The Saccharomyces cerevisiae mRNA capping enzyme consists of two subunits: the RNA 5'-triphosphatase (Cet1) and the mRNA guanylyltransferase (Ceg1). Using computer homology searching, a S. cerevisiae gene was identified that encodes a protein resembling the C-terminal region of Cet1. Accordingly, we designated this gene CTL1 (capping enzyme RNAtriphosphatase-like 1). CTL1 is not essential for cell viability and no genetic or physical interactions with the capping enzyme genes were observed. The protein is found in both the nucleus and cytoplasm. Recombinant Ctl1 protein releases gamma-phosphate from the 5'-end of RNA to produce a diphosphate terminus. The enzyme is specific for polynucleotide RNA in the presence of magnesium, but becomes specific for nucleotide triphosphates in the presence of manganese. Ctl1 is the second member of the yeast RNA triphosphatase family, but is probably involved in an RNA processing event other than mRNA capping.
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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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