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Record Information
Version3.6
Creation Date2005-11-16 15:48:42 UTC
Update Date2014-06-12 22:33:26 UTC
HMDB IDHMDB00175
Secondary Accession NumbersNone
Metabolite Identification
Common NameInosinic acid
DescriptionInosinic acid is a purine nucleotide which has hypoxanthine as the base and one phosphate group esterified to the sugar moiety. Inosinic acid is a nucleotide present in muscle and other tissues. It is formed by the deamination of AMP and when hydrolysed produces inosine. Inosinic acid is the ribonucleotide of hypoxanthine and is the first compound formed during the synthesis of purine. (Wikipedia).
Structure
Thumb
Synonyms
  1. 5'-IMP
  2. 5'-Inosinate
  3. 5'-Inosine monophosphate
  4. 5'-Inosinic acid
  5. IMP
  6. Inosine 5'-monophosphate
  7. Inosine 5'-phosphate
  8. Inosine Monophosphate
  9. Inosine-5'-monophosphate
Chemical FormulaC10H13N4O8P
Average Molecular Weight348.206
Monoisotopic Molecular Weight348.047099924
IUPAC Name{[(2R,3S,4R,5R)-3,4-dihydroxy-5-(6-oxo-6,9-dihydro-1H-purin-9-yl)oxolan-2-yl]methoxy}phosphonic acid
Traditional IUPAC Name[(2R,3S,4R,5R)-3,4-dihydroxy-5-(6-oxo-1H-purin-9-yl)oxolan-2-yl]methoxyphosphonic acid
CAS Registry Number131-99-7
SMILES
O[C@@H]1[C@@H](COP(O)(O)=O)O[C@H]([C@@H]1O)N1C=NC2=C1N=CNC2=O
InChI Identifier
InChI=1S/C10H13N4O8P/c15-6-4(1-21-23(18,19)20)22-10(7(6)16)14-3-13-5-8(14)11-2-12-9(5)17/h2-4,6-7,10,15-16H,1H2,(H,11,12,17)(H2,18,19,20)/t4-,6-,7-,10-/m1/s1
InChI KeyGRSZFWQUAKGDAV-KQYNXXCUSA-N
Chemical Taxonomy
KingdomOrganic Compounds
Super ClassNucleosides, Nucleotides, and Analogues
ClassPurine Nucleotides
Sub ClassPurine Ribonucleotides
Other Descriptors
  • Aromatic Heteropolycyclic Compounds
  • inosine phosphate(ChEBI)
  • purine ribonucleoside 5'-monophosphate(ChEBI)
Substituents
  • 1,2 Diol
  • 1 Phosphoribosyl Imidazole
  • Glycosyl Compound
  • Hypoxanthine
  • Imidazole
  • Imidazopyrimidine
  • Monosaccharide Phosphate
  • N Glycosyl Compound
  • Organic Hypophosphite
  • Organic Phosphite
  • Oxolane
  • Pentose Monosaccharide
  • Phosphoric Acid Ester
  • Purine
  • Purinone
  • Pyrimidine
  • Pyrimidone
  • Saccharide
  • Secondary Alcohol
Direct ParentPurine Ribonucleoside Monophosphates
Ontology
StatusDetected and Quantified
Origin
  • Endogenous
Biofunction
  • Component of Alanine and aspartate metabolism
  • Component of Purine metabolism
ApplicationNot Available
Cellular locations
  • Cytoplasm
  • Extracellular
  • Mitochondria
Physical Properties
StateSolid
Experimental Properties
PropertyValueReference
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
PropertyValueSource
water solubility3.05 g/LALOGPS
logP-2ALOGPS
logP-2.9ChemAxon
logS-2.1ALOGPS
pKa (strongest acidic)1.32ChemAxon
pKa (strongest basic)0.51ChemAxon
physiological charge-2ChemAxon
hydrogen acceptor count9ChemAxon
hydrogen donor count5ChemAxon
polar surface area175.73ChemAxon
rotatable bond count4ChemAxon
refractivity72.2ChemAxon
polarizability29.14ChemAxon
Spectra
SpectraGC-MSMS/MSLC-MS1D NMR2D NMR
Biological Properties
Cellular Locations
  • Cytoplasm
  • Extracellular
  • Mitochondria
Biofluid Locations
  • Blood
  • Cellular Cytoplasm
  • Cerebrospinal Fluid (CSF)
Tissue Location
  • All Tissues
Pathways
NameSMPDB LinkKEGG Link
Purine MetabolismSMP00050map00230
Normal Concentrations
BiofluidStatusValueAgeSexConditionReferenceDetails
