : gamma - glutamylcysteine synthetase and glutathione synthetase . </P>
where does the energy to form a peptide bond come from
where does the energy to form a peptide bond come from
ATP
ATP