I-Ag7 is subject to post-translational chaperoning by CLIP

Cornelia H. Rinderknecht, Ning Lu, Oliver Crespo, Phi Truong, Tieying Hou, Nan Wang, Narendiran Rajasekaran, Elizabeth D. Mellins

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Several MHC class II alleles linked with autoimmune diseases form unusually low-stability complexes with class II-associated invariant chain peptides (CLIP), leading us to hypothesize that this is an important feature contributing to autoimmune pathogenesis. We recently demonstrated a novel post-endoplasmic reticulum (ER) chaperoning role of the CLIP peptides for the murine class II allele I-Ed. In the current study, we tested the generality of this CLIP chaperone function using a series of invariant chain (Ii) mutants designed to have varying CLIP affinity for I-Ag7. In cells expressing these Ii CLIP mutants, I-Ag7 abundance, turnover and antigen presentation are all subject to regulation by CLIP affinity, similar to I-Ed. However, I-Ag7 undergoes much greater quantitative changes than observed for I-Ed. In addition, we find that Ii with a CLIP region optimized for I-Ag7 binding may be preferentially assembled with I-Ag7 even in the presence of higher levels of wild-type Ii. This finding indicates that, although other regions of Ii interact with class II, CLIP binding to the groove is likely to be a dominant event in assembly of nascent class II molecules with Ii in the ER.

Original languageEnglish (US)
Pages (from-to)705-716
Number of pages12
JournalInternational Immunology
Issue number8
StatePublished - Jun 13 2010
Externally publishedYes


  • Antigen presentation/processing
  • Autoimmunity
  • CLIP
  • MHC

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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