Streptokinase C (skc) is a 440-residue protein from Streptococcus dysgalactiae subsp. equisimilis. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P00779.
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The mean pLDDT of this model is 79.8 (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 | 51% |
| 70 to 90 | Confident: backbone generally right | 27% |
| 50 to 70 | Low: treat with caution | 6% |
| Below 50 | Very low: often disordered regions | 16% |
What pLDDT means and how to read it
This protein is not a protease, but it activates plasminogen by complexing with it. As a potential virulence factor, it is thought to prevent the formation of effective fibrin barriers around the site of infection, thereby contributing to the invasiveness of the cells
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 1L4D | X-ray | 2.3 Å | B=40-173 |
| 1QQR | X-ray | 2.3 Å | A/B/C/D=177-314 |
| 1L4Z | X-ray | 2.8 Å | B=27-173 |
| 1BML | X-ray | 2.9 Å | C/D=38-399 |
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