Saccharomyces cerevisiae RAD7 and RAD16 genes function together in the nucleotide excision repair of transcriptionally inactive DNA. The RAD7- and RAD16-encoded proteins exist as a tight complex named nucleotide excision repair factor 4 or NEF4. Previously, we showed that NEF4 binds UV-damaged DNA with high specificity and with a dependence upon ATP and that inclusion of NEF4 to the reconstituted nucleotide excision repair system consisting of purified NEF1, NEF2, NEF3, and replication protein A results in marked stimulation of damage-specific DNA incision. Here we show that NEF4 possesses an ATPase activity that is entirely dependent on a DNA cofactor and that double-stranded DNA is twice as effective as single-stranded DNA in activating ATP hydrolysis. Even though DNA binding is promoted by the nonhydrolyzable ATP analogue adenosine 5'-O-(thiotriphosphate) (ATPgammaS), damage binding is more proficient with ATP than with ATPgammaS. Interestingly, UV irradiation of double-stranded DNA results in a pronounced attenuation of the ATPase activity. Taken together, our results suggest a model in which ATP hydrolysis by NEF4 fuels the translocation of NEF4 on DNA in search of UV lesions and damage binding by NEF4 leads to a down-regulation of the ATPase activity. Damage-bound NEF4 could then serve as a nucleation point for the assembly of other repair components.
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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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