Abstract
1. 1. Detergent-solubilized ostrich duodenal enterokinase was purified by salt fractionation, DEAE-cellulose and Toyopearl HW-65F chromatography. 2. 2. Gradient gel electrophoresis and SDS-PAGE revealed M r values of 127,000 and 62,200, respectively. The ostrich enzyme can be assumed to be a dimer. 3. 3. The amino acid composition of ostrich enterokinase is similar to that of mammalian enterokinase. 4. 4. The highest rate of activation of bovine trypsinogen by ostrich enterokinase was at pH 5.2–5.7.
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