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Structural characterization of a soluble and partially folded class I major histocompatibility heavy chain/beta 2m

M Bouvier1, D C Wiley

  • 1Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

Nature Structural Biology
|May 20, 1998
PubMed

Insights

Class I MHC heavy chain folding requires assembly with beta 2 microglobulin. This study characterizes a soluble intermediate, revealing unstable peptide-binding domains akin to a molten globule state, crucial for MHC maturation.

Area of Science:

  • Immunology
  • Structural Biology
  • Biochemistry

Background:

  • Class I Major Histocompatibility (MHC) heavy chain (HC) assembly with beta 2 microglobulin (beta 2m) is critical for peptide binding and cell surface expression.
  • This process occurs in the endoplasmic reticulum (ER) and involves chaperones and other proteins.

Purpose of the Study:

  • To biochemically and structurally characterize a soluble Class I MHC heavy chain (B*0702)/beta 2m heterodimer.
  • To investigate the folding state and properties of this peptide-free intermediate.

Main Methods:

  • Biochemical characterization of a soluble heterodimer.
  • Structural analysis of the folding intermediate.

Main Results:

  • A soluble B*0702 heavy chain/beta 2 microglobulin heterodimer, apparently peptide-free, was characterized.
  • The peptide binding domains (alpha 1 and alpha 2) of this intermediate exhibit instability, resembling a molten globule state.
  • This partially folded state suggests stabilization by ER-associated chaperones and proteins.

Conclusions:

  • The characterized soluble heterodimer represents a folding intermediate of Class I MHC molecules.
  • Its molten globule-like properties provide insights into protein-assisted folding mechanisms in the ER.
  • This intermediate is a valuable tool for studying Class I MHC folding and peptide binding processes.

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