title: Studies on synthetic peptide substrates for F XII enzymes.
abstract: Screening of chromogenic peptide substrates have shown that FXIIa readily splits substrates of D-Pro-Phe-Arg-pNA (S-2302) and -Gly-Arg-pNA (e.g. S-2222) types. The latter type is preferred in a system where kallikrein is present. By using the substrate S-2222 a method for the determination of beta FXIIa inhibitors has been designed. Chromatography data show that C1-esterase inhibitor is the major inhibitor of beta FXIIa in plasma. Preliminary studies have also been performed on the assay of FXII in human plasma. The procedure to obtain a complete activation of FXII has still to be studied.
mesh_terms: D004151:Dipeptides; D005174:Factor XII / Q000378:metabolism*; D006801:Humans; D007610:Kallikreins / Q000097:blood; D009842:Oligopeptides; D013379:Substrate Specificity
chemical_list: D004151:Dipeptides; D009842:Oligopeptides; D005174:Factor XII; D007610:Kallikreins