The Enzyme Database

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EC 2.4.2.7     
Accepted name: adenine phosphoribosyltransferase
Reaction: AMP + diphosphate = adenine + 5-phospho-α-D-ribose 1-diphosphate
For diagram of ribose activation, click here
Other name(s): AMP pyrophosphorylase; transphosphoribosidase; APRT; AMP-pyrophosphate phosphoribosyltransferase; adenine phosphoribosylpyrophosphate transferase; adenosine phosphoribosyltransferase; adenylate pyrophosphorylase; adenylic pyrophosphorylase
Systematic name: AMP:diphosphate phospho-D-ribosyltransferase
Comments: 5-Amino-4-imidazolecarboxamide can replace adenine.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, MetaCyc, PDB, CAS registry number: 9027-80-9
References:
1.  Flaks, J.G., Erwin, M.J. and Buchanan, J.M. Biosynthesis of the purines. XVI. The synthesis of adenosine 5′-phosphate and 5-amino-4-imidazolecarboxamide ribotide by a nucleotide pyrophosphorylase. J. Biol. Chem. 228 (1957) 201–213. [PMID: 13475309]
2.  Kornberg, A., Lieberman, I. and Simms, E.S. Enzymatic synthesis of purine nucleotides. J. Biol. Chem. 215 (1955) 417–427. [PMID: 14392175]
3.  Lukens, L.N. and Herrington, K.A. Enzymic formation of 6-mercaptopurine ribotide. Biochim. Biophys. Acta 24 (1957) 432–433. [PMID: 13436452]
[EC 2.4.2.7 created 1961]
 
 
EC 2.4.2.8     
Accepted name: hypoxanthine phosphoribosyltransferase
Reaction: IMP + diphosphate = hypoxanthine + 5-phospho-α-D-ribose 1-diphosphate
Other name(s): IMP pyrophosphorylase; transphosphoribosidase; hypoxanthine—guanine phosphoribosyltransferase; guanine phosphoribosyltransferase; GPRT; HPRT; guanosine 5′-phosphate pyrophosphorylase; IMP-GMP pyrophosphorylase; HGPRTase; 6-hydroxypurine phosphoribosyltransferase; 6-mercaptopurine phosphoribosyltransferase; GMP pyrophosphorylase; guanine-hypoxanthine phosphoribosyltransferase; guanosine phosphoribosyltransferase; guanylate pyrophosphorylase; guanylic pyrophosphorylase; inosinate pyrophosphorylase; inosine 5′-phosphate pyrophosphorylase; inosinic acid pyrophosphorylase; inosinic pyrophosphorylase; 6-mercaptopurine phosphoribosyltransferase; purine-6-thiol phosphoribosyltransferase
Systematic name: IMP:diphosphate phospho-D-ribosyltransferase
Comments: Guanine and 6-mercaptopurine can replace hypoxanthine.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, MetaCyc, PDB, CAS registry number: 9016-12-0
References:
1.  Flaks, J.G. Nucleotide synthesis from 5-phosphoribosylpyrophosphate. Methods Enzymol. 6 (1963) 136–158.
2.  Kornberg, A., Lieberman, I. and Simms, E.S. Enzymatic synthesis of purine nucleotides. J. Biol. Chem. 215 (1955) 417–427. [PMID: 14392175]
3.  Lukens, L.N. and Herrington, K.A. Enzymic formation of 6-mercaptopurine ribotide. Biochim. Biophys. Acta 24 (1957) 432–433. [PMID: 13436452]
4.  Remy, C.N., Remy, W.T. and Buchanan, J.M. Biosynthesis of the purines. VIII. Enzymatic synthesis and utilization of α-5-phosphoribosylpyrophosphate. J. Biol. Chem. 217 (1955) 885–895. [PMID: 13271449]
[EC 2.4.2.8 created 1961, modified 1982]
 
 
EC 2.4.2.9     
Accepted name: uracil phosphoribosyltransferase
Reaction: UMP + diphosphate = uracil + 5-phospho-α-D-ribose 1-diphosphate
Other name(s): UMP pyrophosphorylase; UPRTase; UMP:pyrophosphate phosphoribosyltransferase; uridine 5′-phosphate pyrophosphorylase; uridine monophosphate pyrophosphorylase; uridylate pyrophosphorylase; uridylic pyrophosphorylase
Systematic name: UMP:diphosphate phospho-α-D-ribosyltransferase
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9030-24-4
References:
1.  Crawford, I., Kornberg, A. and Simms, E.S. Conversion of uracil and orotate to uridine 5′-phosphate by enzymes in lactobacilli. J. Biol. Chem. 226 (1967) 1093–1101. [PMID: 13438895]
2.  Flaks, J.G. Nucleotide synthesis from 5-phosphoribosylpyrophosphate. Methods Enzymol. 6 (1963) 136–158.
[EC 2.4.2.9 created 1961]
 
