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Basic Science and Pathogenesis.

Aparna Unnikrishnan1, Dong Hee Chung1, Emily J Connelly1

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Summary
This summary is machine-generated.

Researchers developed antibody fragments (Fabs) to study the E3 ligase CHIP, revealing its structural states and how Fabs modulate its activity in tauopathies. This work offers new therapeutic targets for Alzheimer's disease and related disorders.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Neuroscience

Background:

  • E3 ligase CHIP interacts with tau, regulating its turnover and aggregation in Alzheimer's disease and tauopathies.
  • CHIP's role in tau clearance presents a therapeutic target, but its structural basis is unknown.
  • Developing antigen-binding antibody fragments (Fabs) can aid structural studies and explore therapeutic potential.

Purpose of the Study:

  • To structurally and functionally characterize E3 ligase CHIP using novel antigen-binding antibody fragments (Fabs).
  • To elucidate the structural basis of CHIP activity and its modulation for therapeutic intervention in tauopathies.

Main Methods:

  • Recombinant Fabs were developed and selected using bio-panning and BLI assays.
  • Cryo-EM was used to determine high-resolution structures of CHIP in complex with Fabs.
  • Functional assays (ubiquitination, E2-binding, tau fibrillation) screened Fab effects on CHIP activity.

Main Results:

  • Cryo-EM revealed three distinct CHIP conformational states (asymmetric, intermediate, symmetric dimers) in solution.
  • Fab binding modulated CHIP's E3 ligase activity and tau aggregation suppression.
  • Specific Fabs (2F1, H1, 2D2) were identified with distinct mechanisms of CHIP inhibition and tau interaction modulation.

Conclusions:

  • Fab screening elucidated potent CHIP functional modulation mechanisms.
  • CHIP-Fab structures provide insights into CHIP-driven tau clearance.
  • Identified unique therapeutic target sites on CHIP for potential drug development.