Iron stress-induced chlorophyll-binding protein (isiA) is a 358-residue protein from Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1). This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: Q8DK20.
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The mean pLDDT of this model is 93.3 (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 | 86% |
| 70 to 90 | Confident: backbone generally right | 10% |
| 50 to 70 | Low: treat with caution | 2% |
| Below 50 | Very low: often disordered regions | 3% |
What pLDDT means and how to read it
Functions as an antenna for photosystem I (PSI) under iron-limiting conditions, when phycobilisomes disappear. In the (PSI)3(Isi3)18 complex most of the harvested energy is probably used by PSI; in other PSI-containing supercomplexes a large part of the energy will probably not be used for light harvesting, but rather is dissipated to protect the organism from light damage
Under iron-starvation forms a complex with PSI trimers, where the trimer is surrounded by a ring composed of 18 IsiA subunits
Cellular thylakoid membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 9LZJ | EM | 3.4 Å | S/T/U/V/W/X/Y/Z/a/a1/a2/a3/a4/a5/a6/b/b1/b2/b3/b4/b5/b6/c/c1/c2/c3/c4/c5/c6/d=1-358 |
| 9LZK | EM | 3.5 Å | 1/2/3/4/5/6/a/b/c/d/e/f/g=1-358 |
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