Cytochrome b (MT-CYB) is a 379-residue protein from Bos taurus. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P00157.
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The mean pLDDT of this model is 97.7 (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 | 100% |
| 70 to 90 | Confident: backbone generally right | 0% |
| 50 to 70 | Low: treat with caution | 0% |
| 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 |
|---|---|---|---|
| 1PP9 | X-ray | 2.1 Å | C/P=1-379 |
| 1PPJ | X-ray | 2.1 Å | C/P=1-379 |
| 2A06 | X-ray | 2.1 Å | C/P=1-379 |
| 9W2X | EM | 2.2 Å | C/N=2-379 |
| 2FYU | X-ray | 2.26 Å | C=1-379 |
| 1L0L | X-ray | 2.35 Å | C=1-379 |
| 1NTM | X-ray | 2.4 Å | C=1-379 |
| 9W2Y | EM | 2.4 Å | C/N=2-379 |
| 1L0N | X-ray | 2.6 Å | C=1-379 |
| 1NTK | X-ray | 2.6 Å | C=1-379 |
| 1NTZ | X-ray | 2.6 Å | C=1-379 |
| 1SQX | X-ray | 2.6 Å | C=1-379 |
| 5KLV | X-ray | 2.65 Å | C=1-379 |
| 1SQB | X-ray | 2.69 Å | C=1-379 |
| 1QCR | X-ray | 2.7 Å | C=2-379 |
| 1SQP | X-ray | 2.7 Å | C=1-379 |
| 6NHG | X-ray | 2.8 Å | C=1-379 |
| 1SQV | X-ray | 2.85 Å | C=1-379 |
| 7TZ6 | EM | 2.88 Å | C/P=1-379 |
| 7TAY | X-ray | 2.95 Å | C=1-379 |
Showing 20 of 46 experimental structures (best resolution first).
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