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Candida olea 148 secreted a single acid protease when cultured at acidic pH. In unbuffered medium, the culture pH eventually became alkaline and a single alkaline protease was produced. This was the only proteolytic enzyme produced when the organism was grown in buffered medium at alkaline pH. Both proteolytic enzymes were purified to homogeneity (as assessed by SDS-PAGE). The Mr of the acid protease was 30900, the isoelectric point 4.5; optimum activity against haemoglobin was at 42 degrees C and pH 3.3. This enzyme was inactivated at temperatures above 46 degrees C and was inhibited by either pepstatin and diazoacetyl-norleucine methyl ester but was insensitive to inhibition by either 1,2-epoxy-3-(p-nitrophenoxy)-propane or compounds known to inhibit serine, thiol or metallo proteases. The acid protease contained 11% carbohydrate. The alkaline protease had an Mr of 23400 and isoelectric point of 5.4. The activity of this enzyme using azocoll as substrate above 42 degrees C and was inhibited by phenylmethyl-sulphonyl fluoride and irreversible inactivated by EDTA. The enzyme was also partially inhibited by DTT but was insensitive to either pepstatin or p-chloromercuribenzoic acid.

Extracellular Acid and Alkaline Proteases from Candida olea