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© The Rockefeller University Press, 0022-1007/1997/8/393/ $5.00
The Journal of Experimental Medicine, Volume 186, Number 3, August 4, 1997 393-403


Articles

In Vitro Translation and Assembly of a Complete T Cell Receptor–CD3 Complex

Johannes B. Huppa and Hidde L. Ploegh

From the Center for Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

The T cell receptor for antigen (TCR) is a multisubunit complex that consists of at least seven polypeptides: the clonotypic, disulfide-linked {alpha}/β heterodimer that is noncovalently associated with the invariant polypeptides of the CD3 complex (CD3-{gamma}, -{delta}, -{varepsilon}) and {zeta}, a disulfide-linked homodimer. We achieved the complete assembly of the human TCR in an in vitro transcription/translation system supplemented with dog pancreas microsomes by simultaneous translation of the messenger RNAs encoding the TCR-{alpha}, -β and CD3-{gamma}, -{delta}, -{varepsilon}, and -{zeta} subunits. CD3-{varepsilon}, one of the subunits that initiates the assembly of the TCR in living cells, forms misfolded, disulfide-linked homooligomers when translated alone. However, co-translation of one of its first binding partners in the course of assembly, CD3-{gamma} or -{delta}, led to the expression of mainly monomeric and correctly folded {varepsilon} subunits, the only form we could detect as part of a properly assembled TCR complex. In the absence of these subunits, the ER-resident chaperone calnexin interacted with oligomeric, i.e. misfolded, structures of CD3-{varepsilon} in a glycan-independent manner. A glycan-dependent interaction between CD3-{varepsilon} and calnexin was mediated by CD3-{gamma} and concerned only monomeric CD3-{varepsilon} complexed with CD3-{gamma}, but was dispensable for proper folding of CD3-{varepsilon}. We suggest that in addition to its signaling function, CD3-{varepsilon} serves as a monitor for proper subunit assembly of the TCR.


Address correspondence to Hidde L. Ploegh, Center for Cancer Research, E17-325, Massachusetts Institute of Technology, 40 Ames St., Cambridge, MA 02139. Phone: 617-253-0519; FAX: 617-253-9891; E-mail: ploegh{at}mit.edu

Johannes B. Huppa was supported by fellowship of the Daimler-Benz-Stiftung (Ladenburg, Germany) and is currently a fellow of the Boehringer-Ingelheim-Fonds (Stuttgart, Germany). This work received support from the National Institutes of Health (1 PO1 AI 37833-01).

1 Abbreviations used in this paper: 7-O-dec, N-7-oxadecyl-dNM; DTT, dithiothreitol; EndoH, endoglycosidase H; ER, endoplasmic reticulum; GSSG, oxidized glutathion; HA, hemagglutinin; mRNA, messenger RNA; VSV–G protein, vesicular stomatitis virus G protein.


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