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Investigation of DMSO-induced conformational transitions in human serum albumin using two-dimensional Raman optical activity spectroscopy

Research output: Contribution to journalJournal article

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  • Andrea N. L. Batista
  • Joao M. Batista
  • Lorna Ashton
  • Vanderlan S. Bolzani
  • Maysa Furlan
  • Ewan W. Blanch
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<mark>Journal publication date</mark>09/2014
<mark>Journal</mark>Chirality
Issue number9
Volume26
Number of pages5
Pages (from-to)497-501
Publication statusPublished
Original languageEnglish

Abstract

Recent Raman and Raman optical activity (ROA) results have demonstrated that dimethyl sulfoxide (DMSO) induces the selective conversion of alpha-helix motifs into the poly(L-proline) II (PPII) helix conformation in an array of proteins, while beta-sheets remain mostly unaffected. Human serum albumin (HSA), a highly alpha-helical protein, underwent the most dramatic changes and, therefore, was selected as a model for further investigations into the mechanism of this conformational change. Herein we report the use of two-dimensional ROA correlation analysis applying synchronous, autocorrelation, and moving windows approaches in order to understand the conformational transitions in HSA as a function of DMSO concentration. Our results indicate that the destabilization of native alpha-helix starts at DMSO concentrations as little as 20% in water (v/v), with the transition to PPII helix being complete at similar to 80% DMSO. These results clearly indicate that any protein preparation containing relatively low concentrations of DMSO should consider possible disruptions in alpha-helical domains. (C) 2014 Wiley Periodicals, Inc.