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Revealing Advanced Glycation End Products Associated Structural Changes in Serum Albumin
Alex Naftaly1, Roza Izgilov1, Eman Omari1
1Department of Cell and Developmental Biology, Sackler School of Medicine, Tel Aviv University, Levanon St., P.O. Box 39040, Tel Aviv 6997801, Israel.
Protein glycation, particularly by methylglyoxal (MGO) and glycolaldehyde (GAD), induces structural changes in serum albumin (SA), promoting amyloid fibril formation and aggregation under physiological conditions.
Area of Science:
- Biochemistry
- Structural Biology
- Biophysics
Background:
- Protein structural alterations significantly impact physiological functions.
- Nonenzymatic glycation leads to protein conformational changes, forming advanced glycation end products (AGEs) and amyloid structures.
Purpose of the Study:
- To characterize in vitro protein glycation under physiological conditions using serum albumin (SA) as a model.
- To investigate the nanoscale structural changes, oligomerization, and aggregation of glycated SA.
Main Methods:
- Multidimensional spectroscopy (Thioflavin-T, 8-anilinonaphthalene-1-sulfonic acid), Transmission Electron Microscopy (TEM), Dynamic Light Scattering (DLS).
- SDS gel electrophoresis, mass photometry (MP), and rheology measurements were employed to analyze structural modifications and material properties.
Main Results:
- Glycation altered SA's helical conformation, promoting beta-sheet-rich amyloid fibril formation.
- Methylglyoxal (MGO) and glycolaldehyde (GAD) induced insoluble SA aggregates and increased material stiffness.
- Spectroscopy, imaging, and rheology confirmed nanoscale conformational changes, oligomerization, and aggregation of glycated SA.
Conclusions:
- This study provides a comprehensive nanoscale understanding of serum albumin glycation, oligomerization, and aggregation under physiological conditions.
- The findings highlight the significant impact of specific glycation agents on protein structure and material properties.
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