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Shear-induced unfolding of lysozyme monitored in situ

Ashton, Lorna and Dusting, Jonathan and Imomoh, Eboshogwe and Balabani, Stavroula and Blanch, Ewan W. (2009) Shear-induced unfolding of lysozyme monitored in situ. Biophysical Journal, 96 (10). pp. 4231-4236. ISSN 0006-3495

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Abstract

Conformational changes due to externally applied physiochemical parameters, including pH, temperature, solvent composition, and mechanical forces, have been extensively reported for numerous proteins. However, investigations on the effect of fluid shear flow on protein conformation remain inconclusive despite its importance not only in the research of protein dynamics but also for biotechnology applications where processes such as pumping, filtration, and mixing may expose protein solutions to changes in protein structure. By combining particle image velocimetry and Raman spectroscopy, we have successfully monitored reversible, shear-induced structural changes of lysozyme in well-characterized flows. Shearing of lysozyme in water altered the protein's backbone structure, whereas similar shear rates in glycerol solution affected the solvent exposure of side-chain residues located toward the exterior of the lysozyme alpha-domain. The results demonstrate the importance of measuring conformational changes in situ and of quantifying fluid stresses by the three-dimensional shear tensor to establish reversible unfolding or misfolding transitions occurring due to flow exposure.

Item Type: Article
Journal or Publication Title: Biophysical Journal
Uncontrolled Keywords: EXCITED RAMAN-SPECTROSCOPY ; EGG-WHITE LYSOZYME ; POLY-L-LYSINE ; HEN LYSOZYME ; COUETTE FLOW ; TRANSITION ; PROTEINS ; BIOMOLECULES ; EQUILIBRIUM ; BIOREACTOR
Subjects:
Departments:
ID Code: 71939
Deposited By: ep_importer_pure
Deposited On: 28 Nov 2014 12:30
Refereed?: Yes
Published?: Published
Last Modified: 21 Sep 2017 06:19
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/71939

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