Cytochrome b6 (petB) is a 215-residue protein from Spinacia oleracea. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P00165.
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The mean pLDDT of this model is 97.0 (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 cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions
The 4 large subunits of the cytochrome b6-f complex are cytochrome b6, subunit IV (17 kDa polypeptide, PetD), cytochrome f and the Rieske protein, while the 4 small subunits are PetG, PetL, PetM and PetN. The complex functions as a dimer
Plastid, chloroplast thylakoid membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 9ES7 | EM | 1.94 Å | A/I=1-215 |
| 7ZYV | EM | 2.13 Å | A/I=1-215 |
| 9ES8 | EM | 2.24 Å | A/I=1-215 |
| 9ES9 | EM | 2.33 Å | A/I=1-215 |
| 7QRM | EM | 2.7 Å | A/I=1-215 |
| 9TGG | EM | 3.18 Å | A/I=1-215 |
| 6RQF | EM | 3.58 Å | A/I=1-215 |
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