Histidine ammonia-lyase
Histidine ammonia-lyase (or histidase, or histidinase) is an enzyme that in humans is encoded by the HAL gene.[1][2] Histidase converts histidine into ammonia and urocanic acid.
Function
Histidine ammonia-lyase is a cytosolic enzyme catalyzing the first reaction in histidine catabolism, the nonoxidative deamination of L-histidine to trans-urocanic acid.[1] The reaction is catalyzed by 3,5-dihydro-5-methyldiene-4H-imidazol-4-one, an electrophilic co-factor which is formed autocatalytically by cyclization of the protein backbone of the enzyme.[3]
Pathology
Mutations in the gene for histidase are associated with histidinemia and urocanic aciduria.
References
- ↑ 1.0 1.1 “Entrez Gene: histidine ammonia-lyase”.
- ↑ Suchi M, Sano H, Mizuno H, Wada Y (September 1995). “Molecular cloning and structural characterization of the human histidase gene (HAL)”. Genomics. 29 (1): 98–104. doi:10.1006/geno.1995.1219. PMID 8530107.
- ↑ Schwede, TF; Rétey, J; Schulz, GE (Apr 27, 1999). “Crystal structure of histidine ammonia-lyase revealing a novel polypeptide modification as the catalytic electrophile”. Biochemistry. 38 (17): 5355–5361. doi:10.1021/bi982929q. PMID 10220322.
Further reading
- Suchi M, Harada N, Wada Y, Takagi Y (1993). “Molecular cloning of a cDNA encoding human histidase”. Biochim. Biophys. Acta. 1216 (2): 293–5. doi:10.1016/0167-4781(93)90157-9. PMID 7916645.
- Davila S, Froeling FE, Tan A, et al. (2010). “New genetic associations detected in a host response study to hepatitis B vaccine”. Genes Immun. 11 (3): 232–8. doi:10.1038/gene.2010.1. PMID 20237496.
- Gerhard DS, Wagner L, Feingold EA, et al. (2004). “The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)”. Genome Res. 14 (10B): 2121–7. doi:10.1101/gr.2596504. PMC 528928. PMID 15489334.
- Eckhart L, Schmidt M, Mildner M, et al. (2008). “Histidase expression in human epidermal keratinocytes: regulation by differentiation status and all-trans retinoic acid”. J. Dermatol. Sci. 50 (3): 209–15. doi:10.1016/j.jdermsci.2007.12.009. PMID 18280705.
- Welsh MM, Karagas MR, Applebaum KM, et al. (2008). “A role for ultraviolet radiation immunosuppression in non-melanoma skin cancer as evidenced by gene-environment interactions”. Carcinogenesis. 29 (10): 1950–4. doi:10.1093/carcin/bgn160. PMC 2556967. PMID 18641401.
- Strausberg RL, Feingold EA, Grouse LH, et al. (2002). “Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences”. Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. Bibcode:2002PNAS…9916899M. doi:10.1073/pnas.242603899. JSTOR 3074035. PMC 139241. PMID 12477932.
- Kawai Y, Moriyama A, Asai K, et al. (2005). “Molecular characterization of histidinemia: identification of four missense mutations in the histidase gene”. Hum. Genet. 116 (5): 340–6. doi:10.1007/s00439-004-1232-5. PMID 15806399.
- Taylor RG, García-Heras J, Sadler SJ, et al. (1991). “Localization of histidase to human chromosome region 12q22→q24.1 and mouse chromosome region 10C2→D1”. Cytogenet. Cell Genet. 56 (3–4): 178–81. doi:10.1159/000133082. PMID 2055114.
- Alemán G, Ortíz V, Langley E, et al. (2005). “Regulation by glucagon of the rat histidase gene promoter in cultured rat hepatocytes and human hepatoblastoma cells”. Am. J. Physiol. Endocrinol. Metab. 289 (1): E172–9. doi:10.1152/ajpendo.00584.2004. PMID 15741241.
External links
- Histidine+Ammonia-Lyase at the US National Library of Medicine Medical Subject Headings (MeSH)
This article incorporates text from the United States National Library of Medicine, which is in the public domain.
© 2026 MyEClinic – IFTM Institut für Telematik in der Medizin GmbH