BloodDetected and Quantified63.0 +/- 41.0 uMAdult (>18 years old)BothNormal details
Cellular CytoplasmDetected and Quantified10 uMAdult (>18 years old)BothNormal details
Cerebrospinal Fluid (CSF)Detected and Quantified3.19 (0.00 +/- 19.70) uMAdult (>18 years old)BothNormal details
Abnormal Concentrations
BiofluidStatusValueAgeSexConditionReferenceDetails
Cerebrospinal Fluid (CSF)Detected and Quantified2.31(0.00-41.40) uMAdult (>18 years old)BothSimple febrile seizures details
Cerebrospinal Fluid (CSF)Detected and Quantified2.48 (0.00 +/- 27.20) uMAdult (>18 years old)BothComplex febrile seizures details
Associated Disorders and Diseases
Disease References
Febrile seizures
  1. Rodriguez-Nunez A, Cid E, Rodriguez-Garcia J, Camina F, Rodriguez-Segade S, Castro-Gago M: Cerebrospinal fluid purine metabolite and neuron-specific enolase concentrations after febrile seizures. Brain Dev. 2000 Oct;22(7):427-31. Pubmed: 11102727
Associated OMIM IDs
DrugBank IDNot Available
DrugBank Metabolite IDNot Available
Phenol Explorer Compound IDNot Available
Phenol Explorer Metabolite IDNot Available
FoodDB IDFDB021901
KNApSAcK IDNot Available
Chemspider ID8264
KEGG Compound IDC00130
BioCyc IDIMP
BiGG ID33960
Wikipedia LinkInosinic acid
NuGOwiki LinkHMDB00175
Metagene LinkHMDB00175
METLIN ID5196
PubChem Compound8582
PDB IDIMP
ChEBI ID17202
References
Synthesis ReferencePark, Yeong Hun; Cho, Gwang Myeong; Baek, Min Ji; Hong, Guk Gi; Lee, Jin Nam. Method for preparing 5'-inosinic acid by using microbe capable of over-expressing purC gene. Repub. Korea (2007), 7pp.
Material Safety Data Sheet (MSDS)Download (PDF)
General References
  1. Nakayama Y, Kinoshita A, Tomita M: Dynamic simulation of red blood cell metabolism and its application to the analysis of a pathological condition. Theor Biol Med Model. 2005 May 9;2(1):18. Pubmed: 15882454
  2. McConell GK, Shinewell J, Stephens TJ, Stathis CG, Canny BJ, Snow RJ: Creatine supplementation reduces muscle inosine monophosphate during endurance exercise in humans. Med Sci Sports Exerc. 2005 Dec;37(12):2054-61. Pubmed: 16331129
  3. Castro-Gago M, Cid E, Trabazo S, Pavon P, Camina F, Rodriguez-Segade S, Einis Punal J, Rodriguez-Nunez A: Cerebrospinal fluid purine metabolites and pyrimidine bases after brief febrile convulsions. Epilepsia. 1995 May;36(5):471-4. Pubmed: 7614924
  4. Green HJ, Grant SM, Phillips SM, Enns DL, Tarnopolsky MA, Sutton JR: Reduced muscle lactate during prolonged exercise following induced plasma volume expansion. Can J Physiol Pharmacol. 1997 Dec;75(12):1280-6. Pubmed: 9534937
  5. Rodriguez-Nunez A, Cid E, Rodriguez-Garcia J, Camina F, Rodriguez-Segade S, Castro-Gago M: Concentrations of nucleotides, nucleosides, purine bases, oxypurines, uric acid, and neuron-specific enolase in the cerebrospinal fluid of children with sepsis. J Child Neurol. 2001 Sep;16(9):704-6. Pubmed: 11575617
  6. Pouw EM, Schols AM, van der Vusse GJ, Wouters EF: Elevated inosine monophosphate levels in resting muscle of patients with stable chronic obstructive pulmonary disease. Am J Respir Crit Care Med. 1998 Feb;157(2):453-7. Pubmed: 9476857
  7. Allison AC, Eugui EM: Purine metabolism and immunosuppressive effects of mycophenolate mofetil (MMF). Clin Transplant. 1996 Feb;10(1 Pt 2):77-84. Pubmed: 8680053
  8. van Hall G, van der Vusse GJ, Soderlund K, Wagenmakers AJ: Deamination of amino acids as a source for ammonia production in human skeletal muscle during prolonged exercise. J Physiol. 1995 Nov 15;489 ( Pt 1):251-61. Pubmed: 8583409
