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Quantitative Localization of a Golgi Protein by Imaging Its Center of Fluorescence Mass
Published on: August 10, 2017
ARL4A acts with GCC185 to modulate Golgi complex organization.
Yu-Chun Lin1, Tsai-Chen Chiang, Yu-Tsan Liu
1Institute of Molecular Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.
Journal of Cell Science
|December 14, 2011
Summary
ADP-ribosylation factor-like protein 4A (ARL4A) modulates Golgi organization by interacting with GCC185. This interaction is crucial for maintaining Golgi structure and endosome-to-Golgi transport, impacting cytoplasmic linker-associated proteins.
Area of Science:
- Cell Biology
- Molecular Biology
- Golgi apparatus function
Background:
- ADP-ribosylation factor-like protein 4A (ARL4A) is a GTPase family member with unclear function.
- The trans-Golgi network protein GCC185 is essential for Golgi structure and endosome-to-Golgi transport.
Purpose of the Study:
- To investigate the functional relationship between ARL4A and GCC185.
- To elucidate the role of ARL4A in Golgi organization and transport.
Main Methods:
- GTP-dependent interaction assays between ARL4A and GCC185.
- Depletion studies of ARL4A and GCC185.
- Analysis of Golgi structure and endosome-to-Golgi transport.
- Investigation of protein-protein interactions involving GCC185 and CLASPs.
Main Results:
- ARL4A directly interacts with GCC185 in a GTP-dependent manner, requiring specific regions of GCC185's CC2 domain.
- Depletion of ARL4A phenocopies GCC185 depletion, leading to Golgi fragmentation and impaired endosome-to-Golgi transport.
- ARL4A facilitates the interaction between GCC185 and CLASPs, which is vital for Golgi structure maintenance.
Conclusions:
- ARL4A acts as a novel effector for GCC185, modulating Golgi organization.
- ARL4A is critical for maintaining Golgi integrity by regulating the GCC185-CLASP interaction.
- The ARL4A-GCC185-CLASP pathway is essential for Golgi structure and function.
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