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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 8
BKCSDE 29(8)
August 20, 2008 

Molecular Simulations for Anti-amyloidogenic Effect of Flavonoid Myricetin Exerted against Alzheimer’s β-Amyloid Fibrils Formation
Youngjin Choi, Thomas Donghyun Kim, Seung R. Paik, Karpjoo Jeong*, Seunho Jung*
Amyloid fibril, Conformational analysis, Flavonoid, Molecular dynamics simulations, Myricetin
Comparative molecular simulations were performed to establish molecular interaction and inhibitory effect of flavonoid myricetin on formation of amyloid fibris. For computational comparison, the conformational stability of myricetin with amyloid β-peptide (Aβ) and β-amyloid fibrils (fAβ) were traced with multiple molecular dynamics simulations (MD) using the CHARMM program from Monte Carlo docked structures. Simulations showed that the inhibition by myricetin involves binding of the flavonoid to fAβ rather than Aβ. Even in MD simulations over 5 ns at 300 K, myricetin/fAβ complex remained stable in compact conformation for multiple trajectories. In contrast, myricetin/Aβ complex mostly turned into the dissociated conformation during the MD simulations at 300 K. These multiple MD simulations provide a theoretical basis for the higher inhibitory effect of myricetin on fibrillogenesis of fAβ relative to Aβ . Significant binding between myricetin and fAβ observed from the computational simulations clearly reflects the previous experimental results in which only fAβ had bound to the myricetin molecules.
1505 - 1509
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