 
EC 2.4.2.10     
Accepted name: orotate phosphoribosyltransferase
Reaction: orotidine 5′-phosphate + diphosphate = orotate + 5-phospho-α-D-ribose 1-diphosphate
For diagram of pyrimidine biosynthesis, click here
Other name(s): orotidylic acid phosphorylase; orotidine-5′-phosphate pyrophosphorylase; OPRTase; orotate phosphoribosyl pyrophosphate transferase; orotic acid phosphoribosyltransferase; orotidine 5′-monophosphate pyrophosphorylase; orotidine monophosphate pyrophosphorylase; orotidine phosphoribosyltransferase; orotidylate phosphoribosyltransferase; orotidylate pyrophosphorylase; orotidylic acid pyrophosphorylase; orotidylic phosphorylase; orotidylic pyrophosphorylase
Systematic name: orotidine-5′-phosphate:diphosphate phospho-α-D-ribosyl-transferase
Comments: The enzyme from higher eukaryotes also catalyses the reaction listed as EC 4.1.1.23, orotidine-5′-phosphate decarboxylase.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, MetaCyc, PDB, CAS registry number: 9030-25-5
References:
1.  Jones, M.E., Kavipurapu, P.R. and Traut, T.W. Orotate phosphoribosyltransferase: orotidylate decarboxylase (Ehrlich ascites cell). Methods Enzymol. 51 (1978) 155–167. [DOI] [PMID: 692383]
2.  Lieberman, I., Kornberg, A. and Simms, E.S. Enzymatic synthesis of pyrimidine nucleotides. Orotidine-5′-phosphate and uridine-5′-phosphate. J. Biol. Chem. 215 (1955) 403–415. [PMID: 14392174]
3.  McClard, R.W., Black, M.J., Livingstone, L.R. and Jones, M.E. Isolation and initial characterization of the single polypeptide that synthesizes uridine 5′-monophosphate from orotate in Ehrlich ascites carcinoma. Purification by tandem affinity chromatography of uridine-5′-monophosphate synthase. Biochemistry 19 (1980) 4699–4706. [PMID: 6893554]
[EC 2.4.2.10 created 1961, modified 1986]
 
 
EC 2.4.2.11      
Transferred entry: nicotinate phosphoribosyltransferase. Now EC 6.3.4.21, nicotinate phosphoribosyltransferase.
[EC 2.4.2.11 created 1961, deleted 2013]
 
 
EC 2.4.2.12     
Accepted name: nicotinamide phosphoribosyltransferase
Reaction: nicotinamide D-ribonucleotide + diphosphate = nicotinamide + 5-phospho-α-D-ribose 1-diphosphate
For diagram of NADP+ biosynthesis, click here
Other name(s): NMN pyrophosphorylase; nicotinamide mononucleotide pyrophosphorylase; nicotinamide mononucleotide synthetase; NMN synthetase; nicotinamide-nucleotide:diphosphate phospho-α-D-ribosyltransferase
Systematic name: nicotinamide-D-ribonucleotide:diphosphate phospho-α-D-ribosyltransferase
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9030-27-7
References:
1.  Preiss, J. and Handler, P. Enzymatic synthesis of nicotinamide mononucleotide. J. Biol. Chem. 225 (1957) 759–770. [PMID: 13416279]
[EC 2.4.2.12 created 1961]
 
