Structural Characterization of Urea-Induced BSA Denaturation Using Size-Exclusion Chromatography Coupled with...

Area of Science:

• Biochemistry
• Structural Biology
• Protein Science

Background:

• Bovine serum albumin (BSA) is a crucial protein with diverse physiological roles.
• Understanding protein structural transitions under denaturing conditions is vital for comprehending protein function and stability.

Purpose of the Study:

• To investigate the urea-induced structural transitions of BSA in solution.
• To characterize the conformational changes and dynamics of BSA under varying urea concentrations.

Main Methods:

• Size-exclusion chromatography coupled with small-angle X-ray scattering (SEC-SAXS) was employed.
• Ab initio 3D modeling using GASBOR and ensemble optimization method (EOM) were utilized for structural analysis.

Main Results:

• Three distinct conformational states of BSA were identified: compact globular (0-3 M urea), partially unfolded intermediate (4 M urea), and highly disordered (5-8 M urea).
• Kratky analysis and structural modeling corroborated these urea-induced transitions.
• Conformational heterogeneity and increased structural flexibility were observed at higher urea concentrations.

Conclusions:

• SEC-SAXS provides detailed insights into BSA unfolding and structural dynamics.
• The study elucidates protein stability and flexibility under denaturing conditions.
• These findings contribute to a deeper understanding of protein structural biology.