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https://hdl.handle.net/2440/56458
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Type: | Journal article |
Title: | Dephosphorylation of αs- and β-Caseins and Its Effect on Chaperone Activity: A Structural and Functional Investigation |
Other Titles: | Dephosphorylation of alpha(s)- and beta-caseins and its effect on chaperone activity: A structural and functional investigation |
Author: | Koudelka, T. Hoffmann, P. Carver, J. |
Citation: | Journal of Agricultural and Food Chemistry, 2009; 57(13):5956-5964 |
Publisher: | Amer Chemical Soc |
Issue Date: | 2009 |
ISSN: | 0021-8561 1520-5118 |
Statement of Responsibility: | Tomas Koudelka, Peter Hoffmann and John A. Carver |
Abstract: | Milk casein proteins can act as molecular chaperones: under conditions of stress, such as elevated temperature, molecular chaperones stabilize proteins from unfolding, aggregating, and precipitating. In this study, αs- and β-caseins were dephosphorylated using alkaline phosphatase. A structural and functional investigation was undertaken to determine the effect of dephosphorylation on the chaperone activity of αs- and β-caseins against two types of protein misfolding, i.e., amorphous aggregation and amyloid fibril assembly. The dephosphorylation of αs- and β-caseins resulted in a decrease in the chaperone efficiency against both heat- and reduction-induced amorphously aggregating target proteins. In contrast, dephosphorylation had no effect on the chaperone activity of αs- and β-caseins against the amyloid-forming target protein κ-casein. Circular dichroism and fluorescence spectroscopic data indicated that the loss of negative charge associated with dephosphorylation led to an increase in ordered structure of αs- and β-caseins. It is concluded that the flexible, dynamic, and relatively unstructured and amphiphatic nature of αs- and β-caseins is important in their chaperone action. |
Keywords: | Casein proteins molecular chaperone protein aggregation amyloid fibril |
Description: | © 2009 American Chemical Society |
DOI: | 10.1021/jf9008372 |
Published version: | http://dx.doi.org/10.1021/jf9008372 |
Appears in Collections: | Aurora harvest Chemistry and Physics publications |
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