Cytochrome b (COB) is a 385-residue protein from Saccharomyces cerevisiae (strain ATCC 204508 / S288c). This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P00163.
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The mean pLDDT of this model is 98.1 (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 | 98% |
| 70 to 90 | Confident: backbone generally right | 2% |
| 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 oxidoreductase, a multisubunit transmembrane complex that is part of the mitochondrial electron transport chain which drives oxidative phosphorylation. The respiratory chain contains 3 multisubunit complexes succinate dehydrogenase (complex II, CII), ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII) and cytochrome c oxidase (complex IV, CIV), that cooperate to transfer electrons derived from NADH and succinate to molecular oxygen, creating an electrochemical gradient over the inner membrane that drives transmembrane transport and the ATP synthase. The cytochrome b-c1 complex catalyzes electron transfer from ubiquinol…
Component of the ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII), a multisubunit enzyme composed of 10 subunits. The complex is composed of 3 respiratory subunits cytochrome b (COB), cytochrome c1 (CYT1) and Rieske protein (RIP1), 2 core protein subunits COR1 and QCR2, and 5 low-molecular weight protein subunits QCR6, QCR7, QCR8, QCR9 and QCR10…
Mitochondrion inner membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 3CX5 | X-ray | 1.9 Å | C/N=1-385 |
| 1EZV | X-ray | 2.3 Å | C=1-385 |
| 1KB9 | X-ray | 2.3 Å | C=1-385 |
| 2IBZ | X-ray | 2.3 Å | C=1-385 |
| 8YIO | EM | 2.35 Å | C/N=1-385 |
| 9ETZ | EM | 2.4 Å | C/N=1-385 |
| 8YHQ | EM | 2.42 Å | C/L=1-385 |
| 1P84 | X-ray | 2.5 Å | C=1-385 |
| 3CXH | X-ray | 2.5 Å | C/N=1-385 |
| 8ZJC | EM | 2.5 Å | C/N=1-385 |
| 8ZMT | EM | 2.52 Å | C/N=1-385 |
| 9BPB | EM | 2.57 Å | C/M=1-385 |
| 8YIL | EM | 2.58 Å | C/N=1-385 |
| 8YIN | EM | 2.74 Å | C/N=1-385 |
| 6T0B | EM | 2.8 Å | C/N=1-385 |
| 1KYO | X-ray | 2.97 Å | C/N=1-385 |
| 4PD4 | X-ray | 3.04 Å | C=1-385 |
| 6YMX | EM | 3.17 Å | C/N=1-385 |
| 8E7S | EM | 3.2 Å | J/j=1-385 |
| 6GIQ | EM | 3.23 Å | C/N=1-385 |
Showing 20 of 23 experimental structures (best resolution first).
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