Light-harvesting protein B-800/850 alpha chain is a 53-residue protein from Rhodoblastus acidophilus. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P26789.
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The mean pLDDT of this model is 92.1 (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 | 79% |
| 70 to 90 | Confident: backbone generally right | 11% |
| 50 to 70 | Low: treat with caution | 9% |
| Below 50 | Very low: often disordered regions | 0% |
What pLDDT means and how to read it
Antenna complexes are light-harvesting systems, which transfer the excitation energy to the reaction centers
The core complex is formed by 9 alpha and 9 beta chains that bind bacteriochlorophyll and carotenoid molecules, and is disposed around the reaction center. The non-pigmented gamma chains may constitute additional components (By similarity)
Cell inner membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 1NKZ | X-ray | 2.0 Å | A/C/E=1-53 |
| 9EK8 | EM | 2.35 Å | A/C/E/G/I/K/M/O/Q=1-48 |
| 2FKW | X-ray | 2.45 Å | A/C/E/G/I/K/M/O/R=1-53 |
| 1KZU | X-ray | 2.5 Å | A/D/G=1-53 |
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