Treatment of complex III with dicyclohexyldicarbodiimide (DCCD) either before or after incorporation into liposomes resulted in a loss of electrogenic proton movements; however, only minimal decreases in cytochrome c reductase activity were noted in the liposomes containing DCCD-treated complex III. Thus, DCCD appears to act by "uncoupling" proton translocation from electron transport. A decreased sensitivity of the ubiquinol:cytochrome c reductase activity to antimycin was also noted in the DCCD-treated complex III. This loss of sensitivity to antimycin was reflected in a decreased binding of antimycin to the complex after DCCD treatment from 9.5 nmol/mg of protein in the control to 3.8 nmol/mg of protein in the DCCD-treated complex. DCCD also affected the red shift observed after antimycin addition to dithionite-reduced complex III resulting in a broad peak with no sharp maximum. Similarly, DCCD treatment of yeast mitochondria resulted in a complete loss in the red shift after antimycin addition to mitochondria previously reduced with succinate. No loss in enzymatic activity was observed in the DCCD-treated mitochondria. These results suggest that DCCD concomitant with the inhibition of proton ejection in the cytochrome b-c1 region of the respiratory chain causes modifications in the properties of cytochrome b which alter the binding of antimycin without significantly affecting the electron transfer activity of this cytochrome.
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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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