Aggregation of -Lactoglobulin Regulated by Glucosylation

K. Broersen, E. Elshof, J. de Groot, A.G.J. Voragen, R.J. Hamer, H.H.J. de Jongh

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19 Citations (Scopus)

Abstract

A large number of proteins are glycosylated, either in vivo or as a result of industrial processing. Even though the effect of glycosylation on the aggregation of proteins has been studied extensively in the past, some reports show that the aggregation process is accelerated, whereas others found that the process is inhibited by glycosylation. This paper investigates the reasons behind these controversial results as well as the potential mechanism of the effect of glucosylation on aggregation using bovine -lactoglobulin as a model. Glucosylation was found to inhibit denaturant-induced aggregation, whereas heat-induced aggregation was accelerated. It was also found that the kinetic partitioning from an unfolded state was driven toward refolding for glucosylated protein, whereas aggregation was the preferred route for the nonglucosylated protein. Keywords: Aggregation; glucosylation; -lactoglobulin; hydrophobicity; electrostatic repulsion; unfolding/refolding
Original languageEnglish
Pages (from-to)2431-2437
JournalJournal of Agricultural and Food Chemistry
Volume55
Issue number6
DOIs
Publication statusPublished - 2007

Keywords

  • heat-induced aggregation
  • amyloid formation
  • fibril formation
  • protein
  • glycoprotein
  • stability
  • hydrophobicity
  • glycosylation
  • calreticulin
  • denaturation

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