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Urea-induced structural transformations in bovine serum albumin
M Y Khan1, S K Agarwal, S Hangloo
1Department of Biochemistry, School of Life Sciences, North-Eastern Hill University, Shillong, India.
Journal of Biochemistry
|August 1, 1987
Summary
Urea unfolds bovine serum albumin, revealing a stable intermediate during refolding. This intermediate involves domain III unfolding and domain II structural changes, as observed through spectral and fluorescence methods.
Area of Science:
- Biochemistry
- Protein Chemistry
- Spectroscopy
Background:
- Bovine serum albumin (BSA) is a crucial protein with complex structural domains.
- Understanding protein unfolding mechanisms is vital for biochemistry and drug development.
Purpose of the Study:
- To investigate the urea-induced unfolding and refolding of bovine serum albumin (BSA) and a specific fragment.
- To identify and characterize stable intermediates during the protein transition process.
Main Methods:
- Difference spectral measurements at 288 nm and 293 nm.
- Fluorescence emission measurements.
- Monitoring urea-induced unfolding and refolding transitions.
Main Results:
- A stable intermediate was observed during BSA unfolding-refolding at 288 nm.
- This intermediate was not detectable at 293 nm, indicating domain-specific contributions.
- Fluorescence monitoring confirmed the presence of the intermediate in both BSA and its fragment.
Conclusions:
- The formation of the intermediate in BSA unfolding involves domain III unfolding and domain II structural changes.
- Domain III, lacking tryptophan, plays a key role in intermediate formation.
- Sub-domain separation within domain III may also contribute to the observed intermediate structure.