Susceptibility of different proteins to flow-induced conformational changes monitored with Raman spectroscopy

Lorna Ashton, Jonathan Dusting, Eboshogwe Imomoh, Stavroula Balabani, Ewan W. Blanch

    Research output: Contribution to journalArticlepeer-review

    Abstract

    By directly monitoring stirred protein solutions with Raman spectroscopy, the reversible unfolding of proteins caused by fluid shear is examined for several natural proteins with varying structural properties and molecular weight. While complete denaturation is not observed, a wide range of spectral variances occur for the different proteins, indicating subtle conformational changes that appear to be protein-specific. A number of significant overall trends are apparent from the study. For globular proteins, the overall extent of spectral variance increases with protein size and the proportion of β-structure. For two less structured proteins, fetuin and α-casein, the observed changes are of relatively low magnitude, despite the greater molecular structural mobility of these proteins. This implies that other protein-specific factors, such as posttranslational modifications, may also be significant. Individual band changes occurring in the spectral profiles of each individual protein are also discussed in detail. © 2010 by the Biophysical Society.
    Original languageEnglish
    Pages (from-to)707-714
    Number of pages7
    JournalBIOPHYSICAL JOURNAL
    Volume98
    Issue number4
    DOIs
    Publication statusPublished - 17 Feb 2010

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