  9. McConell G, Snow RJ, Proietto J, Hargreaves M: Muscle metabolism during prolonged exercise in humans: influence of carbohydrate availability. J Appl Physiol. 1999 Sep;87(3):1083-6. Pubmed: 10484580
  10. Klupp J, Pfitzmann R, Langrehr JM, Neuhaus P: Indications of mycophenolate mofetil in liver transplantation. Transplantation. 2005 Sep 27;80(1 Suppl):S142-6. Pubmed: 16286893
  11. Bangsbo J, Gollnick PD, Graham TE, Juel C, Kiens B, Mizuno M, Saltin B: Anaerobic energy production and O2 deficit-debt relationship during exhaustive exercise in humans. J Physiol. 1990 Mar;422:539-59. Pubmed: 2352192
  12. McCauley TG, Hamaguchi N, Stanton M: Aptamer-based biosensor arrays for detection and quantification of biological macromolecules. Anal Biochem. 2003 Aug 15;319(2):244-50. Pubmed: 12871718
  13. Rush JW, MacLean DA, Hultman E, Graham TE: Exercise causes branched-chain oxoacid dehydrogenase dephosphorylation but not AMP deaminase binding. J Appl Physiol. 1995 Jun;78(6):2193-200. Pubmed: 7665417
  14. McConell GK, Canny BJ, Daddo MC, Nance MJ, Snow RJ: Effect of carbohydrate ingestion on glucose kinetics and muscle metabolism during intense endurance exercise. J Appl Physiol. 2000 Nov;89(5):1690-8. Pubmed: 11053315
  15. Swart PJ, Beljaars E, Smit C, Pasma A, Schuitemaker H, Meijer DK: Comparative pharmacokinetic, immunologic and hematologic studies on the anti-HIV-1/2 compounds aconitylated and succinylated HSA. J Drug Target. 1996;4(2):109-16. Pubmed: 8894971
  16. Scott GS, Spitsin SV, Kean RB, Mikheeva T, Koprowski H, Hooper DC: Therapeutic intervention in experimental allergic encephalomyelitis by administration of uric acid precursors. Proc Natl Acad Sci U S A. 2002 Dec 10;99(25):16303-8. Epub 2002 Nov 25. Pubmed: 12451183

Enzymes

General function:
Involved in deaminase activity
Specific function:
AMP deaminase plays a critical role in energy metabolism.
Gene Name:
AMPD1
Uniprot ID:
P23109
Molecular weight:
90218.455
Reactions
Adenosine monophosphate + Water → Inosinic acid + Ammoniadetails
General function:
Involved in adenylosuccinate synthase activity
Specific function:
Component of the purine nucleotide cycle (PNC), which interconverts IMP and AMP to regulate the nucleotide levels in various tissues, and which contributes to glycolysis and ammoniagenesis. Catalyzes the first committed step in the biosynthesis of AMP from IMP (By similarity).
Gene Name:
ADSSL1
Uniprot ID:
Q8N142
Molecular weight:
50208.16
Reactions
Guanosine triphosphate + Inosinic acid + L-Aspartic acid → Guanosine diphosphate + Phosphoric acid + Adenylsuccinic aciddetails
Guanosine triphosphate + Inosinic acid + L-Aspartic acid → Guanosine diphosphate + Phosphoric acid + N(6)-(1,2-dicarboxyethyl)AMPdetails
General function:
Involved in IMP cyclohydrolase activity
Specific function:
Bifunctional enzyme that catalyzes 2 steps in purine biosynthesis.
Gene Name:
ATIC
Uniprot ID:
P31939
Molecular weight:
64615.255
Reactions
Inosinic acid + Water → Phosphoribosyl formamidocarboxamidedetails
General function:
Involved in catalytic activity
Specific function:
Catalyzes the irreversible NADPH-dependent deamination of GMP to IMP. It functions in the conversion of nucleobase, nucleoside and nucleotide derivatives of G to A nucleotides, and in maintaining the intracellular balance of A and G nucleotides.
