Immunoglobulin G-binding protein G (spg) is a 593-residue protein from Streptococcus sp. group G. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P19909.
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The mean pLDDT of this model is 72.8 (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 | 38% |
| 70 to 90 | Confident: backbone generally right | 26% |
| 50 to 70 | Low: treat with caution | 11% |
| Below 50 | Very low: often disordered regions | 25% |
What pLDDT means and how to read it
Secreted, cell wall
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 3FIL | X-ray | 0.88 Å | A/B=303-357 |
| 2QMT | X-ray | 1.05 Å | A=303-357 |
| 9I2I | X-ray | 1.08 Å | A/B=303-357 |
| 6CHE | X-ray | 1.1 Å | A=304-357 |
| 6CPZ | X-ray | 1.12 Å | A/B=304-357 |
| 2GI9 | X-ray | 1.14 Å | A=303-357 |
| 6C9O | X-ray | 1.2 Å | A/B=304-357 |
| 6CTE | X-ray | 1.2 Å | A/B=304-357 |
| 6OC7 | X-ray | 1.3 Å | C=438-497 |
| 6NLA | X-ray | 1.34 Å | A=303-357 |
| 2ON8 | X-ray | 1.35 Å | A=373-427 |
| 6NL6 | X-ray | 1.4 Å | A/B/C/D=303-357 |
| 6NL7 | X-ray | 1.4 Å | A/B/C/D=303-357 |
| 6NL8 | X-ray | 1.5 Å | A=303-357 |
| 8WCJ | X-ray | 1.55 Å | A=444-497 |
| 5BMH | X-ray | 1.6 Å | A=304-357 |
| 9T8Z | X-ray | 1.69 Å | A/B=303-357 |
| 2ONQ | X-ray | 1.7 Å | A=373-427 |
| 6NL9 | X-ray | 1.7 Å | A/B/C/D=303-357 |
| 4OZB | X-ray | 1.8 Å | A/B=302-357 |
Showing 20 of 86 experimental structures (best resolution first).
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