of administration Inosine is a nucleoside that is formed when hypoxanthine is attached to a ribose ring also known as a ribofuranose via a N sub 9 sub glycosidic bond . Inosine is commonly found in tRNA ... of inosine metabolism has led to advances in immunotherapy in recent decades. Inosine monophosphate is oxidised by the enzyme inosine monophosphate dehydrogenase , yielding xanthosine monophosphate ... drug that acts as an inhibitor of inosine monophosphate dehydrogenase. It is used in the treatment ... deficiency resulting from IMD inhibition. Reactions Adenine is converted to adenosine or inosine monophosphate IMP , either of which, in turn, is converted into inosine I , which pairs with Adenine A , cytosine C , and uracil U . Purine nucleoside phosphorylase intraconverts inosine and hypoxanthine . Inosine is also an intermediate in a chain of purine nucleotides reactions required for muscle ... title Inosine supplementation has no effect on aerobic or anaerobic cycling performance journal ... author1 McNaughton L author2 Dalton B author3 Tarr J author separator , ref It has been shown that inosine ... title Secondary degeneration reduced by inosine after spinal cord injury in rats journal Spinal Cord .... ref cite journal title Inosine induces axonal rewiring and improves behavioral outcome after ... NCT00067327 Treatment of Multiple Sclerosis Using Over the Counter Inosine Full Text View ClinicalTrials.gov ... primer molecular biology primer s for polymerase chain reaction , inosine is useful in that it will indiscriminately ... efficiency. Fitness Despite lack of clinical evidence that it improves muscle development, inosine remains an ingredient in some fitness supplements. Feeding Stimulant Inosine has also been found to be an important ... of farmed fish . For example, inosine and inosine 5 monophosphate have been reported as specific feeding .... Fish., 50 645 651. ref The main problem of using inosine and or inosine 5 monophosphate as feeding ... to modulate inosine , causing knock out of viral load. See also Inosine monophosphate dehydrogenase ... more details
enzyme Name inosine kinase EC number 2.7.1.73 CAS number 37237 46 0 IUBMB EC number 2 7 1 73 GO code 0008906 image width caption In enzymology , an inosine kinase EC number 2.7.1.73 is an enzyme that catalysis catalyzes the chemical reaction ATP inosine math rightleftharpoons math ADP IMP Thus, the two substrate biochemistry substrates of this enzyme are adenosine triphosphate ATP and inosine , whereas its two product chemistry products are adenosine diphosphate ADP and IMP . This enzyme belongs to the family of transferase s, specifically those transferring phosphorus containing groups phosphotransferase s with an alcohol group as acceptor. The systematic name of this enzyme class is ATP inosine 5 phosphotransferase . Other names in common use include inosine guanosine kinase , and inosine kinase phosphorylating . This enzyme participates in purine metabolism . References reflist 1 cite journal author Pierre KJ, LePage GA date 1968 title Formation of inosine 5 monophosphate by a kinase in cell free extracts of Ehrlich ascites cells in vitro journal Proc. Soc. Exp. Biol. Med. volume 127 pages 432&ndash 40 pmid 5645030 issue 2 enzyme stub Category EC 2.7.1 Category Enzymes of unknown structure ... more details
enzyme Name inosine nucleosidase EC number 3.2.2.2 CAS number 9030 95 9 IUBMB EC number 3 2 2 2 GO code 0047724 image width caption In enzymology , an inosine nucleosidase EC number 3.2.2.2 is an enzyme that catalysis catalyzes the chemical reaction inosine H sub 2 sub O math rightleftharpoons math D ribose hypoxanthine Thus, the two substrate biochemistry substrates of this enzyme are inosine and water H sub 2 sub O , whereas its two product chemistry products are D ribose and hypoxanthine . This enzyme belongs to the family of hydrolase s, specifically those glycosylases that hydrolyse N glycosyl compounds. The systematic name of this enzyme class is inosine ribohydrolase . Other names in common use include inosinase , and inosine guanosine nucleosidase . This enzyme participates in purine metabolism . References reflist 1 cite journal author KOCH AL date 1956 title Some enzymes of nucleoside metabolism of Escherichia coli journal J. Biol. Chem. volume 223 pages 535&ndash 49 pmid 13376622 issue 1 cite journal author Tarr HLA date 1955 title Fish muscle riboside hydrolases journal Biochem. J. volume 59 pages 386&ndash 391 hydrolase stub Category EC 3.2.2 Category Enzymes of unknown structure ... more details
