Aggregates with lysozyme and ovalbumin show features of amyloid-like fibrils

Yasushi Sugimoto, Yoshiki Kamada, Yuhei Tokunaga, Hiroshi Shinohara, Mitsuharu Matsumoto, Takahiro Kusakabe, Takatoshi Ohkuri, Tadashi Ueda

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The interaction of egg-white lysozyme with N-ovalbumin, the native form of egg-white ovalbumin with the denaturation temperature, T m, 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 m 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.

Original languageEnglish
Pages (from-to)533-544
Number of pages12
JournalBiochemistry and Cell Biology
Volume89
Issue number6
DOIs
Publication statusPublished - Dec 2011

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Cell Biology
  • Molecular Biology

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