T cell receptor alpha variable 12-3 (TRAV12-3) is a 114-residue protein from Homo sapiens. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: A0A0B4J271.
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The mean pLDDT of this model is 92.6 (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 | 79% |
| 70 to 90 | Confident: backbone generally right | 18% |
| 50 to 70 | Low: treat with caution | 4% |
| Below 50 | Very low: often disordered regions | 0% |
What pLDDT means and how to read it
V region of the variable domain of T cell receptor (TR) alpha chain that participates in the antigen recognition (PubMed:24600447). Alpha-beta T cell receptors are antigen specific receptors which are essential to the immune response and are present on the cell surface of T lymphocytes. Recognize peptide-major histocompatibility (MH) (pMH) complexes that are displayed by antigen presenting cells (APC), a prerequisite for efficient T cell adaptive immunity against pathogens (PubMed:25493333). Binding of alpha-beta TR to pMH complex initiates TR-CD3 clustering on the cell surface and intracellular activation of LCK that phosphorylates the ITAM motifs of CD3G, CD3D, CD3E and CD247 enabling…
Alpha-beta TR is a heterodimer composed of an alpha and beta chain; disulfide-linked. The alpha-beta TR is associated with the transmembrane signaling CD3 coreceptor proteins to form the TR-CD3 (TcR or TCR). The assembly of alpha-beta TR heterodimers with CD3 occurs in the endoplasmic reticulum where a single alpha-beta TR heterodimer associates with one CD3D-CD3E heterodimer, one CD3G-CD3E…
Cell membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 5C0C | X-ray | 1.97 Å | D/I=24-113 |
| 5C0B | X-ray | 2.03 Å | D/I=25-113 |
| 5C07 | X-ray | 2.11 Å | D/I=24-113 |
| 5C08 | X-ray | 2.33 Å | D/I=25-113 |
| 5C0A | X-ray | 2.46 Å | D/I=25-113 |
| 5C09 | X-ray | 2.48 Å | D/I=25-113 |
| 7FJE | EM | 3.0 Å | m=2-114 |
| 5HYJ | X-ray | 3.06 Å | D/I=24-113 |
| 4WWK | X-ray | 3.1 Å | A=22-114 |
| 7FJF | EM | 3.1 Å | m=2-114 |
| 7FJD | EM | 3.2 Å | m=2-114 |
| 6JXR | EM | 3.7 Å | m=22-114 |
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