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Science 21 January 1994:
Vol. 263. no. 5145, pp. 384 - 387
DOI: 10.1126/science.8278813

Articles

Science, Vol 263, Issue 5145, 384-387
Copyright © 1994 by American Association for the Advancement of Science


articles

Regulation of MHC class I transport by the molecular chaperone, calnexin (p88, IP90)

MR Jackson, MF Cohen-Doyle, PA Peterson, and DB Williams

Department of Immunology, Scripps Research Institute, La Jolla, CA 92037.

Assembled class I histocompatibility molecules, consisting of heavy chain, beta 2-microglobulin, and peptide ligand, are transported rapidly to the cell surface. In contrast, the intracellular transport of free heavy chains or peptide-deficient heavy chain-beta 2-microglobulin heterodimers is impaired. A 90-kilodalton membrane-bound chaperone of the endoplasmic reticulum (ER), termed calnexin, associates quantitatively with newly synthesized class I heavy chains, but the functions of calnexin in this interaction are unknown. Class I subunits were expressed alone or in combination with calnexin in Drosophila melanogaster cells. Calnexin retarded the intracellular transport of both peptide-deficient heavy chain-beta 2-microglobulin heterodimers and free heavy chains. Calnexin also impeded the rapid intracellular degradation of free heavy chains. The ability of calnexin to protect and retain class I assembly intermediates is likely to contribute to the efficient intracellular formation of class I-peptide complexes.


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