T cell receptors are structures capable of initiating signaling in the absence of large conformational rearrangements.
Fernandes, R.A., Shore, D.A., Vuong, M.T., Yu, C., Zhu, X., Pereira-Lopes, S., Brouwer, H., Fennelly, J.A., Jessup, C.M., Evans, E.J., Wilson, I.A., Davis, S.J.(2012) J Biol Chem 287: 13324-13335
- PubMed: 22262845 
- DOI: 10.1074/jbc.M111.332783
- Primary Citation of Related Structures:  
3R06, 3R08 - PubMed Abstract: 
Native and non-native ligands of the T cell receptor (TCR), including antibodies, have been proposed to induce signaling in T cells via intra- or intersubunit conformational rearrangements within the extracellular regions of TCR complexes. We have investigated whether any signatures can be found for such postulated structural changes during TCR triggering induced by antibodies, using crystallographic and mutagenesis-based approaches ...