The cDNA encoding the human RNA lariat debranching enzyme (hDBR1) was identified and cloned by searching the Expressed Sequence Tag (EST) database and screening a HeLa cDNA library, based on predicted amino acid sequence homologies with the Saccharomyces cerevisiae, Schizosaccharomyces pombe and Caenorhabditis elegans debranching enzymes. The hDBR1 cDNA expressed in Escherichia coli showed debranching activity in vitro and was also shown to be functional in an interspecies specific complementation experiment. hDBR1 cDNA in a S. cerevisiae expression vector complemented the intron accumulation phenotype of a S. cerevisiae dbr1 null mutant. Integration of the cDNA for hDBR1 into the ura4 locus of S. pombe also complemented both the intron accumulation and slow growth phenotypes of a S. pombe dbr1 null mutant strain. Comparison of the amino acid sequence of hDBR1 with the other DBR protein sequences showed several conserved regions, with 40, 44 and 43% identity to the S. cerevisiae, S. pombe and C. elegans debranching enzymes, respectively.
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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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