Molecular cloning of chicken hepatic histidase and the regulation of histidase mRNA expression by dietary protein

• Published in: The Journal of nutritional biochemistry Vol. 16; no. 2; pp. 114 - 120
• Main Authors: Chendrimada, Thimmaiah P., Davis, Adam J.
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01.02.2005; Elsevier Science
• Subjects: Amino Acid Sequence; Animals; Base Sequence; Biological and medical sciences; Blotting, Northern; Chicken; Chickens - genetics; Cloning, Molecular; Dietary protein; Dietary Proteins - pharmacology; Feeding. Feeding behavior; Fundamental and applied biological sciences. Psychology; Gene Expression Regulation, Enzymologic - drug effects; Histidase; Histidine - administration & dosage; Histidine Ammonia-Lyase - chemistry; Histidine Ammonia-Lyase - genetics; Humans; Liver - enzymology; Mice; Molecular Sequence Data; Rats; RNA, Messenger - analysis; Sequence Homology; Temporal change; Vertebrates: anatomy and physiology, studies on body, several organs or systems; Dietary protein; Histidase; Chicken; Temporal change; Digestive system; Enzyme; Liver; Lyases; Change; Gene expression; Protein; Carbon-nitrogen lyases; Ammonia-lyases; Vertebrata; Regulation(control); Mammalia; Histidine ammonia-lyase; Aves; Molecular cloning
• ISSN: 0955-2863; 1873-4847
• DOI: 10.1016/j.jnutbio.2004.10.008

Chicken hepatic histidase activity varies with dietary protein consumption, but the mechanisms responsible for this alteration in activity are unclear. In the present research, the complete coding sequence and deduced amino acid sequence for chicken histidase was determined from clones isolated from a chicken liver cDNA library. The deduced amino acid sequence of chicken histidase has greater than 85% identity with the amino acid sequences of rat, mouse, and human histidase. In a series of four experiments, broiler chicks were allowed free access for 1.5, 3, 6, or 24 h to a low (13 g/100 g diet), basal (22 g/100 g diet) and high (40 g/100 g diet) protein diet. In the final experiment 5, chicks were allowed free access for 24 h to the basal, high protein diet or the basal diet supplemented with three different levels of l-histidine (0.22 g/100 g diet, 0.43 g/100 g diet or 0.86 g/100 g diet). There were no differences in the expression of the mRNA for histidase at 1.5 h, but at 3 h, histidase mRNA expression was significantly ( P<.05) greater in chicks fed the high protein diet compared to chicks fed the low protein diet. At 6 and 24 h, histidase mRNA expression was significantly enhanced in chicks fed the high protein diet, and significantly reduced in chicks fed the low protein diet, compared with chicks fed the basal diet. Histidase mRNA expression was not altered by supplementing the basal diet with histidine. The results suggest that previously observed alterations in the activity of histidase, which were correlated to dietary protein intake, are mediated by rapid changes in the mRNA expression of this enzyme, and are not necessarily related to dietary histidine intake.