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Updated: Dec 15, 2025

Study of Protein-protein Interactions in Autophagy Research
Published on: September 9, 2017
Structural basis for autophagy inhibition by the human Rubicon-Rab7 complex.
Hersh K Bhargava1,2, Keisuke Tabata3, Jordan M Byck1,2
1Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720.
Rubicon inhibits autophagy by binding Rab7-GTP. Understanding this interaction via crystal structure reveals the Rubicon RH domain as a therapeutic target for enhancing autophagy.
Area of Science:
- Molecular Biology
- Cell Biology
- Structural Biology
Background:
- Rubicon is a key negative regulator of autophagy.
- Rubicon's inhibition of autophagy depends on its interaction with Rab7-GTP.
- Targeting Rubicon offers a potential therapeutic strategy for inducing autophagy.
Purpose of the Study:
- To determine the crystal structure of the Rubicon RH domain in complex with Rab7-GTP.
- To elucidate the molecular mechanism of Rubicon-mediated autophagy inhibition.
- To validate the Rubicon RH domain as a therapeutic target.
Main Methods:
- X-ray crystallography at 2.8 Å resolution.
- Structural analysis of the Rubicon RH domain-Rab7-GTP complex.
- Cellular localization studies and functional assays.
Main Results:
- The crystal structure of the Rubicon RH domain bound to Rab7-GTP was determined.
- The Rubicon RH domain features a unique fold with four zinc clusters.
- Rab7 switch regions bind to distinct pockets on the Rubicon RH domain.
- Rubicon residues at the dimer interface are crucial for colocalization with Rab7.
- Mutations in the Rab7-binding site restore autophagic flux.
Conclusions:
- The Rubicon RH domain-Rab7-GTP structure provides insights into autophagy regulation.
- The Rubicon RH domain is a validated therapeutic target for modulating autophagy.
- Targeting the Rubicon RH domain may lead to novel autophagy-inducing therapies.
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