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Genetically engineered immunoglobulins reveal structural features controlling segmental flexibility.

W P Schneider1, T G Wensel, L Stryer

  • 1Department of Biological Sciences, Stanford University, CA 94305.

Proceedings of the National Academy of Sciences of the United States of America
|April 1, 1988
PubMed
Summary
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Structural flexibility in antibodies is controlled by the hinge and heavy chain constant region 1 (CH1), not CH2 or CH3 domains. Specific loops within CH1 are crucial for antibody segmental movement.

Area of Science:

  • Immunology
  • Structural Biology
  • Biophysics

Background:

  • Antibody structure dictates function, with segmental flexibility influencing antigen binding and immune response.
  • Understanding the molecular basis of antibody flexibility is key to designing therapeutic antibodies.

Purpose of the Study:

  • To identify the specific structural domains within immunoglobulins that control segmental flexibility.
  • To elucidate the role of the hinge and constant heavy chain domains in antibody movement.

Main Methods:

  • Nanosecond fluorescence polarization studies were performed on genetically engineered hybrid immunoglobulins.
  • Proteins were hybrids of mouse IgG1 (rigid) and IgG2a (flexible) isotypes with identical light chains and variable regions.
  • Fluorescence of a bound dansyl hapten was measured using time-resolved single-photon counting.

Related Experiment Videos

Main Results:

  • Segmental flexibility is governed by the heavy chain constant region 1 (CH1) and the hinge, not the CH2 or CH3 domains.
  • Proper matching between the hinge and CH1 domains is essential for facile Fab unit movement.
  • A specific loop (residues 131-139) within CH1 was identified as critical for controlling segmental flexibility.

Conclusions:

  • The CH1 domain and hinge region are the primary determinants of antibody segmental flexibility.
  • The interaction between the CH1 loop and the hinge is vital for antibody conformational dynamics.
  • These findings provide insights into the structure-function relationship of antibodies.