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Membrane targeting: getting Arl to the Golgi.
1Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235-1634, USA. tr.graham@vanderbilt.edu
Current Biology : CB
|June 19, 2004
Summary
Amino-terminal acetylation, not myristoylation, targets Arf-like protein 3 (Arl3p) to the Golgi. This process involves interaction with the Sys1 membrane protein, revealing a novel mechanism for small GTPase localization.
Area of Science:
- Cellular biology
- Molecular biology
- Protein trafficking
Background:
- Post-translational modifications like myristoylation and prenylation are crucial for small GTPase membrane association.
- The Ras superfamily of small GTPases plays vital roles in cellular signaling and membrane trafficking.
Purpose of the Study:
- To investigate the specific post-translational modifications required for the Golgi targeting of the Arf-like protein Arl3p.
- To elucidate the molecular mechanism underlying Arl3p localization to the Golgi apparatus.
Main Methods:
- Analysis of Arf-like protein 3 (Arl3p) modifications.
- Investigating protein-protein interactions between Arl3p and membrane proteins.
- Golgi localization assays.
Main Results:
- Amino-terminal acetylation of Arl3p, rather than myristoylation, is essential for its Golgi targeting.
- Arl3p localization to the Golgi is mediated by its interaction with the integral membrane protein Sys1.
Conclusions:
- N-terminal acetylation is a key determinant for Arl3p Golgi localization.
- The Arl3p-Sys1 interaction represents a novel pathway for regulating small GTPase function and localization at the Golgi.