title: Digestion by pancreatic juice of a beta-casomorphin-containing fragment of buffalo beta-casein.
abstract: Degradation by pig pancreatic juice of a beta-casomorphin-containing fragment (tryptic peptide corresponding to residues 49-68 of buffalo beta-casein) was investigated. The FAB/MS (fast atom bombardment mass spectrometry) technique was used to identify the fragments produced by the concerted action of pancreatic proteases. Pancreatic juice, under our experimental conditions, is not able to release beta-casomorphins or morphiceptin from the tryptic peptide sequence. Furthermore, the present report shows that the rapid hydrolysis of a peptide bond by a single protease can prevent the cleavage of peptide bonds by a different protease. Therefore the formation of some peptides in the gastrointestinal tract can depend on the protease ratio.
authors.forename: P
authors.initials: P
authors.lastname: Petrilli
authors.forename: P
authors.initials: P
authors.lastname: Pucci
authors.forename: J P
authors.initials: JP
authors.lastname: Pelissier
authors.forename: F
authors.initials: F
authors.lastname: Addeo
mesh_terms: D000818:Animals; D002020:Buffaloes / Q000378:metabolism*; D002364:Caseins / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D002918:Chymotrypsin / Q000378:metabolism; D004723:Endorphins / Q000378:metabolism*; D013058:Mass Spectrometry; D010189:Pancreatic Juice / Q000201:enzymology*; D010446:Peptide Fragments / Q000032:analysis; D010447:Peptide Hydrolases / Q000378:metabolism
chemical_list: D002364:Caseins; D004723:Endorphins; D010446:Peptide Fragments; C021968:beta-casomorphins; D010447:Peptide Hydrolases; D002918:Chymotrypsin