chembox ImageFile Inosine pranobex.png ImageSize 150px IUPACName 9 2 R ,3 R ,4 S ,5 R 3,4 dihydroxy 5 hydroxymethyl oxolan 2 yl 3 H purin 6 one 4 acetamidobenzoic acid 1 dimethylamino propan 2 ol OtherNames Isoprinosine Methisoprinol Section1 Chembox Identifiers ChemSpiderID 16736312 InChI1 1 C10H12N4O5.C9H9NO3.C5H13NO c15 1 4 6 16 7 17 10 19 4 14 3 13 5 8 14 11 2 12 9 5 18 1 6 11 10 8 4 2 7 3 5 8 9 12 13 1 5 7 4 6 2 3 h2 4,6 7,10,15 17H,1H2, H,11,12,18 2 5H,1H3, H,10,11 H,12,13 5,7H,4H2,1 3H3 t4 ,6 ,7 ,10 m0.. s1 InChIKey1 PBJNZCQJMWVIRT MDQYBHOLBR CASNo 36703 88 5 PubChem 37510 KEGG D01995 SMILES CN C CC C O.OC O c1ccc NC C O cc1.Oc3ncnc2c3ncn2 C H 1O C H CO C H O C H 1O Section2 Chembox Properties Formula C sub 52 sub H sub 78 sub N sub 10 sub O sub 17 sub MolarMass 1115.23 g mol Appearance Density MeltingPt BoilingPt Solubility Section3 Chembox Hazards MainHazards FlashPt Autoignition Inosine pranobex Isoprinosine or Methisoprinol is a combinatinon of inosine , acetamidobenzoic acid , and dimethylaminoisopropanol used as an antiviral drug . Inosine pranobex has no effect on viral cells itself. It acts as a powerful immunostimulant . It is most commonly used to treat the rare measles complication subacute sclerosing panencephalitis in conjunction with intrathecal interferon therapy, with promising results. pharma stub Category Antivirals fr Inosine pranobex ja pl Pranobeks inozyny ... more details
protein Name adenylosuccinate synthase caption image width HGNCid 292 Symbol ADSS AltSymbols EntrezGene 159 OMIM 103060 RefSeq NM 001126 UniProt P30520 PDB ECnumber 6.3.4.4 Chromosome 1 Arm q Band 44 LocusSupplementaryData Adenylosuccinate synthase or adenylosuccinate synthetase is an enzyme that converts Inosine monophosphate IMP to adenylosuccinate as part of the purine nucleotide cycle . External links MeshName Adenylosuccinate synthase ligase stub Ligases Nucleotide metabolism ... more details
Orphan date February 2009 PBB geneid 3704 Inosine triphosphate pyrophosphatase is an enzyme that in humans is encoded by the ITPA gene . ref name pmid11278832 cite journal author Lin S, McLennan AG, Ying K, Wang Z, Gu S, Jin H, Wu C, Liu W, Yuan Y, Tang R, Xie Y, Mao Y title Cloning, expression, and characterization of a human inosine triphosphate pyrophosphatase encoded by the itpa gene journal J Biol Chem volume 276 issue 22 pages 18695 701 year 2001 month May pmid 11278832 pmc doi 10.1074 jbc.M011084200 ref ref name entrez cite web title Entrez Gene ITPA inosine triphosphatase nucleoside triphosphate pyrophosphatase url http www.ncbi.nlm.nih.gov sites entrez?Db gene&Cmd ShowDetailView&TermToSearch 3704 accessdate ref The PBB Summary template is automatically maintained by Protein Box Bot. See Template PBB Controls to Stop updates. PBB Summary section title summary text The protein encoded by this gene hydrolyzes inosine triphosphate and deoxyinosine triphosphate to the monophosphate ..., is found in the cytoplasm and acts as a homodimer. Defects in the encoded protein can result in inosine ... ITPA inosine triphosphatase nucleoside triphosphate pyrophosphatase url http www.ncbi.nlm.nih.gov ... K title Human inosine triphosphatase catalytic properties and population studies. journal Clin. Chim ... journal author Fraser JH, Meyers H, Henderson JF, et al. title Individual variation in inosine triphosphate ..., Arenas M, et al. title Genetic basis of inosine triphosphate