Reaction center protein H chain (puhA) is a 260-residue protein from Cereibacter sphaeroides (strain ATCC 17023 / DSM 158 / JCM 6121 / CCUG 31486 / LMG 2827 / NBRC 12203 / NCIMB 8253 / ATH 2.4.1.). This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: Q3J170.
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The mean pLDDT of this model is 93.9 (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 | 85% |
| 70 to 90 | Confident: backbone generally right | 13% |
| 50 to 70 | Low: treat with caution | 2% |
| Below 50 | Very low: often disordered regions | 0% |
What pLDDT means and how to read it
The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis
Heterotrimer composed of subunits L, M, and H
Cellular chromatophore membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 7P2C | X-ray | 2.04 Å | H=9-250 |
| 4IN5 | X-ray | 2.2 Å | H=1-260 |
| 5LRI | X-ray | 2.4 Å | H=1-260 |
| 7PIL | EM | 2.5 Å | H=1-246 |
| 2WX5 | X-ray | 2.63 Å | H=1-260 |
| 4IN6 | X-ray | 2.7 Å | H=1-260 |
| 7VOR | EM | 2.74 Å | H/h=1-260 |
| 7VNY | EM | 2.79 Å | H=1-260 |
| 4N7L | X-ray | 2.85 Å | H=11-251 |
| 7VNM | EM | 2.86 Å | H=1-260 |
| 7VOT | EM | 2.9 Å | H/h=1-260 |
| 7F0L | EM | 2.94 Å | H=1-260 |
| 7VA9 | EM | 3.08 Å | H/h=1-260 |
| 7VB9 | EM | 3.45 Å | H/h=1-260 |
| 7VOY | EM | 4.2 Å | H=1-260 |
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