- Diaminohydroxyphosphoribosylaminopyrimidine deaminase
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diaminohydroxyphosphoribosylaminopyrimidine deaminase Identifiers EC number 3.5.4.26 CAS number 68994-19-4 Databases IntEnz IntEnz view BRENDA BRENDA entry ExPASy NiceZyme view KEGG KEGG entry MetaCyc metabolic pathway PRIAM profile PDB structures RCSB PDB PDBe PDBsum Gene Ontology AmiGO / EGO Search PMC articles PubMed articles In enzymology, a diaminohydroxyphosphoribosylaminopyrimidine deaminase (EC 3.5.4.26) is an enzyme that catalyzes the chemical reaction
- 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)pyrimidine + H2O 5-amino-6-(5-phosphoribosylamino)uracil + NH3
Thus, the two substrates of this enzyme are 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)pyrimidine and H2O, whereas its two products are 5-amino-6-(5-phosphoribosylamino)uracil and NH3.
This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds (specifically in cyclic amidines). The systematic name of this enzyme class is 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)pyrimidine 2-aminohydrolase. This enzyme participates in riboflavin metabolism.
Structural studies
As of late 2007, 6 structures have been solved for this class of enzymes, with PDB accession codes 2B3Z, 2D5N, 2G6V, 2HXV, 2O7P, and 2OBC.
References
- Burrows RB, Brown GM (1978). "Presence of Escherichia coli of a deaminase and a reductase involved in biosynthesis of riboflavin". J. Bacteriol. 136 (2): 657–67. PMC 218591. PMID 30756. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=218591.
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