pyrophosphohydrolase deficiency. journal ... z cite journal author Cao H, Hegele RA title DNA polymorphisms in ITPA including basis of inosine triphosphatase ... AM, Sumi S, Arenas M, et al. title Allele frequency of inosine triphosphate pyrophosphatase gene ... T, Sumi S, Ueta A, et al. title Genetic basis of inosine triphosphate pyrophosphohydrolase deficiency ... Structure of the orthorhombic form of human inosine triphosphate pyrophosphatase. journal Acta Crystallogr ... structure of human inosine triphosphatase. Substrate binding and implication of the inosine triphosphatase ... more details
Orphan date May 2009 merge Adenylosuccinate date March 2011 Adenylsuccinate is an intermediate in the intercoversion of purine nucleotide s inosine monophosphate IMP and adenosine monophosphate AMP . It is formed by the addition of aspartate to IMP and requires the input of energy from a phosphoanhydride bond in the form of Guanosine triphosphate GTP . GTP is used instead of Adenosine triphosphate ATP , so the reaction is not dependent on its products. References See Figures 20.4 and 20.7 in Textbook of Biochemistry , with clinical correlations, Sixth Edition, Thomas M. Devlin, Ed., Wiley Liss, Inc., New York, NY, 2006. Category Nucleotides biochem stub ... more details
ATIC can refer to ATIC Records ATIC, a gene which codes inosine monophosphate synthase Advanced Thin Ionization Calorimeter , a balloon borne experiment to detect cosmic rays Advanced Technical Intelligence Center , an educational institution focusing on technical intelligence Atic Atac , a video game for the ZX Spectrum Advanced Technology Investment Company , an investment company from Abu Dhabi , owned by Mubadala Development Company . Australian Transformation and Innovation Centre , a computer laboratory run by Thales Australia See also Attic disambiguation disambig de ATIC ... more details
chembox ImageFile Xanthosine monophosphate.svg ImageSize IUPACName OtherNames Section1 Chembox Identifiers CASNo 523 98 8 PubChem 122280 SMILES MeSHName Xanthosine monophosphate Section2 Chembox Properties Formula C sub 10 sub H sub 13 sub N sub 4 sub O sub 9 sub P MolarMass 364.206 g mol Appearance Density MeltingPt BoilingPt Solubility Section3 Chembox Hazards MainHazards FlashPt Autoignition Xanthosine monophosphate is an intermediate in purine metabolism , formed from Inosine monophosphate IMP , and forming Guanosine monophosphate GMP . It is a ribonucleoside monophosphate . Clinical significance Xanthylic acid can be used in quantitative measurements of the inosine monophosphate dehydrogenase enzyme activities in purine metabolism, as recommended to ensure optimal thiopurine therapy for children with acute lymphoblastic leukaemia ALL . ref name pmid16725387 cite journal author Khalil PN, Erb N, Khalil MN, Escherich G, Janka Schaub GE title Validation and application of a high performance liquid chromatographic based assay for determination of the inosine 5 monophosphate dehydrogenase activity in erythrocytes journal J. Chromatogr. B Analyt. Technol. Biomed. Life Sci. volume 842 issue 1 pages 1 7 year 2006 month September pmid 16725387 doi 10.1016 j.jchromb.2006.04.040 url http linkinghub.elsevier.com retrieve pii S1570 0232 06 00373 4 ref See also Ribonucleoside monophosphate Xanthosine References reflist Nucleotide metabolism intermediates Category Nucleotides Category Purines biochem stub ja fi Ksantosiinimonofosfaatti ... more details
