Cytochrome b (Mt-Cyb) is a 381-residue protein from Mus musculus. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P00158.
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The mean pLDDT of this model is 97.8 (very high overall). pLDDT is AlphaFold's per-residue confidence score from 0 to 100. In MolViewer, choose the B-factor color scheme to color the model by pLDDT, because AlphaFold stores it in the B-factor column.
| pLDDT band | Meaning | Share of residues |
|---|---|---|
| Above 90 | Very high: backbone and side chains are usually accurate | 99% |
| 70 to 90 | Confident: backbone generally right | 1% |
| 50 to 70 | Low: treat with caution | 1% |
| Below 50 | Very low: often disordered regions | 0% |
What pLDDT means and how to read it
Component of the ubiquinol-cytochrome c reductase complex (complex III or cytochrome b-c1 complex) that is part of the mitochondrial respiratory chain. The b-c1 complex mediates electron transfer from ubiquinol to cytochrome c. Contributes to the generation of a proton gradient across the mitochondrial membrane that is then used for ATP synthesis
The cytochrome bc1 complex contains 11 subunits: 3 respiratory subunits (MT-CYB, CYC1 and UQCRFS1), 2 core proteins (UQCRC1 and UQCRC2) and 6 low-molecular weight proteins (UQCRH/QCR6, UQCRB/QCR7, UQCRQ/QCR8, UQCR10/QCR9, UQCR11/QCR10 and a cleavage product of UQCRFS1). This cytochrome bc1 complex then forms a dimer
Mitochondrion inner membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 7O3H | EM | 2.6 Å | C/N=1-381 |
| 7O37 | EM | 3.2 Å | C/N=1-381 |
| 7O3C | EM | 3.3 Å | C/N=1-381 |
| 8PW6 | EM | 3.3 Å | C/N=1-381 |
| 8IAR | EM | 3.4 Å | AC/Ac=1-381 |
| 8IB7 | EM | 3.4 Å | AC/Ac=1-381 |
| 8PW7 | EM | 3.5 Å | C/N=1-381 |
| 7O3E | EM | 3.6 Å | C/N=1-381 |
| 8IBC | EM | 3.6 Å | AC/Ac=1-381 |
| 8PW5 | EM | 3.6 Å | C/N=1-381 |
| 8UCA | EM | 3.7 Å | 3C/3N=1-380 |
| 8IBG | EM | 3.8 Å | AC/Ac=1-381 |
| 8IC5 | EM | 4.1 Å | AC/Ac=1-381 |
| 8IAO | EM | 4.2 Å | AC/Ac=1-381 |
| 8IBD | EM | 4.2 Å | AC/Ac=1-381 |
| 8IB4 | EM | 4.3 Å | AC/Ac=1-381 |
| 8IB9 | EM | 4.3 Å | AC/Ac=1-381 |
| 8IC2 | EM | 6.3 Å | AC/Ac=1-381 |
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