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Capturing transient antibody conformations with DNA origami epitopes.

Ping Zhang1, Xiaoguo Liu2, Pi Liu3,4

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Researchers developed DNA origami epitopes to visualize antibody-antigen interactions in real-time. This method reveals how antibody binding strength (avidity) depends on epitope spacing, offering insights into immune responses.

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Area of Science:

  • Immunology
  • Nanotechnology
  • Structural Biology

Background:

  • Understanding single-molecule antibody-antigen interactions is crucial for immunology.
  • Current structural methods lack temporal resolution for transient complexes.
  • Functional antibody-antigen complexes are key in physiological and pathological processes.

Purpose of the Study:

  • To develop a method for imaging transient antibody-antigen complexes at room temperature.
  • To investigate the relationship between epitope spacing and antibody avidity at the single-molecule level.
  • To provide structural and dynamic insights into antibody-antigen interactions.

Main Methods:

  • Development of a triangular DNA origami framework with site-specifically anchored artificial epitopes (DNA origami epitopes, DOEs).
  • Programmed spatial distribution of epitope spikes on the DNA origami framework.
  • Direct imaging of functional complexes using atomic force microscopy (AFM), including high-speed AFM.

Main Results:

  • Established critical dependence of immunoglobulin G (IgG) avidity on lateral epitope distance (3-20 nm) at the single-molecule level.
  • Demonstrated real-time imaging of transient IgG conformations and avidity changes.
  • Provided structural and dynamic evidence for IgG avidity transitions from monovalent to bivalent in a single event.

Conclusions:

  • The DNA origami epitope (DOE) platform enables visualization of single-molecule antibody-antigen interactions with temporal resolution.
  • Single-molecule avidity is critically dependent on epitope spacing, providing new insights into binding dynamics.
  • This technique has potential applications in virus neutralization, diagnostics, and cancer immunotherapy research.