Signal recognition particle 9 kDa protein (SRP9) is a 86-residue protein from Homo sapiens. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P49458.
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The mean pLDDT of this model is 90.3 (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 | 85% |
| 70 to 90 | Confident: backbone generally right | 2% |
| 50 to 70 | Low: treat with caution | 4% |
| Below 50 | Very low: often disordered regions | 9% |
What pLDDT means and how to read it
Component of the signal recognition particle (SRP) complex, a ribonucleoprotein complex that mediates the cotranslational targeting of secretory and membrane proteins to the endoplasmic reticulum (ER) (By similarity). SRP9 together with SRP14 and the Alu portion of the SRP RNA, constitutes the elongation arrest domain of SRP (PubMed:11089964). The complex of SRP9 and SRP14 is required for SRP RNA binding (By similarity)
Heterodimer with SRP14; binds RNA as heterodimer (By similarity). Component of a signal recognition particle complex that consists of a 7SL RNA molecule of 300 nucleotides and six protein subunits: SRP72, SRP68, SRP54, SRP19, SRP14 and SRP9 (PubMed:11089964)
Cytoplasm
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 5AOX | X-ray | 2.04 Å | A/D=2-86 |
| 1E8O | X-ray | 3.2 Å | A/C=2-86 |
| 7NFX | EM | 3.2 Å | w=1-86 |
| 4UYK | X-ray | 3.22 Å | A=1-85 |
| 4UYJ | X-ray | 3.35 Å | A/C=1-85 |
| 1E8S | X-ray | 4.0 Å | A=2-86 |
| 1RY1 | EM | 12.0 Å | C=2-86 |
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