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2015 ; 863
(ä): 139-61
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The Effect of (-)-Epigallo-catechin-(3)-gallate on Amyloidogenic Proteins
Suggests a Common Mechanism
#MMPMID26092630
Andrich K
; Bieschke J
Adv Exp Med Biol
2015[]; 863
(ä): 139-61
PMID26092630
show ga
Studies on the interaction of the green tea polyphenol
(-)-Epigallocatechin-3-gallate (EGCG) with fourteen disease-related amyloid
polypeptides and prions Huntingtin, Amyloid-beta, alpha-Synuclein, islet amyloid
polypeptide (IAPP), Sup35, NM25 and NM4, tau, MSP2, semen-derived enhancer of
virus infection (SEVI), immunoglobulin light chains, beta-microglobulin, prion
protein (PrP) and Insulin, have yielded a variety of experimental observations.
Here, we analyze whether these observations could be explained by a common
mechanism and give a broad overview of the published experimental data on the
actions of EGCG. Firstly, we look at the influence of EGCG on aggregate toxicity,
morphology, seeding competence, stability and conformational changes. Secondly,
we screened publications elucidating the biochemical mechanism of EGCG
intervention, notably the effect of EGCG on aggregation kinetics, oligomeric
aggregation intermediates, and its binding mode to polypeptides. We hypothesize
that the experimental results may be reconciled in a common mechanism, in which
EGCG binds to cross-beta sheet aggregation intermediates. The relative position
of these species in the energy profile of the amyloid cascade would determine the
net effect of EGCG on aggregation and disaggregation of amyloid fibrils.