The Mechanism of Inhibition of Hydroxylases in Vivo by P-Chlorophenylalanine: The Effect of Cycloheximide

Document Type

Article

Publication Date

1-13-1971

Description

p-Chloro-[14C]phenylalanine administered in vivo to rats was recovered from acid hydrolysates of purified enzyme protein by amino acid analysis. Inhibition in vivo of rat liver phenylalanine 4-hydroxylase (EC 1.14.3.1) was significantly reduced by administration of cycloheximide. The active incorporation of p-chloro-[2-14C]-phenylalanine into brain and liver aminoacyl-RNA and protein was also inhibited by cycloheximide. Disc gel electrophoresis patterns of purified phenylalanine 4-hydroxylase are altered following p-chlorophenylalanine administration.

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