 
EC 2.4.2.14     
Accepted name: amidophosphoribosyltransferase
Reaction: 5-phospho-β-D-ribosylamine + diphosphate + L-glutamate = L-glutamine + 5-phospho-α-D-ribose 1-diphosphate + H2O
For diagram of ribose activation, click here
Other name(s): phosphoribosyldiphosphate 5-amidotransferase; glutamine phosphoribosyldiphosphate amidotransferase; α-5-phosphoribosyl-1-pyrophosphate amidotransferase; 5′-phosphoribosylpyrophosphate amidotransferase; 5-phosphoribosyl-1-pyrophosphate amidotransferase; 5-phosphororibosyl-1-pyrophosphate amidotransferase; glutamine 5-phosphoribosylpyrophosphate amidotransferase; glutamine ribosylpyrophosphate 5-phosphate amidotransferase; phosphoribose pyrophosphate amidotransferase; phosphoribosyl pyrophosphate amidotransferase; phosphoribosylpyrophosphate glutamyl amidotransferase; 5-phosphoribosylamine:diphosphate phospho-α-D-ribosyltransferase (glutamate-amidating)
Systematic name: 5-phospho-β-D-ribosylamine:diphosphate phospho-α-D-ribosyltransferase (glutamate-amidating)
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9031-82-7
References:
1.  Caskey, C.T., Ashton, D.M. and Wyngaarden, J.B. The enzymology of feedback inhibition of glutamine phosphoribosylpyrophosphate amidotransferase by purine ribonucleotides. J. Biol. Chem. 239 (1964) 2570–2579. [PMID: 14235537]
2.  Hartman, S.C. and Buchanan, J.M. Biosynthesis of the purines. XXI. 5-Phosphoribosylpyrophosphate amidotransferase. J. Biol. Chem. 233 (1958) 451–455. [PMID: 13563519]
[EC 2.4.2.14 created 1961]
 
 
EC 2.4.2.17     
Accepted name: ATP phosphoribosyltransferase
Reaction: 1-(5-phospho-β-D-ribosyl)-ATP + diphosphate = ATP + 5-phospho-α-D-ribose 1-diphosphate
For diagram of histidine biosynthesis (early stages), click here
Other name(s): phosphoribosyl-ATP pyrophosphorylase; adenosine triphosphate phosphoribosyltransferase; phosphoribosyladenosine triphosphate:pyrophosphate phosphoribosyltransferase; phosphoribosyl ATP synthetase; phosphoribosyl ATP:pyrophosphate phosphoribosyltransferase; phosphoribosyl-ATP:pyrophosphate-phosphoribosyl phosphotransferase; phosphoribosyladenosine triphosphate pyrophosphorylase; phosphoribosyladenosine triphosphate synthetase; 1-(5-phospho-D-ribosyl)-ATP:diphosphate phospho-α-D-ribosyl-transferase
Systematic name: 1-(5-phospho-β-D-ribosyl)-ATP:diphosphate phospho-α-D-ribosyl-transferase
Comments: Involved in histidine biosynthesis.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9031-46-3
References:
1.  Ames, B.N., Martin, R.G. and Garry, B.J. The first step of histidine biosynthesis. J. Biol. Chem. 236 (1961) 2019–2026. [PMID: 13682989]
2.  Martin, R.G. The phosphorolysis of nucleosides by rabbit bone marrow: The nature of feedback inhibition by histidine. J. Biol. Chem. 238 (1963) 257–268.
3.  Voll, M.J., Appella, E. and Martin, R.G. Purification and composition studies of phosphoribosyladenosine triphosphate:pyrophosphate phosphoribosyltransferase, the first enzyme of histidine biosynthesis. J. Biol. Chem. 242 (1967) 1760–1767. [PMID: 5337591]
[EC 2.4.2.17 created 1972]
 
