Cytochrome f (petA) is a 333-residue protein from Mastigocladus laminosus. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P83793.
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The mean pLDDT of this model is 90.2 (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 | 78% |
| 70 to 90 | Confident: backbone generally right | 13% |
| 50 to 70 | Low: treat with caution | 5% |
| Below 50 | Very low: often disordered regions | 4% |
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
Cellular thylakoid membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 4I7Z | X-ray | 2.8 Å | C=45-333 |
| 1VF5 | X-ray | 3.0 Å | C/P=45-333 |
| 2E74 | X-ray | 3.0 Å | C=45-333 |
| 4PV1 | X-ray | 3.0 Å | C=45-333 |
| 4H13 | X-ray | 3.07 Å | C=45-333 |
| 4H0L | X-ray | 3.25 Å | C=45-333 |
| 2E76 | X-ray | 3.41 Å | C=45-333 |
| 2E75 | X-ray | 3.55 Å | C=45-333 |
| 2D2C | X-ray | 3.8 Å | C/P=45-333 |
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