where does the energy to form a peptide bond come from
Peptide bond The formation of the peptide bond consumes energy, which, in living systems, is derived from ATP.[6] 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.[7][8]