 
EC 2.4.2.18     
Accepted name: anthranilate phosphoribosyltransferase
Reaction: N-(5-phospho-D-ribosyl)-anthranilate + diphosphate = anthranilate + 5-phospho-α-D-ribose 1-diphosphate
For diagram of tryptophan biosynthesis, click here
Other name(s): phosphoribosyl-anthranilate pyrophosphorylase; PRT; anthranilate 5-phosphoribosylpyrophosphate phosphoribosyltransferase; anthranilate phosphoribosylpyrophosphate phosphoribosyltransferase; phosphoribosylanthranilate pyrophosphorylase; phosphoribosylanthranilate transferase; anthranilate-PP-ribose-P phosphoribosyltransferase
Systematic name: N-(5-phospho-D-ribosyl)-anthranilate:diphosphate phospho-α-D-ribosyltransferase
Comments: In some organisms, this enzyme is part of a multifunctional protein together with one or more other components of the system for biosynthesis of tryptophan [EC 4.1.1.48 (indole-3-glycerol-phosphate synthase), EC 4.1.3.27 (anthranilate synthase), EC 4.2.1.20 (tryptophan synthase) and EC 5.3.1.24 (phosphoribosylanthranilate isomerase)].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9059-35-2
References:
1.  Creighton, T.E. and Yanofsky, C. Chorismate to tryptophan (Escherichia coli) - anthranilate synthetase, PR transferase, PRA isomerase, InGP synthetase, tryptophan synthetase. Methods Enzymol. 17A (1970) 365–380.
2.  Hütter, R., Niederberger, P. and DeMoss, J.A. Tryptophan synthetic genes in eukaryotic microorganisms. Annu. Rev. Microbiol. 40 (1986) 55–77. [DOI] [PMID: 3535653]
3.  Ito, J. and Yanofsky, C. Anthranilate synthetase, an enzyme specified by the tryptophan operon of Escherichia coli: Comparative studies on the complex and the subunits. J. Bacteriol. 97 (1969) 734–742. [PMID: 4886290]
4.  Wegman, J. and DeMoss, J.A. The enzymatic conversion of anthranilate to indolylglycerol phosphate in Neurospora crassa. J. Biol. Chem. 240 (1965) 3781–3788. [PMID: 5842052]
[EC 2.4.2.18 created 1972]
 
 
EC 2.4.2.19     
Accepted name: nicotinate-nucleotide diphosphorylase (carboxylating)
Reaction: β-nicotinate D-ribonucleotide + diphosphate + CO2 = pyridine-2,3-dicarboxylate + 5-phospho-α-D-ribose 1-diphosphate
For diagram of NAD+ biosynthesis, click here
Glossary: quinolinate = pyridine-2,3-dicarboxylate
Other name(s): quinolinate phosphoribosyltransferase (decarboxylating); quinolinic acid phosphoribosyltransferase; QAPRTase; NAD+ pyrophosphorylase; nicotinate mononucleotide pyrophosphorylase (carboxylating); quinolinic phosphoribosyltransferase
Systematic name: β-nicotinate-D-ribonucleotide:diphosphate phospho-α-D-ribosyltransferase (carboxylating)
Comments: The reaction is catalysed in the opposite direction. Since quinolinate is synthesized from L-tryptophan in eukaryotes, but from L-aspartate in some prokaryotes, this is the first NAD+ biosynthesis enzyme shared by both eukaryotes and prokaryotes [3].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 37277-74-0
References:
1.  Gholson, R.K., Ueda, I., Ogasawara, N. and Henderson, L.M. The enzymatic conversion of quinolinate to nicotinic acid mononucleotide in mammalian liver. J. Biol. Chem. 239 (1964) 1208–1214. [PMID: 14165928]
2.  Packman, P.M. and Jakoby, W.B. Crystalline quinolinate phosphoribosyltransferase. J. Biol. Chem. 240 (1965) 4107–4108. [PMID: 5320648]
3.  Katoh, A., Uenohara, K., Akita, M. and Hashimoto, T. Early steps in the biosynthesis of NAD in Arabidopsis start with aspartate and occur in the plastid. Plant Physiol. 141 (2006) 851–857. [DOI] [PMID: 16698895]
[EC 2.4.2.19 created 1972]
 
 
EC 2.4.2.20     
Accepted name: dioxotetrahydropyrimidine phosphoribosyltransferase
Reaction: a 2,4-dioxotetrahydropyrimidine D-ribonucleotide + diphosphate = a 2,4-dioxotetrahydropyrimidine + 5-phospho-α-D-ribose 1-diphosphate
Other name(s): dioxotetrahydropyrimidine-ribonucleotide pyrophosphorylase; dioxotetrahydropyrimidine phosphoribosyl transferase; dioxotetrahydropyrimidine ribonucleotide pyrophosphorylase; 2,4-dioxotetrahydropyrimidine-nucleotide:diphosphate phospho-α-D-ribosyltransferase
Systematic name: 2,4-dioxotetrahydropyrimidine-D-ribonucleotide:diphosphate phospho-α-D-ribosyltransferase
Comments: Acts (in the reverse direction) on uracil and other pyrimidines and pteridines containing a 2,4-diketo structure.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 37277-75-1
References:
1.  Hatfield, D. and Wyngaarden, J.B. 3-Ribosylpurines. I. Synthesis of (3-ribosyluric acid) 5′-phosphate and (3-ribosylxanthine) 5′-phosphate by a pyrimidine ribonucleotide pyrophosphorylase of beef erythrocytes. J. Biol. Chem. 239 (1964) 2580–2586. [PMID: 14235538]
[EC 2.4.2.20 created 1972]
 
