Interleukin-21 receptor (IL21R) is a 538-residue protein from Homo sapiens. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: Q9HBE5.
Explore in 3D Color by confidence AlphaFold DB UniProt
The mean pLDDT of this model is 64.1 (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 | 33% |
| 70 to 90 | Confident: backbone generally right | 9% |
| 50 to 70 | Low: treat with caution | 16% |
| Below 50 | Very low: often disordered regions | 42% |
What pLDDT means and how to read it
This is a receptor for interleukin-21
Heterodimer with the common gamma subunit. Associates with JAK1
Membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 6PLH | X-ray | 1.6 Å | C=202-232 |
| 7KQ7 | X-ray | 2.2 Å | B=20-233 |
| 9E2T | X-ray | 2.28 Å | B/E/H/J=20-228 |
| 4NZD | X-ray | 2.75 Å | A/B/C=20-232 |
| 3TGX | X-ray | 2.8 Å | A/C/E/G/I/K/M/O=20-232 |
| 8ENT | X-ray | 2.83 Å | B/E/H/K=20-229 |
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.