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Stable and unstable mutant lysozymes in long helices B and C were constructed to evaluate the effect of the helices on amyloid fibril formation at pH 2. Stable mutant N27D and unstable mutant K33D in the B-helix did not change in amyloid fibril formation. In contrast, stable mutant N93D and unstable mutant K97D in the C-helix showed big differences in behavior as to amyloid fibril formation. Stable mutant N93D showed a longer lag phase of aggregation and suppressed the amyloid fibril formation, whereas unstable mutant K97D showed a shorter lag phase of aggregation and accelerated amyloid fibril formation. These results suggest that the long C-helix is involved mainly in the alpha-helix to beta-sheet transition during amyloid formation of lysozyme.

Amyloid Fibril Formation of Hen Lysozyme Depends on the Instability of the C-Helix (88-99)