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Binding of pentagalloyl glucose to two globular proteins occurs via multiple surface sites

Dobreva, M. A., Frazier, R. A., Mueller-Harvey, I., Clifton, L.A., Gea, A. and Green, R. J. (2011) Binding of pentagalloyl glucose to two globular proteins occurs via multiple surface sites. Biomacromolecules, 12 (3). pp. 710-715. ISSN 1525-7797

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To link to this article DOI: 10.1021/bm101341s

Abstract/Summary

The interaction between pentagalloyl glucose (PGG) and two globular proteins, bovine serum albumin (BSA) and ribulose-1,5-bisphosphate carboxylase oxygenase (rubisco), was investigated by isothermal titration calorimetry (ITC). ITC data fit to a binding model consisting of two sets of multiple binding sites, which reveal similarities in the mode of binding of PGG to BSA and rubisco. In both cases, the interaction is characterized by a high number of binding sites, which suggests that binding occurs by a surface adsorption mechanism that leads to coating of the protein surface, which promotes aggregation and precipitation of the PGG-protein complex. This model was confirmed by turbidimetry analysis of the PGG-BSA interaction. Analysis of tryptophan fluorescence quenching during the interaction of PGG with BSA suggests that binding of PGG leads to some conformational changes that are energetically closer to the unfolded state of the BSA structure, because small red shifts in the resulting emission spectra were observed.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences
Faculty of Life Sciences > School of Agriculture, Policy and Development > Food Production and Quality Division > Animal Science Research Group (ASRG)
Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:17182
Publisher:American Chemical Society

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