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. 1988 Sep;85(18):6929–6933. doi: 10.1073/pnas.85.18.6929

Subunit interactions within the T-cell antigen receptor: clues from the study of partial complexes.

J S Bonifacino 1, C Chen 1, J Lippincott-Schwartz 1, J D Ashwell 1, R D Klausner 1
PMCID: PMC282092  PMID: 3261872

Abstract

The T-cell antigen receptor is a multisubunit complex composed of seven transmembrane chains (alpha beta gamma delta epsilon zeta 2). Subunit interactions within this complex were defined by analyzing the subunit composition of partial complexes. These partial complexes were observed in mutant and tumor T cells that fail to synthesize one or more of the receptor chains or in fibroblasts transfected with genes encoding T-cell antigen receptor chains. In addition, partial complexes were generated by immunoprecipitation with antibodies that cause selective dissociation of T-cell antigen receptor chains. The alpha and beta chains were found to form a disulfide-linked dimer in the absence of any of the other chains. The gamma, delta, and epsilon chains were also efficiently associated in the absence of a complete heterodimer. Complexes composed only of delta epsilon or gamma epsilon could be observed. Both these dimers, as well as the gamma delta epsilon trimer, could form stable complexes with alpha beta, even in the absence of zeta 2. The zeta 2 dimer could bind directly to alpha beta. In the absence of a complete clonotypic heterodimer, zeta 2 was not stably associated with gamma delta epsilon. These observations suggest a model in which alpha beta interacts directly with the gamma delta epsilon trimer and zeta 2, with less-direct interaction between the latter two.

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