Adaptive Responses of Mammalian Histidine-degrading Enzymes
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چکیده
منابع مشابه
Adaptive responses of mammalian histidine-degrading enzymes.
Effects of nutritional and hormonal treatments on the activities of rat liver histidine-catabolizing enzymes histidine pyruvate transaminase, histidase, and urocanase, have been examined and estimates have been made of the rates of induction and degradation of each enzyme. Histidase and urocanase activities were slightly elevated in animals fasted for 48 hours, but the transaminase was not affe...
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Urocanate but not histidine was able to induce formation of histidine-degrading enzymes in a histidine ammonia-lyase-deficient mutant of Pseudomonas aeruginosa. The results, in conjunction with others reported previously, indicate that urocanate, the first intermediate, is the physiological inducer of the pathway.
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Inbred weanling rats were maintained on diets containing low (6%), medium (lS%), and high (40%) levels of proteins. After 45 days they were killed and the activities of histidine ammonia lyase, urocanase, and histidine pyruvate aminotransferase in liver were assayed. Histidine ammonia lyase increased with age of the rat, and the increase was proportional to the level of protein in the diet. Ani...
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L-Histidine induces the formation of the four enzymes constituting the histidine-degrading pathway in Bacillus subtilis. Studies of the kinetics of induction of histidase and of FGA hydrolase demonstrated that the two enzymes appear after induction in sequence, separated by a Z-min interval. The results of experiments in which chloramphenicol was used to arrest peptide bond formation indicate t...
متن کاملInduction of Histidine-degrading Enzymes in Protein-starved Rats and Regulation of Histidine Metabolism
Inbred weanling rats were maintained on diets containing low (6%), medium (lS%), and high (40%) levels of proteins. After 45 days they were killed and the activities of histidine ammonia lyase, urocanase, and histidine pyruvate aminotransferase in liver were assayed. Histidine ammonia lyase increased with age of the rat, and the increase was proportional to the level of protein in the diet. Ani...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1970
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)63308-3