enzyme Name IMP dehydrogenase EC number 1.1.1.205 CAS number 9028 93 7 IUBMB EC number 1 1 1 205 GO code 0003938 image PDB 1meh EBI.jpg width caption Structure of IMPDH ref name pmid12559919 cite journal author Prosise GL, Luecke H title Crystal structures of Tritrichomonasfoetus inosine monophosphate dehydrogenase in complex with substrate, cofactor and analogs a structural basis for the random in ordered out kinetic mechanism journal J. Mol. Biol. volume 326 issue 2 pages 517 27 year 2003 month February pmid 12559919 doi 10.1016 S0022 2836 02 01383 9 url ref IMP dehydrogenase is an enzyme that converts inosine monophosphate to xanthosine monophosphate ref name pmid13428767 cite journal author Magasanik B, Moyed HS, Gehring LB. title Enzymes essential for the biosynthesis of nucleic acid guanine inosine 5 phosphate dehydrogenase of Aerobacter aerogenes journal J. Biol. Chem. volume 226 issue 1 pages 339 50 year 1957 month May pmid 13428767 doi url issn ref ref name pmid13778733 cite journal author Turner JF, King JE title Inosine 5 phosphate dehydrogenase of pea seeds journal Biochem. J. volume 79 issue pages 147 51 year 1961 month April pmid 13778733 pmc 1205560 doi url issn ref ref name pmid19480389 cite journal author Hedstrom L title IMP dehydrogenase structure, mechanism, and inhibition journal Chem. Rev. volume 109 issue 7 pages 2903 28 year 2009 month July pmid 19480389 doi 10.1021 cr900021w url issn pmc 2737513 ref ref name pmid18990827 cite journal author Pimkin M, Markham GD title Inosine 5 monophosphate dehydrogenase journal Adv. Enzymol. Relat. Areas Mol. Biol. volume 76 issue pages 1 53 year 2009 pmid 18990827 doi url issn ref inosine monophosphate inosine 5 phosphate nicotinamide adenine dinucleotide NAD sup sup water H sub 2 sub O xanthosine monophosphate xanthosine 5 phosphate NADH H sup sup The structure of this enzyme is composed of a TIM barrel domain with two CBS domain s inserted within a loop. ref name pmid12559919 ref name pmid19480389 It is ... more details
Many organisms have metabolic pathway s to synthesize and break down purine s. Synthesis Purines are biologically synthesized as nucleotide s bases attached to ribose 5 phosphate . A key regulatory step is the production of ribose 5 phospho D ribosyl 1 pyrophosphate PRPP by PRPP synthetase, which is activated by inorganic phosphate and inactivated by purine ribonucleotides. It is not the committed step to purine synthesis because PRPP is also used in pyrimidine synthesis and salvage pathways. The first committed step is the reaction of PRPP, glutamine and water to 5 phosphoribosylamine, glutamine, and pyrophosphate catalyzed by pyrophosphate amidotransferase, which is activated by PRPP and inhibited by AMP, GMP and IMP. Both adenine and guanine are derived from the nucleotide inosine monophosphate IMP , which is synthesised on a pre existing ribose phosphate through a complex pathway using atoms from the amino acids glycine , glutamine , and aspartic acid , as well as formate ions transferred from the coenzyme folic acid tetrahydrofolate . GMP IMP dehydrogenase converts IMP into Xanthosine monophosphate XMP GMP synthase converts XMP into guanine monophosphate GMP GMP reductase converts GMP back into IMP AMP adenylosuccinate synthase converts IMP to adenylosuccinate adenylosuccinate lyase converts adenylosuccinate into Adenosine monophosphate AMP AMP deaminase converts AMP back into IMP Degradation Purines are metabolised by several enzyme s Guanine A nuclease frees the nucleotide A nucleotidase creates guanosine Purine nucleoside phosphorylase converts guanosine to guanine Guanase converts guanine to xanthine Xanthine oxidase a form of xanthine oxidoreductase catalyzes the oxidation of xanthine to uric acid Adenine A nuclease frees the nucleotide A nucleotidase creates adenosine , then adenosine deaminase creates inosine Alternatively, AMP deaminase creates inosinic acid , then a nucleotidase creates inosine Purine nucleoside phosphorylase acts upon inosine to cre ... more details
