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Related Experiment Video

Updated: Jun 27, 2026

The Microscopy-Based Assay to Study and Analyze the Recycling Endosomes using SNARE Trafficking

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Published on: February 12, 2022

Rap2 function requires palmitoylation and recycling endosome localization.

Yukiko Uechi¹, Maitsetseg Bayarjargal, Masato Umikawa

¹Division of Cell Biology, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan.

Biochemical and Biophysical Research Communications

|December 9, 2008

Summary

Palmitoylation is crucial for Rap2 proteins to associate with membranes and activate TNIK. All Rap2 proteins, including Rap2B, require palmitoylation for TNIK-mediated cell spreading suppression and localization to recycling endosomes.

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Detection of Protein Palmitoylation in Cultured Hippocampal Neurons by Immunoprecipitation and Acyl-Biotin Exchange (ABE)

Detection of Protein Palmitoylation in Cultured Hippocampal Neurons by Immunoprecipitation and Acyl-Biotin Exchange (ABE)

Published on: February 18, 2013

Area of Science:

Cellular biology
Molecular signaling
Protein post-translational modification

Background:

Rap2 proteins (Rap2A, Rap2B, Rap2C) are Ras-like small G proteins with poorly understood signaling pathways.
The Traf2- and Nck-interacting kinase (TNIK) has been identified as a specific effector of Rap2 proteins.
Post-translational modifications, such as farnesylation and geranylgeranylation, are known for Rap2 proteins, but the role of palmitoylation is unclear.

Purpose of the Study:

To investigate the role of post-translational processing, specifically palmitoylation, in the function of Rap2 proteins.
To elucidate the downstream signaling pathways of Rap2 proteins involving TNIK.
To determine the subcellular localization of Rap2 proteins and their interaction with TNIK.

Main Methods:

Expression of Rap2A, Rap2B, and Rap2C in HEK293T and COS-1 cells.
Analysis of membrane association and TNIK activation using biochemical assays.
Investigation of TNIK-mediated phenotypes, including cell spreading.
Subcellular localization studies using microscopy to observe Rap2 protein and TNIK distribution.

Main Results:

Rap2A and Rap2C, but not Rap2B, require palmitoylation for membrane association and TNIK activation.
All Rap2 proteins require palmitoylation for the induction of TNIK-mediated suppression of cell spreading.
Rap2 proteins and TNIK co-localize to recycling endosomes in a palmitoylation-dependent manner.
Rap2 proteins do not localize to the Golgi or endoplasmic reticulum.

Conclusions:

Palmitoylation is a critical post-translational modification for Rap2 protein function, influencing membrane association, TNIK activation, and cellular phenotypes.
Recycling endosomes serve as key platforms for Rap2 protein-TNIK complex formation and signaling.
These findings highlight the importance of palmitoylation and specific subcellular localization in regulating Rap2 protein cellular functions.