Recent structural analyses support a model whereby Mms2 interacts with and orientates Ub to promote Ubc13-mediated Lys63 chain formation. However, residues of the hMms2-Ub interface have not been addressed. We found two hMms2 residues to be critical for binding and polyUb conjugation. Surprisingly, while each single mutation reduces the binding affinity, the double mutation causes significant reduction of Ub binding and abolishes polyUb chain formation. Furthermore, the corresponding yeast mms2 double mutant exhibited an additive phenotype that caused a complete loss of MMS2 function. Taken together, this study identifies key residues of the Mms2-Ub interface and provides direct experimental evidence that Mms2 physical association with Ub is correlated with its ability to promote Lys63-linked Ub chain assembly.
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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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