The complete amino acid sequence of prochymosin.

Abstract
The total sequence of 365 amino acid residues in bovine prochymosin is presented. Alignment with the amino acid sequence of porcine pepsinogen shows that 204 amino acid residues are common to the 2 zymogens. Further comparison and alignment with the amino acid sequence of penicillopepsin shows that 66 residues are located at identical positions in all 3 proteases. The 3 enzymes belong to a large group of proteases with 2 aspartate residues in the active center. This group forms a family derived from one common ancestor.