Enzymes
| UniProtKB help_outline | 43,259 proteins |
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- Name help_outline diphosphate Identifier CHEBI:33019 (Beilstein: 185088) help_outline Charge -3 Formula HO7P2 InChIKeyhelp_outline XPPKVPWEQAFLFU-UHFFFAOYSA-K SMILEShelp_outline OP([O-])(=O)OP([O-])([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 1,085 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline orotidine 5'-phosphate Identifier CHEBI:57538 (Beilstein: 10604117) help_outline Charge -3 Formula C10H10N2O11P InChIKeyhelp_outline KYOBSHFOBAOFBF-XVFCMESISA-K SMILEShelp_outline O[C@H]1[C@@H](O)[C@@H](O[C@@H]1COP([O-])([O-])=O)n1c(cc(=O)[nH]c1=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline 5-phospho-α-D-ribose 1-diphosphate Identifier CHEBI:58017 Charge -5 Formula C5H8O14P3 InChIKeyhelp_outline PQGCEDQWHSBAJP-TXICZTDVSA-I SMILEShelp_outline O[C@H]1[C@@H](O)[C@H](O[C@@H]1COP([O-])([O-])=O)OP([O-])(=O)OP([O-])([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 21 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline orotate Identifier CHEBI:30839 (Beilstein: 3651747; CAS: 73-97-2) help_outline Charge -1 Formula C5H3N2O4 InChIKeyhelp_outline PXQPEWDEAKTCGB-UHFFFAOYSA-M SMILEShelp_outline [O-]C(=O)c1cc(=O)[nH]c(=O)[nH]1 2D coordinates Mol file for the small molecule Search links Involved in 14 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:10380 | RHEA:10381 | RHEA:10382 | RHEA:10383 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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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.
McClard R.W., Black M.J., Livingstone L.R., Jones M.E.
UMP synthase, or multienzyme pyr-5,6 (orotate phosphoribosyltransferase:orotidine monophosphate decarboxylase), has been purified from Ehrlich ascites carcinoma to apparent homogeneity. The purification was achieved by the use of 5-[2-[N-(2-aminoethyl)carbamyl]ethyl]-6-azauridine 5'-monophosphate- ... >> More
UMP synthase, or multienzyme pyr-5,6 (orotate phosphoribosyltransferase:orotidine monophosphate decarboxylase), has been purified from Ehrlich ascites carcinoma to apparent homogeneity. The purification was achieved by the use of 5-[2-[N-(2-aminoethyl)carbamyl]ethyl]-6-azauridine 5'-monophosphate-agarose and phosphocellulose affinity columns linked in tandem by a flow dialysis system. The purified protein has amolecular weight of approximately 51500 as judged by polyacrylamide gel electrophoresis in sodium dodecyl sulfate. Both enzyme activities cosediment with an S20,w value of 3.7 S, which corresponds to a molecular weight of about 50000. Two-dimensional electrophoresis of UMP synthase shows that the protein exists as two isomeric forms with isoelectric points of 5.85 (major form) and 5.65 (minor form). Both forms have the same molecular weight of 51500 and contain both active centers. These results clearly show that the last two enzyme activities of de novo UMP biosynthesis occur on a single polypeptide chain of approximately 51500 daltons and that this polypeptide exists in at least two isomeric forms. << Less
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Functional analysis of pyrimidine biosynthesis enzymes using the anticancer drug 5-fluorouracil in Caenorhabditis elegans.
Kim S., Park D.H., Kim T.H., Hwang M., Shim J.
Pyrimidine biosynthesis enzymes function in many cellular processes and are closely associated with pyrimidine antagonists used in cancer chemotherapy. These enzymes are well characterized from bacteria to mammals, but not in a simple metazoan. To study the pyrimidine biosynthesis pathway in Caeno ... >> More
Pyrimidine biosynthesis enzymes function in many cellular processes and are closely associated with pyrimidine antagonists used in cancer chemotherapy. These enzymes are well characterized from bacteria to mammals, but not in a simple metazoan. To study the pyrimidine biosynthesis pathway in Caenorhabditis elegans, we screened for mutants exhibiting resistance to the anticancer drug 5-fluorouracil (5-FU). In several strains, mutations were identified in ZK783.2, the worm homolog of human uridine phosphorylase (UP). UP is a member of the pyrimidine biosynthesis family of enzymes and is a key regulator of uridine homeostasis. C. elegans UP homologous protein (UPP-1) exhibited both uridine and thymidine phosphorylase activity in vitro. Knockdown of other pyrimidine biosynthesis enzyme homologs, such as uridine monophosphate kinase and uridine monophosphate synthetase, also resulted in 5-FU resistance. Uridine monophosphate kinase and uridine monophosphate synthetase proteins are redundant, and show different, tissue-specific expression patterns in C. elegans. Whereas pyrimidine biosynthesis pathways are highly conserved between worms and humans, no human thymidine phosphorylase homolog has been identified in C. elegans. UPP-1 functions as a key regulator of the pyrimidine salvage pathway in C. elegans, as mutation of upp-1 results in strong 5-FU resistance. << Less
FEBS J. 276:4715-4726(2009) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.
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Enzymatic synthesis of pyrimidine nucleotides; orotidine-5'-phosphate and uridine-5'-phosphate.
LIEBERMAN I., KORNBERG A., SIMMS E.S.
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Orotate phosphoribosyltransferase: orotidylate decarboxylase (Ehrlich ascites cell).
Jones M.E., Kavipurapu P.R., Traut T.W.