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Glycation Enhances Protein Association with Lipid Bilayer Membranes.
Beatrice Barletti1,2, Nicoló Paracini3, Giovanna Fragneto3
1Université Grenoble-Alpes, CNRS, Grenoble INP, TIMC/SyNaBi (UMR 5525), Grenoble 38000, France.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 12, 2025
Summary
Glycation, a process linked to diabetes, enhances protein binding to negatively charged cell membranes. This finding impacts understanding of protein behavior in the bloodstream and biomarker reliability.
Area of Science:
- Biochemistry
- Biophysics
- Materials Science
Background:
- Glycation is a nonenzymatic modification forming advanced glycation end-products (AGEs), implicated in diabetes.
- Glycated proteins may have altered interactions with lipid interfaces, affecting biological distribution and diagnostic accuracy.
- Bovine serum albumin (BSA) and its glycated form (gBSA) serve as models for protein-lipid interactions.
Purpose of the Study:
- To investigate how glycation affects the interaction of BSA with lipid bilayers.
- To understand the influence of membrane charge and fluidity on protein-glycation interactions.
- To elucidate the nanostructural changes in protein-lipid interactions upon glycation.
Main Methods:
- Utilized supported lipid bilayers (SLBs) with varying compositions to model cell membranes.
- Employed neutron reflectometry (NR) to compare membrane association of BSA and gBSA.
- Analyzed nanostructural changes and protein volume fraction at the bilayer interface.
Main Results:
- BSA and gBSA showed minimal interaction with zwitterionic or cationic membranes.
- Significant binding of both BSA and gBSA to negatively charged bilayers was observed.
- Glycation significantly amplified protein-lipid interaction, increasing membrane-associated protein volume fraction from 0.11 (BSA) to 0.17 (gBSA).
Conclusions:
- Glycation modifies protein surface properties, promoting stronger interactions with negatively charged membranes.
- Protein-glycation-lipid interactions are lipid-dependent, impacting protein bioavailability and behavior.
- Findings underscore the need to consider glycation's effect on protein-lipid interactions for biomarker reliability and diabetes pathophysiology.
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