Photosystem I reaction center subunit II, chloroplastic (psaD) is a 212-residue protein from Spinacia oleracea. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P12353.
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The mean pLDDT of this model is 77.3 (confident 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 | 56% |
| 70 to 90 | Confident: backbone generally right | 11% |
| 50 to 70 | Low: treat with caution | 12% |
| Below 50 | Very low: often disordered regions | 21% |
What pLDDT means and how to read it
PsaD can form complexes with ferredoxin and ferredoxin-oxidoreductase in photosystem I (PS I) reaction center. PSAD may encode the ferredoxin-docking protein
Plastid, chloroplast thylakoid membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 9GRX | EM | 3.19 Å | d=70-212 |
| 2WSC | X-ray | 3.3 Å | D=1-212 |
| 2O01 | X-ray | 3.4 Å | D=75-212 |
| 2WSF | X-ray | 3.48 Å | D=1-212 |
| 2WSE | X-ray | 3.49 Å | D=1-212 |
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