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Updated: Dec 29, 2025

Rab10 Phosphorylation Detection by LRRK2 Activity Using SDS-PAGE with a Phosphate-binding Tag
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Rab10 Phosphorylation Detection by LRRK2 Activity Using SDS-PAGE with a Phosphate-binding Tag

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Structural Basis for Rab8a Recruitment of RILPL2 via LRRK2 Phosphorylation of Switch 2

Dieter Waschbüsch1, Elena Purlyte2, Prosenjit Pal2

  • 1School of Biochemistry and Immunology, Trinity College, Dublin 2, Ireland.

Structure (London, England : 1993)
|February 5, 2020
PubMed

Insights

Leucine-rich repeat kinase 2 (LRRK2) phosphorylates Rab8a, a protein involved in cell structures. This study reveals the crystal structure of this interaction, uncovering how RILPL2 binds to phospho-Rab8a.

Area of Science:

  • Cell Biology
  • Structural Biology
  • Biochemistry

Background:

  • Rab8a, a Rab GTPase, regulates membrane protrusions in polarized cells.
  • Rab8a is a substrate of leucine-rich repeat kinase 2 (LRRK2), implicated in Parkinson's disease.
  • LRRK2 phosphorylates Rab8a at T72, recruiting RILPL2 to regulate ciliogenesis.

Purpose of the Study:

  • Determine the crystal structure of phospho-Rab8a (pRab8a) in complex with the RILP homology (RH2) domain of RILPL2.
  • Elucidate the molecular mechanism of RILPL2 binding to pRab8a.
  • Propose a general model for phospho-specific effector recognition of phosphorylated Rab GTPases.

Main Methods:

  • X-ray crystallography to determine the structure of the pRab8a-RILPL2 complex.
  • Biochemical assays to analyze protein-protein interactions.
  • Bioinformatic analysis of conserved residues.

Main Results:

  • The crystal structure reveals a heterotetrameric complex of pRab8a and RILPL2.
  • RILPL2 forms a central dimer that bridges two pRab8a molecules.
  • An X-shaped cap (X-cap) formed by RILPL2 N termini orients key residues towards pRab8a's T72 phosphorylation site.
  • Conserved residues in the X-cap of JIP3 and JIP4 suggest a shared binding mechanism with other LRRK2-phosphorylated Rab proteins.

Conclusions:

  • The structure provides atomic-level insight into the interaction between pRab8a and its effector RILPL2.
  • The findings reveal a conserved mechanism for how phospho-specific effectors recognize phosphorylated Rab GTPases.
  • This work contributes to understanding LRRK2-mediated signaling pathways relevant to Parkinson's disease and ciliogenesis.
Keywords:
JNK-interacting protein 3 and 4LRRK2 kinaseRILP-like protein 2Rab8a GTPaseeffectormembrane trafficking

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