 
EC 2.4.2.22     
Accepted name: xanthine phosphoribosyltransferase
Reaction: XMP + diphosphate = 5-phospho-α-D-ribose 1-diphosphate + xanthine
Glossary: XMP = 9-(5-phospho-β-D-ribosyl)xanthine = xanthosine 5′-phosphate
Other name(s): Xan phosphoribosyltransferase; xanthosine 5′-phosphate pyrophosphorylase; xanthylate pyrophosphorylase; xanthylic pyrophosphorylase; XMP pyrophosphorylase; 5-phospho-α-D-ribose-1-diphosphate:xanthine phospho-D-ribosyltransferase; 9-(5-phospho-β-D-ribosyl)xanthine:diphosphate 5-phospho-α-D-ribosyltransferase
Systematic name: XMP:diphosphate 5-phospho-α-D-ribosyltransferase
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9023-10-3
References:
1.  Krenitsky, T.A., Neil, S.M. and Miller, R.L. Guanine and xanthine phosphoribosyltransfer activities of Lactobacillus casei and Escherichia coli. Their relationship to hypoxanthine and adenine phosphoribosyltransfer activities. J. Biol. Chem. 245 (1970) 2605–2611. [PMID: 4910918]
[EC 2.4.2.22 created 1972]
 
 
EC 2.4.2.45     
Accepted name: decaprenyl-phosphate phosphoribosyltransferase
Reaction: trans,octacis-decaprenyl phosphate + 5-phospho-α-D-ribose 1-diphosphate = trans,octacis-decaprenylphospho-β-D-ribofuranose 5-phosphate + diphosphate
For diagram of decaprenylphosphoarabinofuranose biosynthesis, click here
Other name(s): 5-phospho-α-D-ribose-1-diphosphate:decaprenyl-phosphate 5-phosphoribosyltransferase; 5-phospho-α-D-ribose 1-pyrophosphate:decaprenyl phosphate 5-phosphoribosyltransferase; DPPR synthase; Rv3806
Systematic name: trans,octacis-decaprenylphospho-β-D-ribofuranose 5-phosphate:diphosphate phospho-α-D-ribosyltransferase
Comments: Requires Mg2+. Isolated from Mycobacterium tuberculosis. Has some activity with other polyprenyl phosphates.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Huang, H., Scherman, M.S., D'Haeze, W., Vereecke, D., Holsters, M., Crick, D.C. and McNeil, M.R. Identification and active expression of the Mycobacterium tuberculosis gene encoding 5-phospho-α-D-ribose-1-diphosphate: decaprenyl-phosphate 5-phosphoribosyltransferase, the first enzyme committed to decaprenylphosphoryl-D-arabinose synthesis. J. Biol. Chem. 280 (2005) 24539–24543. [DOI] [PMID: 15878857]
[EC 2.4.2.45 created 2012]
 
 
EC 2.4.2.49     
Accepted name: neamine phosphoribosyltransferase
Reaction: neamine + 5-phospho-α-D-ribose 1-diphosphate = 5′′-phosphoribostamycin + diphosphate
For diagram of neamine and ribostamycin biosynthesis, click here
Glossary: neamine = (2R,3S,4R,5R,6R)-5-amino-2-(aminomethyl)-6-{[(1R,2R,3S,4R,6S)-4,6-diamino-2,3-dihydroxycyclohexyl]oxy}oxane-3,4-diol
ribostamycin = (2R,3S,4R,5R,6R)-5-amino-2-(aminomethyl)-6-{[(1R,2R,3S,4R,6S)-4,6-diamino-2-{[(2S,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]oxy}-3-hydroxycyclohexyl]oxy}oxane-3,4-diol
Other name(s): btrL (gene name); neoM (gene name)
Systematic name: neamine:5-phospho-α-D-ribose 1-diphosphate phosphoribosyltransferase
Comments: Involved in the biosynthetic pathways of several clinically important aminocyclitol antibiotics, including ribostamycin, neomycin and butirosin. The enzyme requires a divalent metal ion, optimally Mg2+, Ni2+ or Co2+.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Kudo, F., Fujii, T., Kinoshita, S. and Eguchi, T. Unique O-ribosylation in the biosynthesis of butirosin. Bioorg. Med. Chem. 15 (2007) 4360–4368. [DOI] [PMID: 17482823]
[EC 2.4.2.49 created 2013]
 
