title: Enhancement of catalytic activities of serine proteases by tripeptides compounds.
abstract: The tripeptide compounds, Glu-Arg-Pro-amide (ERPm), D-Pro-Thr-Trp-amide (dPTWm) and thioproline-Thr-Trp (tPTW), were obtained by screening of synthetic peptides for growth-inhibitory activity toward cultured transformed cells. The effects of these peptide compounds on proteases were investigated and the results showed that these compounds enhanced the amidolytic activity of serine proteases despite the fact that each reaction was carried out under optimal conditions. ERPm stimulated the activities of trypsin, chymotrypsin, thrombin, plasmin urokinase and elastase. dPTWm also showed similar effects except that toward chymotrypsin. tPTW elevated the activity only of trypsin, chymotrypsin and thrombin. Stimulation of trypsin activity by these compounds was also confirmed by using casein as a substrate. None of these compounds affected the amidolytic activities of metalloproteinases (MMP-1 and MMP-9), cysteine proteinases (m- and mu-calpains, cathepsin B and papain) or an exopeptidase (leucine aminopeptidase). The activation was at least partly due to the stabilization of the catalytic activity of proteases as well as prevention of autolysis.
authors.affiliation: Division of Biochemistry, Chiba Cancer Center Research Institute, Japan.thiwasa@biolab.kazusa.or.jp
authors.forename: T
authors.initials: T
authors.lastname: Hiwasa
authors.forename: S
authors.initials: S
authors.lastname: Ogawa
authors.forename: H
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Ike
mesh_terms: D000595:Amino Acid Sequence; D002364:Caseins / Q000378:metabolism; D002918:Chymotrypsin / Q000187:drug effects / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004795:Enzyme Stability; D005341:Fibrinolysin / Q000187:drug effects / Q000378:metabolism; D008969:Molecular Sequence Data; D010455:Peptides / Q000494:pharmacology*; D012697:Serine Endopeptidases / Q000187:drug effects* / Q000378:metabolism*; D014357:Trypsin / Q000187:drug effects / Q000378:metabolism; D014568:Urokinase-Type Plasminogen Activator / Q000187:drug effects / Q000378:metabolism
chemical_list: D002364:Caseins; D010455:Peptides; D012697:Serine Endopeptidases; D002918:Chymotrypsin; D014357:Trypsin; D005341:Fibrinolysin; D014568:Urokinase-Type Plasminogen Activator