Protein transport protein SEC31 (SEC31) is a 1273-residue protein from Saccharomyces cerevisiae (strain ATCC 204508 / S288c). This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P38968.
Explore in 3D Color by confidence AlphaFold DB UniProt
The mean pLDDT of this model is 69.7 (low 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 | 37% |
| 70 to 90 | Confident: backbone generally right | 23% |
| 50 to 70 | Low: treat with caution | 6% |
| Below 50 | Very low: often disordered regions | 34% |
What pLDDT means and how to read it
Component of the coat protein complex II (COPII) which promotes the formation of transport vesicles from the endoplasmic reticulum (ER). The coat has two main functions, the physical deformation of the endoplasmic reticulum membrane into vesicles and the selection of cargo molecules
The COPII coat is composed of at least 5 proteins: the SEC23/24 complex, the SEC13/31 complex, and the protein SAR1. SEC13 and SEC31 make a 2:2 tetramer that forms the edge element of the COPII outer coat. The tetramer self-assembles in multiple copies to form the complete polyhedral cage. Interacts (via WD 8) with SEC13. Interacts with EMP24, ERV25, SEC16 and SHR3
Cytoplasmic vesicle, COPII-coated vesicle membrane, Endoplasmic reticulum membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 2PM7 | X-ray | 2.35 Å | A/C=370-763 |
| 2PM6 | X-ray | 2.45 Å | A/C=370-763 |
| 2QTV | X-ray | 2.5 Å | D=899-947 |
| 3MZL | X-ray | 2.8 Å | B/D/F/H=370-746 |
| 2PM9 | X-ray | 3.3 Å | A=1-411 |
| 4BZJ | EM | 40.0 Å | A/C=1-1273 |
| 4BZK | EM | 40.0 Å | A/C=1-1273 |
| 6ZG5 | EM | 40.0 Å | A/C=1-1273 |
| 6ZG6 | EM | 40.0 Å | A/C/E/G=1-1273 |
| 6ZL0 | EM | 40.0 Å | A/C=1-1273 |
MolViewer loads the AlphaFold model straight from AlphaFold DB into your browser. Show it as a cartoon, color by pLDDT, measure distances and angles, and load a PDB structure next to it to compare.