Izvestiya of Saratov University.

Physics

ISSN 1817-3020 (Print)
ISSN 2542-193X (Online)

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Rovnyagina N. R., Tikhonova T. N., Molodenskiy D. S., Shirshin E. A. Albumin Conformational Changes During Glycation and Thermal Denaturation Processes Revealed by Fluorescence Spectroscopy and Small-angle X-ray Scattering. Izvestiya of Saratov University. Physics , 2017, vol. 17, iss. 3, pp. 179-190. DOI: 10.18500/1817-3020-2017-17-3-179-190

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
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Language: 
Russian
Heading: 
Biophysics and medical physics
UDC: 
53.06; 616-07; 535.3
DOI: 
10.18500/1817-3020-2017-17-3-179-190

Albumin Conformational Changes During Glycation and Thermal Denaturation Processes Revealed by Fluorescence Spectroscopy and Small-angle X-ray Scattering

Autors: 
Rovnyagina Nataliya Romanovna, Lomonosov Moscow State University
Tikhonova Tatiana Nikolaevna, Lomonosov Moscow State University
Molodenskiy Dmitry Sergeevich, National Research Center «Kurchatov Institute»
Shirshin Evgeny Aleksandrovich, Lomonosov Moscow State University
Abstract: 

Background and Objectives: Objects of the research in this study are solutions of bovine serum albumin (BSA) and its aggregates. Structural changes of the protein molecules in solution with pH 3 and pH 7.4 are investigated during glycation and thermal denaturation processes, when the BSA molecules in solution undergo similar intermediate states. The main aim of the research is to compare structural changes of the BSA upon its glycation and thermal denaturation, revealed by combination of optical and X-ray techniques. Materials and Methods: The main techniques used in this study were steady-state and time-resolved fluorescence spectroscopy, as well as small angle X-ray scattering (SAXS). Results: Position of maximum in tryptophan fluorescence spectrum and tryptophan fluorescence lifetime are sensitive to BSA conformational changes at pH 7.4 upon its incubation at 65°C. Availability of hydrophobic binding sites of NR significantly increases upon glycation. No alterations of these photophysical parameters are observed at pH 3. However, SAXS experiments reveal presence of BSA aggregates at 25°C and above. Further incubation of the solution at 65° C is not accompanied by changes in the local environment of tryptophan residues or appearance/accessibility enhancement of hydrophobic sites in the protein structure. Conclusion: This study shows that structural changes of the BSA molecules differ for glycated and thermally denatured / aggregated proteins, though the molecules undergo similar intermediate states during these processes.

Key words: 
glycation
albumin
thermal denaturation
conformation
molten globule
Nile Red
thioflavin T
AGEs (advanced glycation end-products)
-stacking
fibrils
pathological conditions
socially important diseases
fluorescence spectroscopy
Small Angle X-ray Scattering
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