enzyme Name nucleoside diphosphatase EC number 3.6.1.6 CAS number 9027 69 4 IUBMB EC number 3 6 1 6 GO code 0017110 image width caption In enzymology , a nucleoside diphosphatase EC number 3.6.1.6 is an enzyme that catalysis catalyzes the chemical reaction a nucleoside diphosphate H sub 2 sub O math rightleftharpoons math a nucleotide phosphate Thus, the two substrate biochemistry substrates of this enzyme are nucleoside diphosphate and water H sub 2 sub O , whereas its two product chemistry products are nucleotide and phosphate . This enzyme belongs to the family of hydrolase s, specifically those acting on acid anhydrides in phosphorus containing anhydrides. The systematic name of this enzyme class is nucleoside diphosphate phosphohydrolase . Other names in common use include thiaminpyrophosphatase , UDPase , inosine diphosphatase , adenosine diphosphatase , IDPase , ADPase , adenosinepyrophosphatase , guanosine diphosphatase , guanosine 5 diphosphatase , inosine 5 diphosphatase , uridine diphosphatase , uridine 5 diphosphatase , nucleoside diphosphate phosphatase , type B nucleoside diphosphatase , GDPase , CDPase , nucleoside 5 diphosphatase , type L nucleoside diphosphatase , NDPase , and nucleoside diphosphate phosphohydrolase . This enzyme participates in purine metabolism and pyrimidine metabolism . Structural studies As of late 2007, two tertiary structure structures have been solved for this class of enzymes, with Protein Data Bank PDB accession codes PDB link 2H2N and PDB link 2H2U . References reflist 1 cite journal author GIBSON DM, AYENGAR P, SANADI DR date 1955 title A phosphatase specific for nucleoside diphosphates journal Biochim. Biophys. Acta. volume 16 pages 536&ndash 8 pmid 14389272 doi 10.1016 0006 3002 55 90275 4 issue 4 cite journal author Horecker BL, Hurwitz J and Heppel LA date 1957 title The synthesis of ribose 5 pyrophosphate and ribose 5 triphosphate journal J. Am. Chem. Soc. volume 79 pages 701&ndash 702 doi 10.1021 ja01560a054 hydrol ... more details
PBB geneid 3615 Inosine 5 monophosphate dehydrogenase 2 , also known as IMP dehydrogenase 2 , is an enzyme that in humans is encoded by the IMPDH2 gene . ref name entrez cite web title Entrez Gene IMP inosine monophosphate dehydrogenase 2 url http www.ncbi.nlm.nih.gov sites entrez?Db gene&Cmd ShowDetailView&TermToSearch 3615 accessdate ref ref name pmid1969416 cite journal author Natsumeda Y, Ohno S, Kawasaki H, Konno Y, Weber G, Suzuki K title Two distinct cDNAs for human IMP dehydrogenase journal J. Biol. Chem. volume 265 issue 9 pages 5292 5 year 1990 month March pmid 1969416 doi url issn ref ref name pmid9858805 cite journal author Kost Alimova MV, Glesne DA, Huberman E, Zelenin AV title Assignment1 of inosine monophosphate dehydrogenase type 2 IMPDH2 to human chromosome band 3p21.2 by in situ hybridization journal Cytogenet. Cell Genet. volume 82 issue 3 4 pages 145 6 year 1998 pmid 9858805 doi url issn ref Function IMP dehydrogenase 2 is the rate limiting enzyme in the de novo guanine nucleotide biosynthesis. It is thus involved in maintaining cellular guanine deoxy and ribonucleotide pools needed for DNA and RNA synthesis. IMPDH2 catalyzes the NAD dependent oxidation of inosinic acid inosine 5 monophosphate into xanthosine monophosphate xanthine 5 monophosphate , which is then converted into guanosine monophosphate guanosine 5 monophosphate . ref name entrez Clinical significance ... in human inosine 5 monophosphate dehydrogenase 2 is associated with diminished enzyme activity. journal ..., Sunder Plassmann G, et al. title An inosine 5 monophosphate dehydrogenase 2 single nucleotide polymorphism ... D, et al. title Effect of diabetes mellitus on mycophenolate sodium pharmacokinetics and inosine monophosphate ... author Sanquer S, Maison P, Tomkiewicz C, et al. title Expression of inosine monophosphate dehydrogenase ... frequency of human inosine 5 monophosphate dehydrogenase type II IMPDH2 genetic polymorphisms ... Bis sulfonamide isosters of mycophenolic adenine dinucleotide analogues inhibition of inosine ... more details
