A cDNA coding for UMP-CMP kinase from Dictyostelium discoideum was isolated from a lambda gt11 expression library and sequenced. The corresponding mRNA has a size of 0.7 kilobase and is down-regulated during early development of D. discoideum. Southern blotting demonstrated that the UMP-CMP kinase is encoded by a single gene. The deduced amino acid sequence of UMP-CMP kinase shows a high degree of homology with adenylate kinases from different sources with the highest degree of homology to cytosolic adenylate kinase from vertebrate muscle (43%). The enzyme expressed in Escherichia coli after cloning the cDNA into an ATG expression vector was purified and analyzed for its structural and kinetic properties. The UMP-CMP kinase uses preferentially ATP (Km,app = 25 microM) as phosphate donor and is specific for UMP (Km,app = 0.4 mM) and CMP (Km,app = 0.1 mM). The enzyme is strongly inhibited by the substrate analogue P1-(adenosine-5')-P5-(uridine-5')-pentaphosphate (Ki between 0.05 and 0.1 microM) and is inactivated by modification of free thiol groups with 5,5'-dithiobis(2-nitrobenzoic acid).
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| Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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| Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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