IPR023636
Urocanase conserved site
InterPro entry
Short name | Urocanase_CS |
Description
This entry represents a conserved site found in the C-terminal part of Urocanase. It is found also in S-methyl thiourocanate hydratase which cannot use urocanate or thiourocanate as substrate and catalyses the conversion of S-methyl thiourocanate, to S-methyl-thiohydantoin-5-propanoate
[3].
Urocanase
[1] (also known as imidazolonepropionate hydrolase or urocanate hydratase) is the enzyme that catalyses the second step in the degradation of histidine, the hydration of urocanate into imidazolonepropionate:
urocanate + H2O = 4,5-dihydro-4-oxo-5-imidazolepropanoate
Urocanase is found in some bacteria (gene hutU)
[2], in the liver of many vertebrates, and has also been found in the plant Trifolium repens (white clover). Urocanase is a protein of about 60 Kd, it binds tightly to NAD+and uses it as an electrophil cofactor. A conserved cysteine has been found to be important for the catalytic mechanism and could be involved in the binding of the NAD+.
References
1.The urocanase story: a novel role of NAD+ as electrophile. Retey J. Arch. Biochem. Biophys. 314, 1-16, (1994). View articlePMID: 7944380
2.Urocanase and N-formimino-L-glutamate formiminohydrolase of Bacillus subtilis, two enzymes of the histidine degradation pathway. Kaminskas E, Kimhi Y, Magasanik B. J. Biol. Chem. 245, 3536-44, (1970). PMID: 4990470
3.Structure and Substrate Specificity of <i>S</i>-Methyl Thiourocanate Hydratase. Vasseur CM, Karunasegaram D, Seebeck FP. ACS Chem Biol 19, 718-724, (2024). View articlePMID: 38389448
GO terms
biological process
- None
molecular function
cellular component
- None
Cross References
Contributing Member Database Entry
- PROSITE patterns:PS01233