Image Wobble.svg thumb right 255px Wobble base pairs for inosine and guanine In molecular biology , a wobble base pair is a non Watson Crick base pairing between two nucleotides in RNA molecules. The four main wobble base pairs are guanine uracil , inosine uracil , inosine adenine , and inosine cytosine G U, I U, I A and I C . The thermodynamic stability of a wobble base pair is comparable to that of a Watson Crick base pair. Wobble base pairs are fundamental in RNA secondary structure and are critical for the proper translation of the genetic code . tRNA wobble In the genetic code , there are math 4 3 math 64 possible codons tri nucleotide sequences . For translation genetics translation , each of these codons requires a Transfer RNA tRNA molecule with a complementary Transfer RNA Anticodon anticodon . If each tRNA molecule paired with its complementary mRNA codon using canonical Watson Crick base pairing, then 64 types species of tRNA molecule would be required. In the standard genetic code, three of these 64 codons are stop codons, which terminate translation by binding to release factor s rather than tRNA molecules, so canonical pairing would require 61 species of tRNA. Since most organisms have fewer than 45 species of tRNA, ref http gtrnadb.ucsc.edu ref some tRNA species must pair with more than one codon. In 1966, Francis Crick proposed the Wobble hypothesis to account for this. He postulated that the Directionality molecular biology 5 base on the anticodon, which binds to the Directionality molecular biology 3 base on the mRNA , was not as spatially confined as the other two bases, and could, thus, have non standard base pairing. ref cite journal author Crick F title Codon&ndash anticodon pairing the wobble hypothesis journal J Mol Biol volume 19 issue 2 pages 548 55 year 1966 url http profiles.nlm.nih.gov SC B C B S scbcbs.pdf pmid 5969078 doi 10.1016 S0022 2836 66 80022 0 ref As an example, yeast tRNA sup Phenylalanine Phe sup has the anticodon 5 GmAA 3 and can ... more details
This is a list of antiviral drug s. NOTOC compacttoc A Abacavir anti HIV. NRTI drug. Ziagen ViiV Healthcare . In combination formulations Trizivir and Kivexa Epzicom Aciclovir anti HSV. Acyclovir Adefovir Amantadine Amprenavir Ampligen Arbidol Atazanavir Atripla fixed dose drug B Boceprevir C Cidofovir Combivir fixed dose drug D Darunavir Delavirdine Didanosine Docosanol E Edoxudine Efavirenz Emtricitabine Enfuvirtide Entecavir Entry inhibitors F Famciclovir Fixed dose combination antiretroviral Fomivirsen Fosamprenavir Foscarnet Fosfonet Fusion inhibitor G Ganciclovir I Ibacitabine Imunovir Idoxuridine Imiquimod Indinavir Inosine Integrase inhibitor Interferon type III Interferon type II Interferon type I Interferon L Lamivudine Lopinavir Loviride M Maraviroc Moroxydine Methisazone N Nelfinavir Nevirapine Nexavir Nucleoside analogues O Oseltamivir Tamiflu P Peginterferon alfa 2a Penciclovir Peramivir Pleconaril Podophyllotoxin Protease inhibitor pharmacology R Raltegravir Reverse transcriptase inhibitor Ribavirin Rimantadine Ritonavir Pyramidine S Saquinavir Stavudine Synergistic enhancer antiretroviral T Tea tree oil Tenofovir Tenofovir disoproxil Tipranavir Trifluridine Trizivir Tromantadine Truvada V Valaciclovir Valtrex Valganciclovir Vicriviroc Vidarabine Viramidine Z Zalcitabine Zanamivir Relenza Zidovudine Category Drug related lists Antiviral Category Antivirals ... more details
protein Name guanosine monophosphate reductase caption image width HGNCid 4376 Symbol GMPR AltSymbols EntrezGene 2766 OMIM 139265 RefSeq NM 006877 UniProt P36959 PDB ECnumber 1.7.1.7 Chromosome 6 Arm p Band 23 LocusSupplementaryData protein Name guanosine monophosphate reductase 2 caption image width HGNCid 4377 Symbol GMPR2 AltSymbols EntrezGene 51292 OMIM 610781 RefSeq NM 016576 UniProt Q9P2T1 PDB ECnumber Chromosome 14 Arm q Band 11.2 LocusSupplementaryData GMP reductase is an enzyme that converts Guanosine monophosphate GMP to Inosine monophosphate IMP . In melanocytic cells, GMP reductase gene expression may be regulated by Microphthalmia associated transcription factor MITF . ref name pmid19067971 cite journal author Hoek KS, Schlegel NC, Eichhoff OM, et al. title Novel MITF targets identified using a two step DNA microarray strategy journal Pigment Cell Melanoma Res. volume 21 issue 6 pages 665 76 year 2008 pmid 19067971 doi 10.1111 j.1755 148X.2008.00505.x issn ref See also Purine metabolism References reflist External links MeshName GMP reductase Nitrogenous donor oxidoreductases Nucleotide metabolism biochemistry stub it GMP reduttasi ja GMP ... more details
