Antibody-like recognition of a γδ T cell receptor toward a foreign antigen
Bibliographic record
Abstract
The antigen recognition principles of B cells and αβ T cells have been well described compared to those of the γδ T cell. By way of their specificity conferring receptor (γδTCR), γδ T cells can directly bind proteinaceous antigens. A known γδ T cell and B cell model antigen is phycoerythrin (PE), a light harvesting protein from rhodophytes and cyanobacteria. Here we probed human γδTCR reactivity to PE, in which a Vδ1Vγ5 TCR bound directly to induce proximal signaling and cellular activation. We determined the cryoelectron microscopy (cryo-EM) structure of the γδTCR-phycoerythrin immune complex. We then determined the cryo-EM structures of an antibody fragment and an αβTCR bound to PE. This revealed convergent use of apical aromatic residues to mediate contacts with a common PE epitope. Comparative analyses of the γδTCR revealed multiple antibody-like characteristics, including an enrichment of apical aromatic residues. Our findings reveal further distinct facets of antigen recognition by the γδTCR.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".