Enzyme:2.4.2.1

Upper Levels: EC2.-.-.- Transferases. : EC2.4.-.- Glycosyltransferases. : EC2.4.2.- Pentosyltransferases.

IDs and Links
IUBMB	EC2
ExPaSy	NiceZyme 2.4.2.1

purine-nucleoside:phosphate ribosyltransferase
Systematic Name	purine-nucleoside:phosphate ribosyltransferase
Common Name	purine-nucleoside phosphorylase inosine phosphorylase PNPase PUNPI PUNPII

Guanosine + Orthophosphate = Guanine + D-Ribose 1-phosphate (links: 2-Amino-9- [ (2R,3R,4S,5R) -3,4-dihydroxy-5- (hydroxymethyl) oxolan-2-yl] H102-3H-purin-6-one = 2-Amino-3,7-dihydropurin-6-one + D-Ribose 1-phosphate)

2-Amino-9- [ (2R,3R,4S,5R) -3,4-dihydroxy-5- (hydroxymethyl) oxolan-2-yl] H102-3H-purin-6-one <Mapping> AtomMap:BMCCPUGU0015$BMCCPUGU0014$0 2-Amino-3,7-dihydropurin-6-one 1 ↔ 1 2 ↔ 2 3 ↔ 3 4 ↔ 4 5 ↔ 5 6 ↔ 6 7 ↔ 7 8 ↔ 8 9 ↔ 9 10 ↔ 10 2-Amino-9- [ (2R,3R,4S,5R) -3,4-dihydroxy-5- (hydroxymethyl) oxolan-2-yl] H102-3H-purin-6-one <Mapping> AtomMap:BMCCPUGU0015$BMSUM5Ae--07$0 D-Ribose 1-phosphate 12 ↔ 1 13 ↔ 2 14 ↔ 3 15 ↔ 4 16 ↔ 5

Xanthosine + Orthophosphate = Xanthine + D-Ribose 1-phosphate (links: 9- [ (2R,3R,4S,5R) -3,4-Dihydroxy-5- (hydroxymethyl) oxolan-2-yl] -3H-purine-2,6-dione = 3,7-Dihydropurine-2,6-dione + D-Ribose 1-phosphate)

9- [ (2R,3R,4S,5R) -3,4-Dihydroxy-5- (hydroxymethyl) oxolan-2-yl] -3H-purine-2,6-dione <Mapping> AtomMap:BMCCPUXA0022$BMCCPUXA0021$0 3,7-Dihydropurine-2,6-dione 1 ↔ 1 2 ↔ 2 3 ↔ 3 4 ↔ 4 5 ↔ 5 6 ↔ 6 7 ↔ 7 8 ↔ 8 9 ↔ 9 9- [ (2R,3R,4S,5R) -3,4-Dihydroxy-5- (hydroxymethyl) oxolan-2-yl] -3H-purine-2,6-dione <Mapping> AtomMap:BMCCPUXA0022$BMSUM5Ae--07$0 D-Ribose 1-phosphate 12 ↔ 1 13 ↔ 2 14 ↔ 3 15 ↔ 4 16 ↔ 5

N-Ribosyl-nicotinamide + Orthophosphate = Nicotinamide + D-Ribose 1-phosphate (links: N-Ribosyl-nicotinamide = Pyridine-3-carboxamide + D-Ribose 1-phosphate)
N-Ribosyl-nicotinamide <Mapping> AtomMap:BMCCPUAPt035$BMMCPD--l020$0 Pyridine-3-carboxamide 1 ↔ 1 2 ↔ 2 3 ↔ 3 4 ↔ 4 5 ↔ 5 6 ↔ 6 7 ↔ 7 8 ↔ 8 N-Ribosyl-nicotinamide <Mapping> AtomMap:BMCCPUAPt035$BMSUM5Ae--07$0 D-Ribose 1-phosphate 10 ↔ 1 11 ↔ 2 12 ↔ 3 13 ↔ 4 14 ↔ 5

Inosine + Orthophosphate = Hypoxanthine + D-Ribose 1-phosphate (links: 9- [ (2R,3R,4S,5R) -3,4-Dihydroxy-5- (hydroxymethyl) oxolan-2-yl] -3H-purin-6-one = 3,7-Dihydropurin-6-one + D-Ribose 1-phosphate)
9- [ (2R,3R,4S,5R) -3,4-Dihydroxy-5- (hydroxymethyl) oxolan-2-yl] -3H-purin-6-one <Mapping> AtomMap:BMCCPUXA0015$BMCCPUXA0012$0 3,7-Dihydropurin-6-one 1 ↔ 1 2 ↔ 2 3 ↔ 3 4 ↔ 4 5 ↔ 5 6 ↔ 6 7 ↔ 7 8 ↔ 8 9 ↔ 9 9- [ (2R,3R,4S,5R) -3,4-Dihydroxy-5- (hydroxymethyl) oxolan-2-yl] -3H-purin-6-one <Mapping> AtomMap:BMCCPUXA0015$BMSUM5Ae--07$0 D-Ribose 1-phosphate 11 ↔ 1 12 ↔ 2 13 ↔ 3 14 ↔ 4 15 ↔ 5

Adenosine + Orthophosphate = Adenine + D-Ribose 1-phosphate (links: 2- (6-Aminopurin-9-yl) -5- (hydroxymethyl) oxolane-3,4-diol = 7H-Purin-6-amine + D-Ribose 1-phosphate)
2- (6-Aminopurin-9-yl) -5- (hydroxymethyl) oxolane-3,4-diol <Mapping> AtomMap:BMCCPUAD0008$BMCCPUAD0007$0 7H-Purin-6-amine 1 ↔ 1 2 ↔ 2 3 ↔ 3 4 ↔ 4 5 ↔ 5 6 ↔ 6 7 ↔ 7 8 ↔ 8 9 ↔ 9 10 ↔ 10 2- (6-Aminopurin-9-yl) -5- (hydroxymethyl) oxolane-3,4-diol <Mapping> AtomMap:BMCCPUAD0008$BMSUM5Ae--07$0 D-Ribose 1-phosphate 11 ↔ 1 12 ↔ 2 13 ↔ 3 14 ↔ 4 15 ↔ 5

Nicotinate D-ribonucleoside + Orthophosphate = Nicotinic acid + D-Ribose 1-phosphate (links: Nicotinate D-ribonucleoside = Pyridine-3-carboxylic acid + D-Ribose 1-phosphate)
Nicotinate D-ribonucleoside <Mapping> AtomMap:BMMCPD--S501$BMMCPD--k021$0 Pyridine-3-carboxylic acid 1 ↔ 1 2 ↔ 2 3 ↔ 3 4 ↔ 4 5 ↔ 5 6 ↔ 6 7 ↔ 7 Nicotinate D-ribonucleoside <Mapping> AtomMap:BMMCPD--S501$BMSUM5Ae--07$0 D-Ribose 1-phosphate 8 ↔ 1 9 ↔ 2 10 ↔ 3 11 ↔ 4 12 ↔ 5