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Functional and Structural Insights Into Complex Formation Between OPTN Leucine Zipper Domain and RAB8A.

Kei Okatsu1, Reika Kikuchi2,3, Noriyuki Matsuda3

  • 1Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Japan.

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|August 7, 2025
PubMed
Summary
This summary is machine-generated.

Optineurin (OPTN) regulates vesicular trafficking and selective autophagy by interacting with RAB8A. This interaction, elucidated by crystal structure, is crucial for recruiting ATG9A vesicles, highlighting OPTN's multifunctional role.

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Area of Science:

  • Molecular biology
  • Cell biology
  • Structural biology

Background:

  • Optineurin (OPTN) is a multifunctional adaptor protein.
  • OPTN plays roles in vesicular trafficking and selective autophagy.

Purpose of the Study:

  • Investigate the molecular mechanism of OPTN in regulating vesicular trafficking and selective autophagy.
  • Elucidate the role of the leucine zipper (LZ) domain in OPTN function.

Main Methods:

  • Determined the crystal structure of the OPTN-RAB8A complex.
  • Performed structure-guided mutational analysis.
  • Utilized cell biological approaches and knockout cell lines.

Main Results:

  • OPTN interacts with RAB8A and related RAB proteins (RAB8B, RAB10).
  • Crystal structure revealed specific interaction surfaces between OPTN and RAB8A, distinct from the LZ domain.
  • RAB8A/8B/10 were not essential for mitophagy, but OPTN's RAB8A-binding residues were critical for ATG9A vesicle recruitment.

Conclusions:

  • The study provides molecular insights into how OPTN regulates vesicular trafficking and selective autophagy.
  • The LZ domain of OPTN is key to its multifunctional roles.
  • OPTN's interaction with RAB8A is critical for specific cellular processes like ATG9A vesicle recruitment.