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BiP binding sequences in antibodies

G Knarr1, M J Gething, S Modrow

  • 1Institut für Biophysik & Physikalische Biochemie, Universität Regensburg, Germany.

The Journal of Biological Chemistry
|November 17, 1995
PubMed
Summary
This summary is machine-generated.

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Antibody folding involves BiP (Hsp70 chaperone) binding to hydrophobic sequences on immunoglobulin chains. These binding sites, identified computationally and experimentally, are crucial for interchain contacts during assembly.

Area of Science:

  • Molecular Biology
  • Protein Folding
  • Immunology

Background:

  • Immunoglobulin folding and assembly in the endoplasmic reticulum involves transient association with BiP, an Hsp70 molecular chaperone.
  • BiP is hypothesized to bind unfolded polypeptides via extended hydrophobic sequences (approx. 7 amino acids).

Purpose of the Study:

  • To identify potential BiP binding sites within immunoglobulin heavy and light chains using a predictive algorithm.
  • To experimentally validate predicted BiP binding sequences and map them structurally.

Main Methods:

  • Computational prediction of BiP binding sites using a specific algorithm.
  • Biochemical assays measuring BiP's ATPase activity stimulated by synthetic heptapeptides.
  • Structural mapping of identified BiP binding sequences onto antibody fragment (Fd) 3D structure.

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Main Results:

  • Few sequential heptapeptides in immunoglobulin chains were predicted as BiP binding sites.
  • Experimental analysis confirmed at least half of the tested heptapeptides as authentic BiP binding sequences.
  • Identified BiP binding sequences are distributed across VH and CH domains and often involve residues at interchain contact sites.

Conclusions:

  • BiP likely chaperones antibody folding and assembly by binding to specific hydrophobic regions on immunoglobulin chains.
  • These BiP-interacting regions are critical for subsequent heavy and light chain association.
  • The study provides insights into the molecular mechanisms of antibody biogenesis.