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Updated: Jul 11, 2026
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A Protocol for Real-time 3D Single Particle Tracking
Published on: January 3, 2018
Location, location, location: membrane targeting directed by PX domains.
T K Sato1, M Overduin, S D Emr
1Department of Cellular and Molecular Medicine and Howard Hughes Medical Institute, University of California at San Diego School of Medicine, La Jolla, CA 92093-0668, USA.
Science (New York, N.Y.)
|December 1, 2001
Summary
Phox homology (PX) domains target cell-signaling proteins to membranes by binding phosphoinositides (PIs). These interactions, along with protein-protein binding, ensure correct protein localization for various cellular functions.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Phosphoinositide (PI)-binding domains are crucial for the intracellular localization of cell-signaling proteins.
- The Phox homology (PX) domain is a key protein module mediating these interactions.
Purpose of the Study:
- To elucidate the mechanism by which PX domains target proteins to organelle membranes.
- To understand the role of PI-binding in regulating PX domain-containing proteins.
Main Methods:
- Analysis of conserved basic motifs within the PX domain.
- Investigation of interactions between PX domains and specific phosphoinositides (PIs).
Main Results:
- PX domains utilize two conserved basic motifs for specific PI binding.
- This protein-lipid interaction, combined with protein-protein interactions, dictates protein localization.
- Proper localization enables PX domain proteins to participate in diverse cellular pathways.
Conclusions:
- PX domains are essential regulators of protein localization via PI interactions.
- These interactions are fundamental for diverse cellular processes including signaling, transport, and defense.
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