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| | In Vitro Factor XIa Enzyme assay |
| Description: | Inhibitory activities of compounds of the present invention against factor XIa, Xa, XIIa, IXa, VIIa, plasma kallikrein or thrombin were evaluated using appropriate purified proteases and synthetic substrates. The rate of hydrolysis of the chromogenic substrate by the relevant protease was continuously measured at 405 nm. Inhibitory activity against each enzyme was calculated as % inhibition using the equation described below. % Inhibition=[[(rate without compound)−(rate with compound)]/(rate without compound)]×100%. Each half maximal inhibitory concentration (IC50) value was determined by plotting the concentration of compound of the invention against the % inhibition.Human Factor XIa (Haematologic Technologies Inc.) activity was measured at an enzyme concentration of 0.1 U/mL in 150 mM NaCl, 5 mM KCl, 1 mg/mL PEG6000, 50 mM HEPES-NaOH (pH7.4) with 300 μM S-2366 (pyroGlu-Pro-Arg-pNA, Chromogenix). |
| Affinity data for this assay | |
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