Signal recognition particle 54 kDa protein (srp54) is a 447-residue protein from Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2). This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: Q97ZE7.
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The mean pLDDT of this model is 86.9 (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 | 56% |
| 70 to 90 | Confident: backbone generally right | 34% |
| 50 to 70 | Low: treat with caution | 9% |
| Below 50 | Very low: often disordered regions | 2% |
What pLDDT means and how to read it
Involved in targeting and insertion of nascent membrane proteins into the cytoplasmic membrane. Binds to the hydrophobic signal sequence of the ribosome-nascent chain (RNC) as it emerges from the ribosomes. The SRP-RNC complex is then targeted to the cytoplasmic membrane where it interacts with the SRP receptor FtsY
Part of the signal recognition particle protein translocation system, which is composed of SRP and FtsY. Archaeal SRP consists of a 7S RNA molecule of 300 nucleotides and two protein subunits: SRP54 and SRP19
Cytoplasm
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 5L3S | X-ray | 1.9 Å | A/C/E/G=1-292 |
| 5L3V | X-ray | 2.3 Å | A/B=1-293 |
| 3KL4 | X-ray | 3.5 Å | A=2-432 |
| 1QZX | X-ray | 4.0 Å | A/B=1-432 |
| 1QZW | X-ray | 4.1 Å | A/C/E/G=1-432 |
| 3ZN8 | EM | 12.0 Å | M=308-431 |
| 2IY3 | EM | 16.0 Å | A=297-432 |
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