Orphan date February 2009 Rfam box acc RF00485 description Potassium channel RNA editing signal abbreviation K chan RES avg length 113.00 avg identity 61.00 type Cis reg se PMID 15361858 ss Published PMID 15361858 Moxon SJ release 10.0 The potassium channel RNA editing signal is an cis regulatory element RNA element found in human Kv1.1 and its homologues which directs the efficient modification of an adenosine to inosine by an adenosine deaminase acting on RNA ADAR . The ADAR modification causes an isoleucine valine recoding event which lies in the ion conducting pore of the potassium channel. It is thought that this editing event targets the process of fast inactivation and allows a more rapid recovery from inactivation at negative potentials. ref cite journal last Bhalla first T coauthors Rosenthal JJ, Holmgren M, Reenan R year 2004 title Control of human potassium channel inactivation by editing of a small mRNA hairpin journal Nat Struct Mol Biol volume 11 pages 950&ndash 956 pmid 15361858 doi 10.1038 nsmb825 issue 10 ref References reflist 1 External links Rfam id RF00485 name Potassium channel RNA editing signal Category Cis regulatory RNA elements molecular cell biology stub ... more details
Image 2 O methyl adenosine.GIF thumb 2 O methyl adenosine, a modified adenosine . 2 O methylation is a common nucleoside modification of RNA , where a methyl group is added to the nucleic acid nomenclature 2 hydroxyl group of the ribose moiety of a nucleoside. 2 O methylated nucleosides are found in the functionally essential regions of the ribosome and spliceosome . ref cite journal author Kiss T title Small nucleolar RNA guided post transcriptional modification of cellular RNAs journal EMBO J. volume 20 issue 14 pages 3617 22 year 2001 url http www.nature.com emboj journal v20 n14 full 7593858a.html doi 10.1093 emboj 20.14.3617 pmid 11447102 pmc 125535 ref Also, 2 O methylation of adenosine in an RNA prevents ADAR adenosine deaminase from editing it to an inosine . ref cite journal author Beal PA, Maydanovych O, Pokharel S title The chemistry and biology of RNA editing by adenosine deaminases journal Nucleic Acids Symposium Series date 2007 doi 10.1093 nass nrm042 pages 83 84 volume 51 issue 1 pmid 18029597 ref See also Small nucleolar RNA References references Category RNA molecular biology stub ... more details
The Purine Nucleotide Cycle is a metabolic pathway in which fumarate is generated from aspartate in order to increase the concentration of Krebs cycle intermediates. ref Salway, J. G., Metabolism at a glance 3rd edition , Blackwell Publishing Ltd., Oxford, 2004, pp. 56 57 ref The pathway was first described by John Lowenstein, who demonstrated its role in increasing the rate of oxidative phosphorylation in skeletal muscle . ref Voet, D., Voet, J. G., Biochemistry 3rd Edition , John Wiley & Sons, Inc., 2004, pp. 1094 1095 ref Outline The cycle is composed of three Enzyme enzyme catalysed reactions. The first stage is the deamination of the purine nucleotide Adenosine monophosphate AMP to form inosine monophosphate IMP , catalysed by the enzyme AMP deaminase AMP H sub 2 sub O IMP NH sub 4 sub sup sup The second stage is the formation of adenylosuccinate from IMP and the amino acid aspartate , which is coupled to the energetically favourable hydrolysis of Guanosine triphosphate GTP , and catalysed by the enzyme adenylosuccinate synthetase Aspartate IMP GTP Adenylosuccinate Guanosine diphosphate GDP Inorganic phosphate P sub i sub Finally, Adenylosuccinate is cleaved by the enzyme adenylosuccinate lyase to release fumarate and regenerate the starting material of AMP Adenylosuccinate AMP Fumarate References Reflist Category Purines Category Metabolic pathways Category Biochemistry ... more details
