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. 1992 Sep;11(9):3245–3254. doi: 10.1002/j.1460-2075.1992.tb05402.x

Transmembrane helical interactions: zeta chain dimerization and functional association with the T cell antigen receptor.

T Rutledge 1, P Cosson 1, N Manolios 1, J S Bonifacino 1, R D Klausner 1
PMCID: PMC556858  PMID: 1505516

Abstract

Members of the zeta family of receptor subunits (zeta, eta and gamma) are structurally related proteins found as components of the T cell antigen receptor (TCR) and certain Fc receptors. These proteins share the ability to form disulfide-linked dimers with themselves and with other members of the family. Comparison of the amino acid sequences of zeta and gamma reveals a significant degree of homology, which is highest within their membrane-spanning domains. Analysis of their transmembrane sequences on a helical wheel projection suggests that all of the identical amino acids are clustered on one face of a potential alpha-helix. This face contains the only cysteine residue within zeta, suggesting that this conserved region may function to mediate dimerization. Indeed, replacing the transmembrane domain of the Tac antigen (alpha chain of the interleukin-2 receptor) by that of the zeta chain resulted in the formation of disulfide-linked dimers of Tac. The conserved aspartic acid residue found in the zeta and gamma transmembrane sequences was found to play a role in disulfide linkage. Replacing the aspartic acid with a lysine but not with an alanine or valine residue allowed formation of disulfide-linked dimers. The ability of the aspartic acid residue to support dimerization was dependent upon its position within the helix. Thus, these observations indicate that residues within the zeta transmembrane domain play a critical role in the formation of disulfide-linked dimers. Expression of zeta mutants in zeta-deficient T cells revealed that the zeta transmembrane domain is also responsible for reconstituting transport of functional TCR complexes to the cell surface and differentiated the requirements for disulfide-linked dimerization per se from assembly of the TCR complex.

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Selected References

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