Department of Chemistry and Biochemistry, University of Texas, Austin 78712, USA.
A standard chromogenic assay for phosphatidylcholine determination has been modified in the development of a facile method for measuring the rate parameters (Km and Vmax) for phosphatidylcholine-preferring phospholipase C from Bacillus cereus (PLCBc). The assay is applied to the determination of the Ki for a known inhibitor of PLCBc.