chembox verifiedrevid 415659445 ImageFile Hypoxanthin Hypoxanthine.svg ImageSize IUPACName 1 H purin 6 9 H one OtherNames Section1 Chembox Identifiers ChemSpiderID Ref chemspidercite correct chemspider ChemSpiderID 768 UNII Ref fdacite correct FDA UNII 2TN51YD919 KEGG Ref keggcite correct kegg KEGG C00262 InChI 1 C5H4N4O c10 5 3 4 7 1 6 3 8 2 9 5 h1 2H, H2,6,7,8,9,10 InChIKey FDGQSTZJBFJUBT UHFFFAOYAJ ChEMBL Ref ebicite correct EBI ChEMBL 1427 StdInChI Ref stdinchicite correct chemspider StdInChI 1S C5H4N4O c10 5 3 4 7 1 6 3 8 2 9 5 h1 2H, H2,6,7,8,9,10 StdInChIKey Ref stdinchicite correct chemspider StdInChIKey FDGQSTZJBFJUBT UHFFFAOYSA N CASNo 68 94 0 CASNo Ref cascite correct CAS PubChem 790 SMILES c1 nH c2c n1 nH cnc2 O MeSHName Hypoxanthine Section2 Chembox Properties Formula C sub 5 sub H sub 4 sub N sub 4 sub O MolarMass 136.112 Appearance Density MeltingPt BoilingPt Solubility Section3 Chembox Hazards MainHazards FlashPt Autoignition Hypoxanthine is a naturally occurring purine derivative. It is occasionally found as a constituent of nucleic acid s where it is present in the anticodon of tRNA in the form of its nucleoside inosine . It is also known as 6 Hydroxypurine. Hypoxanthine is a necessary additive in certain cell, bacteria, and parasite cultures as a substrate and nitrogen source. For example, it is commonly a required reagent in malaria parasite cultures, since Plasmodium falciparum requires a source of hypoxanthine for nucleic acid synthesis and energy metabolism. Reactions It is one of the products of the action of xanthine oxidase on xanthine . However, more frequently in purine degradation , hypoxanthine is formed from reduction of xanthine by xanthine oxidoreductase . Hypoxanthine guanine phosphoribosyltransferase converts hypoxanthine into Inosine monophosphate IMP in nucleotide salvage . Hypoxanthine is also a spontaneous deamination product of adenine . Because of its resemblance to guanine , the spontaneous deamination of adenine can lead to ... more details
A salvage pathway is a Metabolic pathway pathway in which nucleotide s purine and pyrimidine are synthesized from intermediates in the degradative pathway for nucleotides. Salvage pathways are used to recover bases and nucleosides that are formed during biodegradation degradation of RNA and DNA . This is important in some organs because some tissues cannot undergo de novo synthesis . The salvaged bases and nucleosides can then be converted back into nucleotides. Substrates The salvage pathway requires distinct substrates Pyrimidines Uridine phosphorylase adds ribose 1 phospate to the free base uracil, forming uridine monophosphate. Uridine kinase then phosphorylates this nucleoside into its diphosphate and triphosphate forms. Deoxythymidine phosphorylase adds deoxyribose 1 phosphate to thymine, forming deoxythymidine monophosphate. Thymidine kinase can then phosphorylate this compound to deoxythymidine diphosphate and triphosphate. Purines Phosphoribosyltransferases add activated ribose 5 phosphate called phosphoribosyl pyrophosphate or PRPP to bases, creating nucleotide monophosphates. There are two types of phosphoribosyltransferases adenosine phosphoribosyltransferase APRT and hypoxanthine guanine phosphoribosyltransferase HGPRT . Lesch Nyhan syndrome is associated with a deficiency of HGPRT. class wikitable Nucleoside Enzyme Nucleotide hypoxanthine hypoxanthine guanine phosphoribosyl transferase HGPRT Inosine monophosphate IMP guanine hypoxanthine guanine phosphoribosyl transferase HGPRT Guanosine monophosphate GMP adenine adenine phosphoribosyltransferase APRT Adenosine monophosphate AMP External links http www.chem.brandeis.edu pochapsky research.html Enzymes in the methionine salvage pathway structure and function at Brandeis University Category Genetics genetics stub Protein metabolism Nucleotide metabolism ca Salvament de nucle tids de Salvage Pathway ja zh ... more details
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