Reactome: A Curated Pathway Database

guanine + (deoxy)ribose 1-phosphate <=> (deoxy)guanosine + orthophosphate [NP]

Stable Identifier
R-HSA-112034
Type
Reaction
Species
Homo sapiens
Compartment
Locations in the PathwayBrowser
Summation

Cytosolic nucleoside phosphorylase (NP) trimer catalyzes the reversible reaction of guanine with ribose 1-phosphate or deoxyribose 1-phosphate to form guanosine or deoxyguanosine and orthophosphate (Ealick et al. 1990; Wiginton et al. 1980). While NP is active with either ribose 1-phosphate or deoxyribose 1-phosphate in vitro, levels of deoxyribose 1-phosphate are normally low in vivo, limiting the extent of this reaction. NP deficiency in vivo is associated with defects in purine nucleotide salvage and leads to immunodeficiency (Williams et al. 1987).

Literature References
Participants
Participant Of
hasEvent
This entity is regulated by:
Title Physical Entity Activity
purine-nucleoside phosphorylase activity of NP trimer [cytosol] NP trimer [cytosol] purine-nucleoside phosphorylase activity (0004731)
Orthologous Events