Abstract
1. The development, localization and heterogeneity of acid phosphatase and a Zn(2+)-activated acid phosphatase in cellular fractions of developing chick liver were studied. 2. Acid phosphatase is distributed abundantly in the particulate and soluble fractions. The soluble fraction is rich in Zn(2+)-activated acid phosphatase, which attains its peak activity at about 15 days of incubation. 3. The particulate acid phosphatase activity is inhibited by fluoride but not by sodium l(+)-tartrate or cysteine. On the other hand, the soluble Zn(2+)-activated acid phosphatase activity is inhibited by sodium l(+)-tartrate and cysteine but not by fluoride. 4. The pH optimum of these two enzymes is similar at about 5.6. 5. The soluble Zn(2+)-activated acid phosphatase activity appears to be thermally stabilized by the treatment with Triton X-100 or bovine serum albumin.
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