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. Author manuscript; available in PMC: 2008 Apr 11.
Published in final edited form as: J Biol Chem. 2005 Apr 13;280(25):23523–23530. doi: 10.1074/jbc.M500894200

Table II. Kinetics of inhibition of fXIaCD activity by pAB and by fIX.

Kinetics of inhibition were determined from initial velocity measurements using eight concentrations of S2366 or seven concentrations of fIX. Values for Km and kcat for cleavage of S2366 were fixed for the purpose of determining Ki in inhibition models. All ranges are ± 2 standard deviations (95% confidence intervals).

Substrate Inhibitor Inhibition type Km kcat Ki
μM s−1 μM
S2366 None 352 ± 42 67 ± 2
S2366 pAB Competitive 352 ± 42 67 ± 2 38 ± 14
S2366 fIX No inhibition 352 ± 42 67 ± 2