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      Soluble Tapasin Restores MHC Class I Expression and Function in the Tapasin-Negative Cell Line .220

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      Immunity
      Elsevier BV

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          Abstract

          Tapasin forms a bridge between TAP (transporters associated with antigen processing) and MHC class I molecules and plays a critical role in class I assembly. In its absence, TAP and class I do not associate, and class I cell surface expression is reduced. We now identify two independent functions for tapasin. Tapasin increases TAP levels and allows more peptide to be translocated to the endoplasmic reticulum. Furthermore, when expressed in the tapasin-negative .220 cell line, recombinant soluble tapasin retains its association with class I and restores class I cell surface expression and function, even though it no longer binds TAP or increases TAP levels. This finding suggests that the association of tapasin with class I is sufficient to facilitate loading and assembly of class I molecules.

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          Author and article information

          Journal
          Immunity
          Immunity
          Elsevier BV
          10747613
          February 1998
          February 1998
          : 8
          : 2
          : 221-231
          Article
          10.1016/S1074-7613(00)80474-4
          9492003
          33da1919-f93c-4390-bca6-6c0530d4e6ad
          © 1998

          https://www.elsevier.com/tdm/userlicense/1.0/

          https://www.elsevier.com/open-access/userlicense/1.0/

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