Summary
High protein dietary content stimulates urea formation in ureotelic animals but does not exert almost any effect on ammonia production from L-amino acids in vitro. L-histidine and L-threonine are the only amino acids which are most actively deaminated by ureotelic animals fed on a high protein diet.
All the steps of L-histidine metabolism have been studied: it has been found that both the histidine transaminase pathway and the histidase pathway are stimulated. Glutamic acid is also a product of histidine catabolism through the histidase pathway, but its catabolism is unaffected by the dietary protein content. These data suggest the existence of independent mechanism controlling the catabolism of the two amino acids.
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Cedrangolo, F., Illiano, G., Servillo, L. et al. Histidine degradation enzymes in rat liver: Induction by high protein intake. Mol Cell Biochem 23, 123–128 (1979). https://doi.org/10.1007/BF00226232
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DOI: https://doi.org/10.1007/BF00226232