Abstract
The striking and unique structural feature of the T cell receptor (TCR) beta chain is the bulky solvent-exposed FG loop on the Cbeta domain, the size of almost half an immunoglobulin domain. The location and size of this loop suggested immediately that it could be a crucial structural link between the invariant CD3 subunits and antigen-recognizing alpha/beta chains during TCR signaling. However, functional analysis does not support the above notion, since transgene coding for TCR beta chain lacking the complete FG loop supports normal alpha/beta T cell development and function.
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