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JBC, Vol. 254, Issue 8, 2665-2668, Apr, 1979

The mechanism of the irreversible inhibition ofrat liver phenylalanine hydroxylase due to treatment with p-chlorophenylalanine. The lack of effect on turnover of phenylalanine hydroxylase

N. Chang, S. Kaufman and S. Milstien

The administration of a single dose of p-chlorophenylalanine (360 mg/kg) to rats leads to the irreversible loss of 90% of hepatic phenylalanine hydroxylase activity after 24 h. This loss of activity is not the result of either an alteration in the overall structure of the enzyme, as determined by its antigenicity, or in the total immunologically reactive protein in the liver, as tested with a specific antiserum prepared against native phenylalanine hydroxylase. Neither the rate of synthesis nor the rate of degradation of phenylalanine hydroxylase is changed by p-chlorophenylalanine (pClPhe) treatment. The half-life for the enzyme is about 2 days in control and in pClPhe-treated rats. In addition, there is no detectable incorporation of pClPhe into the phenylalanine hydroxylase molecule itself.
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