title: Activity of secreted Kunitz domain 1 variants of tissue factor pathway inhibitor.
abstract: Tissue factor pathway inhibitors (TFPI and TFPI-2) are Kunitz domain-type serine protease inhibitors which inhibit factor VIIa/tissue factor (VIIa/TF) complexes in a factor Xa-dependent manner. The VIIa/TF and Xa inhibitory activity has been localized to the first two Kunitz domains, respectively. Unlike TFPI, TFPI-2 has been reported to exhibit significant Xa-independent VIIa/TF inhibitory activity, perhaps due to an arginine at the P1 residue in the first Kunitz domain of TFPI-2 as opposed to a lysine at the comparable residue in TFPI. Two domain TFPI variants, differing in the first Kunitz domain but containing the second Kunitz domain of TFPI, were constructed and secreted by Saccharomyces cerevisiae in order to test the possibility that a TFPI first Kunitz domain with a P1 lysine to arginine change or a hybrid containing the TFPI-2 first Kunitz domain may represent more potent VIIa/TF inhibitors. When yeast supernatants were analyzed for specific activity in the Xa-dependent inhibition of VIIa/TF, neither variant was as active as the truncated TFPI.
authors.affiliation: Chiron Technologies, Chiron Corporation, Emeryville, CA 94608, USA.
authors.forename: K
authors.initials: K
authors.lastname: Johnson
authors.forename: I
authors.initials: I
authors.lastname: Zaror
authors.forename: D
authors.initials: D
authors.lastname: Bauer
authors.forename: Y
authors.initials: Y
authors.lastname: Choi
authors.forename: A
authors.initials: A
authors.lastname: Creasey
authors.forename: M
authors.initials: M
authors.lastname: Innis
mesh_terms: D007611:Aprotinin / Q000378:metabolism; D001777:Blood Coagulation; D015942:Factor VIIa / Q000037:antagonists & inhibitors*; D065427:Factor Xa Inhibitors; D006801:Humans; D008074:Lipoproteins / Q000378:metabolism* / Q000494:pharmacology; D011994:Recombinant Proteins / Q000378:metabolism; D012441:Saccharomyces cerevisiae
chemical_list: D065427:Factor Xa Inhibitors; D008074:Lipoproteins; D011994:Recombinant Proteins; C051928:lipoprotein-associated coagulation inhibitor; C098973:recombinant Kunitz protease inhibitor; D007611:Aprotinin; D015942:Factor VIIa