Gene Name:
GMPR
Uniprot ID:
P36959
Molecular weight:
37418.58
Reactions
Inosinic acid + Ammonia + NADP → Guanosine monophosphate + NADPHdetails
Inosinic acid + Ammonia + NADP → Guanosine monophosphate + NADPH + Hydrogen Iondetails
General function:
Involved in catalytic activity
Specific function:
Inosine 5'-phosphate + NAD(+) + H(2)O = xanthosine 5'-phosphate + NADH
Gene Name:
IMPDH1
Uniprot ID:
A4D0Z6
Molecular weight:
64319.3
General function:
Involved in hypoxanthine phosphoribosyltransferase activity
Specific function:
Converts guanine to guanosine monophosphate, and hypoxanthine to inosine monophosphate. Transfers the 5-phosphoribosyl group from 5-phosphoribosylpyrophosphate onto the purine. Plays a central role in the generation of purine nucleotides through the purine salvage pathway.
Gene Name:
HPRT1
Uniprot ID:
P00492
Molecular weight:
24579.155
Reactions
Inosinic acid + Pyrophosphate → Hypoxanthine + Phosphoribosyl pyrophosphatedetails
General function:
Involved in catalytic activity
Specific function:
Catalyzes the conversion of inosine 5'-phosphate (IMP) to xanthosine 5'-phosphate (XMP), the first committed and rate-limiting step in the de novo synthesis of guanine nucleotides, and therefore plays an important role in the regulation of cell growth. Could also have a single-stranded nucleic acid-binding activity and could play a role in RNA and/or DNA metabolism. It may also have a role in the development of malignancy and the growth progression of some tumors.
Gene Name:
IMPDH2
Uniprot ID:
P12268
Molecular weight:
55804.495
Reactions
Inosinic acid + NAD + Water → Xanthylic acid + NADHdetails
Inosinic acid + NAD + Water → Xanthylic acid + NADH + Hydrogen Iondetails
General function:
Involved in catalytic activity
Specific function:
Catalyzes the irreversible NADPH-dependent deamination of GMP to IMP. It functions in the conversion of nucleobase, nucleoside and nucleotide derivatives of G to A nucleotides, and in maintaining the intracellular balance of A and G nucleotides. Plays a role in modulating cellular differentiation.
Gene Name:
GMPR2
Uniprot ID:
Q9P2T1
Molecular weight:
37874.125
Reactions
Inosinic acid + Ammonia + NADP → Guanosine monophosphate + NADPHdetails
Inosinic acid + Ammonia + NADP → Guanosine monophosphate + NADPH + Hydrogen Iondetails
General function:
Involved in phosphorylase activity
Specific function:
Phosphorylase is an important allosteric enzyme in carbohydrate metabolism. Enzymes from different sources differ in their regulatory mechanisms and in their natural substrates. However, all known phosphorylases share catalytic and structural properties.
Gene Name:
PYGB
Uniprot ID:
P11216
Molecular weight:
96695.18
General function:
Involved in phosphorylase activity
Specific function:
Phosphorylase is an important allosteric enzyme in carbohydrate metabolism. Enzymes from different sources differ in their regulatory mechanisms and in their natural substrates. However, all known phosphorylases share catalytic and structural properties.
Gene Name:
PYGL
Uniprot ID:
P06737
Molecular weight:
93133.25
General function:
Involved in phosphorylase activity
Specific function:
Phosphorylase is an important allosteric enzyme in carbohydrate metabolism. Enzymes from different sources differ in their regulatory mechanisms and in their natural substrates. However, all known phosphorylases share catalytic and structural properties.
Gene Name:
PYGM
Uniprot ID:
P11217
Molecular weight:
87316.355
General function:
Involved in metal ion binding
Specific function:
Dephosphorylates the 5' and 2'(3')-phosphates of deoxyribonucleotides, with a preference for dUMP and dTMP, intermediate activity towards dGMP, and low activity towards dCMP and dAMP.
Gene Name:
NT5C
Uniprot ID:
Q8TCD5
Molecular weight:
Not Available
Reactions
Inosinic acid + Water → Inosine + Phosphoric aciddetails
General function:
Involved in magnesium ion binding
Specific function:
Can act both as nucleotidase and as phosphotransferase.
Gene Name:
NT5C3
Uniprot ID:
Q9H0P0
Molecular weight:
33914.91
Reactions
Inosinic acid + Water → Inosine + Phosphoric aciddetails
General function:
Involved in phosphatase activity
Specific function:
Dephosphorylates specifically the 5' and 2'(3')-phosphates of uracil and thymine deoxyribonucleotides, and so protects mitochondrial DNA replication from excess dTTP. Has only marginal activity towards dIMP and dGMP.
