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Two novel extracellular cholesterol oxidases designated CO1 and CO2, from Bacillus sp. SFF34, were purified 5.6 and 5.9-fold giving Mr values of 36 and 37 kDa. The optimum temperature for the activity was 60 °C (CO1) and 40 °C (CO2), and the optimum pH was 6.25 (CO1) and 6 (CO2) over 30 min reaction time. The apparent Km values for cholesterol were 6.76 mM (CO1) and 4.50 mM (CO2). Both the enzymes...