 
EC 2.4.2.54     
Accepted name: β-ribofuranosylphenol 5′-phosphate synthase
Reaction: 5-phospho-α-D-ribose 1-diphosphate + 4-hydroxybenzoate = 4-(β-D-ribofuranosyl)phenol 5′-phosphate + CO2 + diphosphate
For diagram of methanopterin biosynthesis (part 2), click here
Other name(s): β-RFAP synthase (incorrect); β-RFA-P synthase (incorrect); AF2089 (gene name); MJ1427 (gene name); β-ribofuranosylhydroxybenzene 5′-phosphate synthase; 4-(β-D-ribofuranosyl)aminobenzene 5′-phosphate synthase (incorrect); β-ribofuranosylaminobenzene 5′-phosphate synthase (incorrect); 5-phospho-α-D-ribose 1-diphosphate:4-aminobenzoate 5-phospho-β-D-ribofuranosyltransferase (decarboxylating) (incorrect)
Systematic name: 5-phospho-α-D-ribose-1-diphosphate:4-hydroxybenzoate 5-phospho-β-D-ribofuranosyltransferase (decarboxylating)
Comments: The enzyme is involved in biosynthesis of tetrahydromethanopterin in archaea. It was initially thought to use 4-aminobenzoate as a substrate, but was later shown to utilize 4-hydroxybenzoate [4]. The activity is dependent on Mg2+ or Mn2+ [1].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Rasche, M.E. and White, R.H. Mechanism for the enzymatic formation of 4-(β-D-ribofuranosyl)aminobenzene 5′-phosphate during the biosynthesis of methanopterin. Biochemistry 37 (1998) 11343–11351. [DOI] [PMID: 9698382]
2.  Scott, J.W. and Rasche, M.E. Purification, overproduction, and partial characterization of β-RFAP synthase, a key enzyme in the methanopterin biosynthesis pathway. J. Bacteriol. 184 (2002) 4442–4448. [DOI] [PMID: 12142414]
3.  Dumitru, R.V. and Ragsdale, S.W. Mechanism of 4-(β-D-ribofuranosyl)aminobenzene 5′-phosphate synthase, a key enzyme in the methanopterin biosynthetic pathway. J. Biol. Chem. 279 (2004) 39389–39395. [DOI] [PMID: 15262968]
4.  White, R.H. The conversion of a phenol to an aniline occurs in the biochemical formation of the 1-(4-aminophenyl)-1-deoxy-D-ribitol moiety in methanopterin. Biochemistry 50 (2011) 6041–6052. [DOI] [PMID: 21634403]
[EC 2.4.2.54 created 2013, modified 2014, modified 2015]
 
 
EC 2.7.4.23     
Accepted name: ribose 1,5-bisphosphate phosphokinase
Reaction: ATP + α-D-ribose 1,5-bisphosphate = ADP + 5-phospho-α-D-ribose 1-diphosphate
For diagram of AMP catabolism, click here
Glossary: 5-phospho-α-D-ribose 1-diphosphate = PRPP
Other name(s): ribose 1,5-bisphosphokinase; PhnN; ATP:ribose-1,5-bisphosphate phosphotransferase
Systematic name: ATP:α-D-ribose-1,5-bisphosphate phosphotransferase
Comments: This enzyme, found in NAD supression mutants of Escherichia coli, synthesizes 5-phospho-α-D-ribose 1-diphosphate (PRPP) without the participation of EC 2.7.6.1, ribose-phosphate diphosphokinase. Ribose, ribose 1-phosphate and ribose 5-phosphate are not substrates, and GTP cannot act as a phosphate donor.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Hove-Jensen, B., Rosenkrantz, T.J., Haldimann, A. and Wanner, B.L. Escherichia coli phnN, encoding ribose 1,5-bisphosphokinase activity (phosphoribosyl diphosphate forming): dual role in phosphonate degradation and NAD biosynthesis pathways. J. Bacteriol. 185 (2003) 2793–2801. [DOI] [PMID: 12700258]
[EC 2.7.4.23 created 2006]
 
