Photosystem I chlorophyll a/b-binding protein 3-1, chloroplastic (LHCA3) is a 273-residue protein from Arabidopsis thaliana. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: Q9SY97.
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The mean pLDDT of this model is 77.7 (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 | 26% |
| 70 to 90 | Confident: backbone generally right | 53% |
| 50 to 70 | Low: treat with caution | 2% |
| Below 50 | Very low: often disordered regions | 19% |
What pLDDT means and how to read it
The light-harvesting complex (LHC) functions as a light receptor, it captures and delivers excitation energy to photosystems with which it is closely associated, here photosystem I
The LHC complex consists of chlorophyll a-b binding proteins (PubMed:17476261, PubMed:19139095). Red-emitting heterodimer with LHCA2 (PubMed:17107674, PubMed:21083539). Interacts with LHCA5 (PubMed:15356385). Binds to carotenoids (PubMed:17326666)
Plastid, chloroplast thylakoid membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 8J6Z | EM | 2.79 Å | 3=1-273 |
| 8J7A | EM | 3.06 Å | 3=1-273 |
| 9GBI | EM | 3.13 Å | 3=40-273 |
| 8J7B | EM | 3.22 Å | 3=1-273 |
| 7WFD | EM | 3.25 Å | A3=1-273 |
| 7WFE | EM | 3.25 Å | B3=1-273 |
| 9GC2 | EM | 3.29 Å | 3=40-273 |
| 2O01 | X-ray | 3.4 Å | 3=95-259 |
| 7WG5 | EM | 3.89 Å | A3/B3=1-273 |
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