Aggregates with lysozyme and ovalbumin show features of amyloid-like fibrils
Biochemistry and Cell Biology, ISSN: 0829-8211, Vol: 89, Issue: 6, Page: 533-544
2011
- 47Citations
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Aggregates with lysozyme and ovalbumin show features of amyloid-likefibrils
Introduction Misfolding and aggregation of proteins often cause serious pathological disorders via the deposition of amyloid fibrils (Chiti and Dobson 2006). These possess a common
Article Description
The interaction of egg-white lysozyme with N-ovalbumin, the native form of egg-white ovalbumin with the denaturation temperature, T , of 78 °C, was investigated by the inhibition of lysozyme muramidase activity, differential scanning calorimetry, and circular dichroism assay as indicators. Signals for the interaction were the most prominent when the mixture of lysozyme and N-ovalbumin was co-heated at 72 °C, slightly lower than the T of N-ovalbumin. The interaction was also marked when unheated lysozyme was mixed with N-ovalbumin preheated at 72 °C. Moreover, the mixture rapidly formed fibrous precipitates, which were positive for thioflavin T fluorescent emission, a marker for the amyloid fibril formation. Also electron microscopic observation exhibited features of fibrils. The interaction potency of ovalbumin was ascribed to the tryptic fragment ILELPFASGT MSMLVLLPDE VSGLEQLESIINFEK (residues 229-263), derived from the 2B strands 2 and 3 of ovalbumin. From lysozyme, on the other hand, the chymotryptic peptide RNRCKGTDVQAW (residues 112-123), including cluster 6, and the chymotryptic/tryptic peptide GILQINSRW (residues 54-62), including cluster 3, were responsible for the interaction with N-ovalbumin. Interestingly, this nonamer peptide was found to have the ability to self-aggregate. To the authors knowledge, this may be the first report to document the possible involvement of dual proteins in the formation of amyloid-like fibrils. © 2011 Published by NRC Research Press.
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