The respiratory chain is located in the inner membrane of mitochondria and produces the major part of the ATP used by a cell. Cardiolipin (CL), a double charged phospholipid composing ~10-20% of the mitochondrial membrane, plays an important role in the function and supramolecular organization of the respiratory chain complexes. We present an extensive set of coarse-grain molecular dynamics (CGMD) simulations aiming at the determination of the preferential interfaces of CLs on the respiratory chain complex III (cytochrome bc(1), CIII). Six CL binding sites are identified, including the CL binding sites known from earlier structural studies and buried into protein cavities. The simulations revealed the importance of two subunits of CIII (G and K in bovine heart) for the structural integrity of these internal CL binding sites. In addition, new binding sites are found on the membrane-exposed protein surface. The reproducibility of these binding sites over two species (bovine heart and yeast mitochondria) points to an important role for the function of the respiratory chain. Interestingly the membrane-exposed CL binding sites are located on the matrix side of CIII in the inner membrane and thus may provide localized sources of proton ready for uptake by CIII. Furthermore, we found that CLs bound to those membrane-exposed sites bridge the proteins during their assembly into supercomplexes by sharing the binding sites.
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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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Evidence ID | Analyze ID | File | Description |
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