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Updated: Jul 12, 2026

Analysis of SCAP N-glycosylation and Trafficking in Human Cells
Published on: November 8, 2016
Two human ARFGAPs associated with COP-I-coated vesicles
Gabriella Frigerio1, Neil Grimsey, Martin Dale
1Department of Clinical Biochemistry, Cambridge Institute for Medical Research, University of Cambridge, Hills Road, Cambridge CB2 2XY, United Kingdom.
ADP-ribosylation factor-GTPase-activating proteins (ARFGAPs) ARFGAP2 and ARFGAP3 are identified as key regulators of COP-I-dependent vesicular transport. Their function in the Golgi complex is essential for cell viability, highlighting their critical role in intracellular trafficking.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- ADP-ribosylation factors (ARFs) regulate vesicular trafficking.
- ADP-ribosylation factor-GTPase-activating proteins (ARFGAPs) mediate site-specific ARF regulation.
- Yeast utilizes Glo3p and Gcs1p for essential COP-I-dependent trafficking, with Glo3p having a more significant role.
Purpose of the Study:
- Identify human orthologues of yeast Glo3p.
- Investigate the role of ARFGAP2 and ARFGAP3 in COP-I trafficking.
- Determine the functional redundancy and essentiality of ARFGAPs in mammalian cells.
Main Methods:
- Sequence analysis to identify ARFGAP orthologues.
- Immunofluorescence microscopy to determine subcellular localization.
- In vitro assays using Golgi-derived vesicles.
- In vivo studies involving mutant expression and gene silencing.
Main Results:
- ARFGAP2 and ARFGAP3 identified as human Glo3p orthologues, localizing to the Golgi complex.
- ARFGAP2 and ARFGAP3 associate with COP-I vesicles, unlike ARFGAP1.
- ARFGAP2 directly binds coatomer and inhibits Golgi-to-ER transport when mutated.
- Simultaneous silencing of ARFGAP1, ARFGAP2, and ARFGAP3 leads to cell death.
Conclusions:
- ARFGAP2 and ARFGAP3 are crucial for COP-I-dependent vesicular transport.
- These proteins play essential, non-redundant roles in maintaining cell viability.
- The findings elucidate the functional significance of ARFGAPs in mammalian intracellular trafficking.
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