title: Peptide mapping of bovine pancreatic ribonuclease A by reverse-phase high-performance liquid chromatography. I. Application to the reduced and S-carboxymethylated protein.
abstract: Complete peptide maps of reduced and S-carboxymethylated ribonuclease A were obtained by reverse-phase high-performance liquid chromatography with the following peptide-chain cleavage techniques: cyanogen bromide cleavage, limited and extensive Staphylococcus aureus protease digestion, tryptic digestion, and tryptic followed by chymotryptic digestion. Commercial samples of S. aureus protease exhibited a broader specificity than had previously been reported, as demonstrated by its ability to cleave after glutamine residues. Cleavage after asparagine and serine residues was also strongly implicated. The procedures developed require roughly 0.1 to 1 mg of ribonuclease A for the peptide mapping of this protein. These procedures will be useful for the identification of the sites of a chemical modification and also for the isolation of a variety of peptides for further studies.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002417:Cattle; D055598:Chemical Phenomena; D002621:Chemistry; D002851:Chromatography, High Pressure Liquid; D002918:Chymotrypsin; D003488:Cyanogen Bromide; D010450:Endopeptidases; D006868:Hydrolysis; D008666:Metalloendopeptidases; D010446:Peptide Fragments / Q000032:analysis; D012259:Ribonuclease, Pancreatic; D014357:Trypsin
chemical_list: D000596:Amino Acids; D010446:Peptide Fragments; D012259:Ribonuclease, Pancreatic; D010450:Endopeptidases; D002918:Chymotrypsin; D014357:Trypsin; D008666:Metalloendopeptidases; C022653:auR protein, Staphylococcus aureus; D003488:Cyanogen Bromide