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Mammalian Glucose Transporter Activity Is Dependent upon Anionic and Conical Phospholipids
Richard C Hresko1, Thomas E Kraft2, Andrew Quigley3
1From the Departments of Pediatrics and.
The Journal of Biological Chemistry
|June 16, 2016
Summary
Anionic phospholipids activate and stabilize glucose transporters (GLUTs), while conical lipids enhance their activity. This research clarifies how plasma membrane lipids regulate GLUT function and structure.
Area of Science:
- Biochemistry
- Cell Biology
- Membrane Transport
Background:
- Facilitative glucose transporters (GLUTs) regulate glucose movement across cell membranes.
- The influence of phospholipids on GLUT structure and activity is not well understood.
Purpose of the Study:
- To investigate the effects of physiologically relevant phospholipids on glucose transport by GLUT4 and GLUT3.
- To elucidate the mechanisms by which specific lipids modulate GLUT function and stability.
Main Methods:
- Systematic examination of glucose transport in liposomes reconstituted with purified GLUT4 and GLUT3.
- Kinetic analyses to determine the impact of phospholipids on transport parameters (kcat, Km).
Main Results:
- Anionic phospholipids (phosphatidic acid, phosphatidylserine, phosphatidylglycerol, phosphatidylinositol) are essential for GLUT activation and structural stabilization.
- Conical lipids (phosphatidylethanolamine, diacylglycerol) significantly enhance GLUT activity (up to 3-fold) in the presence of anionic lipids.
- Kinetic analysis showed that conical lipids increase the catalytic rate (kcat) but not the substrate affinity (Km).
Conclusions:
- Plasma membrane phospholipids play a critical role in regulating GLUT activation and function.
- This study expands the understanding of membrane protein-lipid interactions within the solute carrier family.
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