Conformational heterogeneity of MHC class II induced upon binding to different peptides is a key regulator in antigen presentation and epitope selection

Scheherazade Sadegh-Nasseri, Sateesh Natarajan, Chih Ling Chou, Isamu Z. Hartman, Kedar Narayan, Aeryon Kim

Research output: Contribution to journalReview article

Abstract

T cells bearing αβ receptors recognize antigenic peptides bound to class I and class II glycoproteins encoded in the major histocompatibility complex (MHC). Cytotoxic and helper T cells respond respectively to peptide antigens derived from endogenous sources presented by MHC class I, and exogenous sources presented by MHC II, on antigen presenting cells. Differences in the MHC class I and class II structures and their maturation pathways have evolved to optimize antigen presentation to their respective T cells. A main focus of our laboratory is on efforts to understand molecular events in processing of antigen for presentation by MHC class II. The different stages of MHC class II-interactions with molecular chaperons involved in folding and traffic from the ER through the antigen-loading compartments, peptide exchange, and transport to the cell surface have been investigated. Through intense research on biophysical and biochemical properties of MHC class II molecules, we have learned that the conformational heterogeneity of MHC class II induced upon binding to different peptides is a key regulator in antigen presentation and epitope selection, and a determinant of the ability of MHC class II to participate in peptide association or dissociation and interaction with the peptide editor HLA-DM.

Original languageEnglish (US)
Pages (from-to)56-64
Number of pages9
JournalImmunologic Research
Volume47
Issue number1-3
DOIs
StatePublished - Jul 1 2010

Keywords

  • Conformational heterogeneity
  • H-bonds
  • Immunodominance
  • Kinetics
  • MHC class II
  • Peptide-receptive conformation

ASJC Scopus subject areas

  • Immunology

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