title: Amino acid sequence of penicillopepsin. IV. Myxobacter AL-1 protease II and Staphylococcus aureus protease fragments and homology with pig pepsin and chymosin.
abstract: The digest of penicillopepsin (EC 3.4.23.7) with protease II from Myxobacter AL-1 gave five fragments which were separated on a Biogel P-100 column in 70% formic acid. The fragments were from 16 to 125 amino acids long. Two fragments were also isolated from a digest with a protease from Staphylococcus aureus. The analysis of these fragments by automatic sequencer gave a number of overlaps of the chymotryptic and thermolytic peptides. The available amino acid sequence data for penicillopepsin described in this paper and the accompanying papers (Kurosky, A. and Hofmann, T.:Can. J. Biochem. 54, 872 (1976);Rao, L and Hofmann, T.:Can. J. Biochem.54,885 (1976); Harris, C.I.,Rao, L., Shutsa, P., Kurosky, A. and Hofmann, T.: Can. J. Biochem. 54,895 (1976) have been combined and yield 15 fragments which range in lengths from 3 to 112 amino acid residues. These unique fragments account for virtually all the amino acids of the fungal protease. Four of the fragments with a total of 194 residues (about 60% of the molecule) have been aligned with corresponding sections of pig pepsin (EC 3.4.23.1) and with part of the N-terminal sequence available for calf chymosin (EC 3.4.23.4). In the alignments about 37% of the residues in the fungal enzyme are identical with at least one of the mammalian enzymes. An additional 20% are chemically similar. These results, together with previously reported active site directed modifications, show conclusively that penicillopepsin is an evolutionary homologue of the mammalian acid proteases.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D012085:Chymosin; D010450:Endopeptidases; D009231:Myxococcales / Q000201:enzymology; D010406:Penicillins; D010434:Pepsin A; D010447:Peptide Hydrolases; D013045:Species Specificity; D013211:Staphylococcus aureus / Q000201:enzymology; D013552:Swine
chemical_list: D000596:Amino Acids; D010406:Penicillins; D010450:Endopeptidases; D010447:Peptide Hydrolases; D010434:Pepsin A; D012085:Chymosin