Gene Name:
NT5M
Uniprot ID:
Q9NPB1
Molecular weight:
Not Available
Reactions
Inosinic acid + Water → Inosine + Phosphoric aciddetails
General function:
Involved in nucleotide binding
Specific function:
Dephosphorylates the 5' and 2'(3')-phosphates of deoxyribonucleotides and has a broad substrate specificity. Helps to regulate adenosine levels in heart during ischemia and hypoxia.
Gene Name:
NT5C1A
Uniprot ID:
Q9BXI3
Molecular weight:
41020.145
Reactions
Inosinic acid + Water → Inosine + Phosphoric aciddetails
General function:
Involved in nucleotide binding
Specific function:
Dephosphorylates the 5' and 2'(3')-phosphates of deoxyribonucleotides. Helps to regulate adenosine levels (By similarity).
Gene Name:
NT5C1B
Uniprot ID:
Q96P26
Molecular weight:
68803.055
Reactions
Inosinic acid + Water → Inosine + Phosphoric aciddetails
General function:
Involved in deaminase activity
Specific function:
AMP deaminase plays a critical role in energy metabolism.
Gene Name:
AMPD2
Uniprot ID:
Q01433
Molecular weight:
100686.95
Reactions
Adenosine monophosphate + Water → Inosinic acid + Ammoniadetails
General function:
Involved in hydrolase activity
Specific function:
Canalicular ectonucleoside NTPDase responsible for the main hepatic NTPDase activity. Ectonucleoside NTPDases catalyze the hydrolysis of gamma- and beta-phosphate residues of nucleotides, playing a central role in concentration of extracellular nucleotides. Has activity toward ATP, ADP, UTP and UDP, but not toward AMP.
Gene Name:
ENTPD8
Uniprot ID:
Q5MY95
Molecular weight:
53903.14
Reactions
IDP + Water → Inosinic acid + Phosphoric aciddetails
General function:
Involved in hydrolase activity
Specific function:
In the nervous system, could hydrolyze ATP and other nucleotides to regulate purinergic neurotransmission. Could also be implicated in the prevention of platelet aggregation by hydrolyzing platelet-activating ADP to AMP. Hydrolyzes ATP and ADP equally well.
Gene Name:
ENTPD1
Uniprot ID:
P49961
Molecular weight:
58706.0
Reactions
IDP + Water → Inosinic acid + Phosphoric aciddetails
General function:
Involved in calcium ion binding
Specific function:
Calcium-dependent nucleotidase with a preference for UDP. The order of activity with different substrates is UDP > GDP > UTP > GTP. Has very low activity towards ADP and even lower activity towards ATP. Does not hydrolyze AMP and GMP. Involved in proteoglycan synthesis.
Gene Name:
CANT1
Uniprot ID:
Q8WVQ1
Molecular weight:
44839.24
Reactions
IDP + Water → Inosinic acid + Phosphoric aciddetails
General function:
Involved in hydrolase activity
Specific function:
Not Available
Gene Name:
ENTPD4
Uniprot ID:
Q8NE73
Molecular weight:
64852.9
General function:
Involved in hydrolase activity
Specific function:
Pyrophosphatase that hydrolyzes the non-canonical purine nucleotides inosine triphosphate (ITP), deoxyinosine triphosphate (dITP) as well as 2'-deoxy-N-6-hydroxylaminopurine triposphate (dHAPTP) and xanthosine 5'-triphosphate (XTP) to their respective monophosphate derivatives. The enzyme does not distinguish between the deoxy- and ribose forms. Probably excludes non-canonical purines from RNA and DNA precursor pools, thus preventing their incorporation into RNA and DNA and avoiding chromosomal lesions.
Gene Name:
ITPA
Uniprot ID:
Q9BY32
Molecular weight:
16833.23
Reactions
Inosine triphosphate + Water → Inosinic acid + Pyrophosphatedetails
General function:
Involved in adenylosuccinate synthase activity
Specific function:
Plays an important role in the de novo pathway and in the salvage pathway of purine nucleotide biosynthesis. Catalyzes the first committed step in the biosynthesis of AMP from IMP.
Gene Name:
ADSS
Uniprot ID:
P30520
Molecular weight:
50097.075
Reactions
Guanosine triphosphate + Inosinic acid + L-Aspartic acid → Guanosine diphosphate + Phosphoric acid + Adenylsuccinic aciddetails
Guanosine triphosphate + Inosinic acid + L-Aspartic acid → Guanosine diphosphate + Phosphoric acid + N(6)-(1,2-dicarboxyethyl)AMPdetails
General function:
Involved in hydrolase activity
Specific function:
Has a threefold preference for the hydrolysis of ATP over ADP.
