Ribosylpyrimidine nucleosidase

In enzymology, a ribosylpyrimidine nucleosidase (EC 3.2.2.8) is an enzyme that catalyzes the chemical reaction

a pyrimidine nucleoside + H₂O ${\displaystyle \rightleftharpoons }$ D-ribose + a pyrimidine base

ribosylpyrimidine nucleosidase
Identifiers
EC no.	3.2.2.8
CAS no.	37288-60-1
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 / QuickGO
Search PMC articles PubMed articles NCBI proteins

Thus, the two substrates of this enzyme are pyrimidine nucleoside and H₂O, whereas its two products are D-ribose and pyrimidine base.

This enzyme belongs to the family of hydrolases, specifically those glycosylases that hydrolyse N-glycosyl compounds. The systematic name of this enzyme class is pyrimidine-nucleoside ribohydrolase. Other names in common use include N-ribosylpyrimidine nucleosidase, pyrimidine nucleosidase, N-ribosylpyrimidine ribohydrolase, pyrimidine nucleoside hydrolase, RihB, YeiK, and nucleoside ribohydrolase. This enzyme participates in purine metabolism and pyrimidine metabolism.

Structural studies

As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes 1Q8F and 1YOE.