Atp11p is a soluble protein of mitochondria that binds unassembled beta subunits of the F(1)-ATPase and prevents them from aggregating in the matrix. In this report, we show that Atp11p protects the insulin B chain from aggregating in vitro and therefore acts as a molecular chaperone. The chaperone action of Atp11p is mediated by hydrophobic interactions. An accessible hydrophobic surface in Atp11p was identified with the environment-sensitive fluorescent probe 1,1'-bis(4-anilino-5-napththalenesulfonic acid (bis-ANS). The spectral changes of bis-ANS in the presence of Atp11p indicate that the probe binds to a nonpolar region of the protein. Furthermore, the dye quenches the fluorescence of Atp11p tryptophan residues in a concentration-dependent manner. Although up to three molecules of bis-ANS can bind cooperatively to Atp11p, the binding of only one dye molecule is sufficient to virtually eliminate the chaperone activity of the protein.
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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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