Gene Name:
ENTPD3
Uniprot ID:
O75355
Molecular weight:
59104.76
Reactions
IDP + Water → Inosinic acid + Phosphoric aciddetails
General function:
Involved in hydrolase activity
Specific function:
Might support glycosylation reactions in the Golgi apparatus and, when released from cells, might catalyze the hydrolysis of extracellular nucleotides. Hydrolyzes preferentially nucleoside 5'-diphosphates, nucleoside 5'-triphosphates are hydrolyzed only to a minor extent, there is no hydrolysis of nucleoside 5'-monophosphates. The order of activity with different substrates is GDP > IDP >> UDP = CDP >> ADP (By similarity).
Gene Name:
ENTPD6
Uniprot ID:
O75354
Molecular weight:
51159.26
Reactions
IDP + Water → Inosinic acid + Phosphoric aciddetails
General function:
Involved in hydrolase activity
Specific function:
Uridine diphosphatase (UDPase) that promotes protein N-glycosylation and ATP level regulation. UDP hydrolysis promotes protein N-glycosylation and folding in the endoplasmic reticulum, as well as elevated ATP consumption in the cytosol via an ATP hydrolysis cycle. Together with CMPK1 and AK1, constitutes an ATP hydrolysis cycle that converts ATP to AMP and results in a compensatory increase in aerobic glycolysis. Also hydrolyzes GDP and IDP but not any other nucleoside di-, mono- or triphosphates, nor thiamine pyrophosphate. Plays a key role in the AKT1-PTEN signaling pathway by promoting glycolysis in proliferating cells in response to phosphoinositide 3-kinase (PI3K) signaling (By similarity).
Gene Name:
ENTPD5
Uniprot ID:
O75356
Molecular weight:
47516.985
Reactions
IDP + Water → Inosinic acid + Phosphoric aciddetails
General function:
Involved in deaminase activity
Specific function:
AMP deaminase plays a critical role in energy metabolism.
Gene Name:
AMPD3
Uniprot ID:
Q01432
Molecular weight:
89727.485
Reactions
Adenosine monophosphate + Water → Inosinic acid + Ammoniadetails
General function:
Involved in 5'-nucleotidase activity
Specific function:
May have a critical role in the maintenance of a constant composition of intracellular purine/pyrimidine nucleotides in cooperation with other nucleotidases. Preferentially hydrolyzes inosine 5'-monophosphate (IMP) and other purine nucleotides.
Gene Name:
NT5C2
Uniprot ID:
P49902
Molecular weight:
64969.2
Reactions
Inosinic acid + Water → Inosine + Phosphoric aciddetails
General function:
Involved in hydrolase activity
Specific function:
Hydrolyzes extracellular nucleotides into membrane permeable nucleosides.
Gene Name:
NT5E
Uniprot ID:
P21589
Molecular weight:
57948.125
Reactions
Inosinic acid + Water → Inosine + Phosphoric aciddetails
General function:
Involved in hydrolase activity
Specific function:
Hydrolyzes preferentially nucleoside 5'-diphosphates, nucleoside 5'-triphosphates are hydrolyzed only to a minor extent. The order of activity with different substrates is UDP >> GDP = CDP = TDP, AMP, ADP, ATP and UMP are not substrates. Preferred substrates for isoform 2 are CTP, UDP, CDP, GTP and GDP, while isoform 1 utilizes UTP and TTP.
Gene Name:
ENTPD4
Uniprot ID:
Q9Y227
Molecular weight:
69419.915
Reactions
IDP + Water → Inosinic acid + Phosphoric aciddetails
General function:
Involved in catalytic activity
Specific function:
Catalyzes the conversion of inosine 5'-phosphate (IMP) to xanthosine 5'-phosphate (XMP), the first committed and rate-limiting step in the de novo synthesis of guanine nucleotides, and therefore plays an important role in the regulation of cell growth. Could also have a single-stranded nucleic acid-binding activity and could play a role in RNA and/or DNA metabolism. It may also have a role in the development of malignancy and the growth progression of some tumors.
Gene Name:
IMPDH1
Uniprot ID:
P20839
Molecular weight:
63252.24
Reactions
Inosinic acid + NAD + Water → Xanthylic acid + NADHdetails
Inosinic acid + NAD + Water → Xanthylic acid + NADH + Hydrogen Iondetails