 
EC 2.7.6.1     
Accepted name: ribose-phosphate diphosphokinase
Reaction: ATP + D-ribose 5-phosphate = AMP + 5-phospho-α-D-ribose 1-diphosphate
For diagram of ribose activation, click here
Glossary: PRPP = 5-phospho-α-D-ribose 1-diphosphate
Other name(s): ribose-phosphate pyrophosphokinase; PRPP synthetase; phosphoribosylpyrophosphate synthetase; PPRibP synthetase; PP-ribose P synthetase; 5-phosphoribosyl-1-pyrophosphate synthetase; 5-phosphoribose pyrophosphorylase; 5-phosphoribosyl-α-1-pyrophosphate synthetase; phosphoribosyl-diphosphate synthetase; phosphoribosylpyrophosphate synthase; pyrophosphoribosylphosphate synthetase; ribophosphate pyrophosphokinase; ribose-5-phosphate pyrophosphokinase
Systematic name: ATP:D-ribose-5-phosphate diphosphotransferase
Comments: dATP can also act as donor.
Links to other databases: BRENDA, EXPASY, GTD, KEGG, MetaCyc, PDB, CAS registry number: 9015-83-2
References:
1.  Hughes, D.E. and Williamson, D.H. Some properties of glutaminase of Clostridium welchii. Biochem. J. 51 (1952) 45–55. [PMID: 14944530]
2.  Hurlbert, R.B. and Reichard, P. The conversion of orotic acid to uridine nucleotides in vitro. Acta Chem. Scand. 9 (1955) 251–262.
3.  Remy, C.N., Remy, W.T. and Buchanan, J.M. Biosynthesis of the purines. VIII. Enzymatic synthesis and utilization of α-5-phosphoribosylpyrophosphate. J. Biol. Chem. 217 (1955) 885–895. [PMID: 13271449]
4.  Switzer, R.L. Regulation and mechanism of phosphoribosylpyrophosphate synthetase. I. Purification and properties of the enzyme from Salmonella typhimurium. J. Biol. Chem. 244 (1969) 2854–2863. [PMID: 4306285]
[EC 2.7.6.1 created 1961]
 
 
EC 6.3.4.21     
Accepted name: nicotinate phosphoribosyltransferase
Reaction: nicotinate + 5-phospho-α-D-ribose 1-diphosphate + ATP + H2O = β-nicotinate D-ribonucleotide + diphosphate + ADP + phosphate
For diagram of NAD+ biosynthesis, click here
Other name(s): niacin ribonucleotidase; nicotinic acid mononucleotide glycohydrolase; nicotinic acid mononucleotide pyrophosphorylase; nicotinic acid phosphoribosyltransferase; nicotinate-nucleotide:diphosphate phospho-α-D-ribosyltransferase
Systematic name: 5-phospho-α-D-ribose 1-diphosphate:nicotinate ligase (ADP, diphosphate-forming)
Comments: The enzyme, which is involved in pyridine nucleotide recycling, can form β-nicotinate D-ribonucleotide and diphosphate from nicotinate and 5-phospho-α-D-ribose 1-diphosphate (PRPP) in the absence of ATP. However, when ATP is available the enzyme is phosphorylated resulting in a much lower Km for nicotinate. The phospho-enzyme is hydrolysed during the transferase reaction, regenerating the low affinity form. The presence of ATP shifts the products/substrates equilibrium from 0.67 to 1100 [4].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9030-26-6
References:
1.  Imsande, J. Pathway of diphosphopyridine nucleotide biosynthesis in Escherichia coli. J. Biol. Chem. 236 (1961) 1494–1497. [PMID: 13717628]
2.  Imsande, J. and Handler, P. Biosynthesis of diphosphopyridine nucleotide. III. Nicotinic acid mononucleotide pyrophosphorylase. J. Biol. Chem. 236 (1961) 525–530. [PMID: 13717627]
3.  Kosaka, A., Spivey, H.O. and Gholson, R.K. Nicotinate phosphoribosyltransferase of yeast. Purification and properties. J. Biol. Chem. 246 (1971) 3277–3283. [PMID: 4324895]
4.  Vinitsky, A. and Grubmeyer, C. A new paradigm for biochemical energy coupling. Salmonella typhimurium nicotinate phosphoribosyltransferase. J. Biol. Chem. 268 (1993) 26004–26010. [PMID: 7503993]
[EC 6.3.4.21 created 1961 as EC 2.4.2.11, transferred 2013 to EC 6.3.4.21]
 
 


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