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Author Spotlight: Evaluating Biophysical Assays for Characterizing PROTACS Ternary Complexes
Published on: January 12, 2024
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Construction of PROTAC-Mediated Ternary Complex Structure Distribution Profiles Using Extensive Conformational
Genki Kudo1, Takumi Hirao2,3, Ryuhei Harada4
1Physics Department, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan.
Journal of Chemical Information and Modeling
|June 23, 2025
Summary
Proteolysis-targeting chimeras (PROTACs) are molecules that degrade target proteins. Linker length significantly impacts PROTACs' conformational dynamics and degradation efficiency, guiding rational drug design.
Area of Science:
- Biochemistry
- Molecular Biology
- Drug Discovery
Background:
- Proteolysis-targeting chimeras (PROTACs) are heterobifunctional molecules.
- PROTACs recruit E3 ubiquitin ligases to target proteins for ubiquitination and degradation.
- The structural dynamics of PROTAC-mediated ternary complex formation and degradation efficiency are not fully understood.
Purpose of the Study:
- To investigate the impact of linker length on PROTAC conformational dynamics.
- To elucidate the relationship between PROTAC structure and degradation activity.
- To provide mechanistic insights for rational PROTAC design.
Main Methods:
- Employed parallel cascade selection molecular dynamics (PaCS-MD) and outlier flooding (OFLOOD) for extensive conformational searching.
- Utilized Markov state models to analyze conformational landscapes.
- Studied PROTACs with varying linker lengths.
Main Results:
- All PROTACs explored shared a common low free-energy state.
- Significant differences in structural distribution profiles were observed based on linker length.
- Linker-dependent conformational profiles were found to modulate degradation activity and cooperativity.
Conclusions:
- PROTAC linker length critically influences conformational dynamics.
- Understanding these dynamics is key to optimizing PROTAC-mediated protein degradation.
- This study offers valuable insights for the rational design of more effective PROTACs.
