Formation of amyloid-like fibrils upon limited proteolysis of bovine α-lactalbumin

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Bovine α-lactalbumin (α-LA) (10 g L-1) was incubated with a protease from Bacillus licheniformis at pH 7.5 and 50°C. The reaction was biphasic consisting of an initial hydrolysis of intact α-LA and formation of dimers from large hydrolysis products within 60 min followed by aggregation of dimers into aggregates of 500 kDa. The aggregates consisted primarily of fibrillar strands with a diameter of 5 nm. Formation of these strands was accompanied by a change in secondary structure towards higher β-sheet content and strong binding of thioflavin, features shared with amyloidal fibrils. The main components in these fibrils were fragments of 8.8 and 9.8 kDa shown to occur in a monomer-dimer equilibrium. These fragments were identified and a molecular mechanism involving side-by-side assembly of dimers of these fragments into fibrils is proposed.

Original languageEnglish
JournalInternational Dairy Journal
Issue number3
Pages (from-to)219-229
Number of pages11
Publication statusPublished - 2005

    Research areas

  • α-Lactalbumin, Amyloid fibrils, Assembly, Fragments, Proteolysis

ID: 226823565