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pH-induced conformational transitions in alpha-lactalbumin investigated with two-dimensional Raman correlation variance plots and moving windows

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>16/06/2010
<mark>Journal</mark>Journal of Molecular Structure
Issue number1-3
Number of pages7
Pages (from-to)132-138
Publication StatusPublished
<mark>Original language</mark>English
Event5th International Symposium on Two Dimensional Correlation Spectroscopy - Wroclaw, Poland
Duration: 5/08/20097/08/2009


Conference5th International Symposium on Two Dimensional Correlation Spectroscopy


Raman spectroscopy is being increasingly applied to the investigation of conformational transitions in polypeptides and proteins, and in particular protein unfolding, due to its ability to monitor changes in secondary structure. Here we focus on the application of two different two-dimensional correlation methods, autocorrelation and moving windows techniques, to investigate the pH-induced conformational transitions in alpha-lactalbumin monitored with Raman scattering. From our results we have identified three distinct stages in the conformational transition occurring at ranges similar to pH 6.5-4.6, similar to pH 4.6-3.6 and similar to pH 3.6-1.8, suggesting the existence of three possible conformational species. The first two transition phases the conformational changes are predominantly occurring in the backbone secondary structure, while in the final transition phase changes are occurring in both secondary structure and side chain residue solvent exposure. (C) 2010 Elsevier B.V. All rights reserved.