[Properties of the extracellular proteases of Nocardia fructiferi var. ristomycini].

A complex of proteases was isolated from the culture fluid of Nocardia fructiferi var. ristomycini, strain 76. The complex showed caseinolytic activity and was capable of coagulating milk for 30 minutes. It was stable at a temperature of 50 degrees C and pH 8.0. The maximum level of casein hydrolysis was observed at 37 degrees C and pH 8.0. The protease complex preserved its properties for 3 months at 4 degrees C and for 1 month at room temperature.