The resolution of Holliday junctions is a critical stage in recombination. We describe the identification and initial biochemical characterisation of a new Holliday junction resolvase from Schizosaccharomyces pombe. Resolvase activity was initially detected in partially purified cell-free extracts of S. pombe. Resolution of X-junction DNA occurred by the introduction of symmetrical cuts in strands of the same polarity. All cuts occurred 3' of thymine nucleotides with a possible preference for cleavage one nucleotide 3' from the point of strand crossover. During the course of these studies, a potential S. pombe homologue of the Saccharomyces cerevisiae Cruciform Cutting Endonuclease I was identified in the database (SpCCE1). The gene was cloned by PCR, overexpressed in Escherichia coli and its product purified as a His-tagged fusion protein. Purified SpCCE1 binds to X-junctions in a structure-specific manner and resolves them to nicked linear duplex products that are repairable by DNA ligase. SpCCE1 cuts X-junctions in precisely the same way as the resolvase activity from partially purified extracts of S. pombe, indicating that they are probably the same. Finally, we show that SpCCE1 can function as a Holliday junction resolvase in vivo by its ability to complement a resolvase-deficient strain of E. coli.
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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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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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