Signal recognition particle subunit SRP54, chloroplastic (FFC) is a 564-residue protein from Arabidopsis thaliana. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P37107.
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The mean pLDDT of this model is 71.7 (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 | 24% |
| 70 to 90 | Confident: backbone generally right | 44% |
| 50 to 70 | Low: treat with caution | 9% |
| Below 50 | Very low: often disordered regions | 23% |
What pLDDT means and how to read it
Involved in cotranslational and post-translational sorting of thylakoid proteins. Binds GTP specifically. Activates the GTPase activity of CPFTSY when bound together. Required for light-harvesting chlorophyll a/b-binding protein (LHCP) integration into thylakoids
Component of the cpSRP complex, composed of a FFC/cpSRP54 monomer and a CAO/cpSRP43 dimer. Interacts (via C-terminus) with CAO/cpSRP43 and with CPFTSY. Interacts with the third transmembrane domain of LHCP. Interacts with the PSBA/D1 nascent chain, but only when it is attached to the 70S ribosome and if it is shorter than 189 amino acid residues
Plastid, chloroplast stroma
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 5L3R | X-ray | 2.5 Å | A/C=77-371 |
| 3UI2 | X-ray | 3.18 Å | B=528-540 |
| 2HUG | NMR | B=530-543 |
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