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2016 ; 6
(ä): 24656
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Electrostatically-guided inhibition of Curli amyloid nucleation by the CsgC-like
family of chaperones
#MMPMID27098162
Taylor JD
; Hawthorne WJ
; Lo J
; Dear A
; Jain N
; Meisl G
; Andreasen M
; Fletcher C
; Koch M
; Darvill N
; Scull N
; Escalera-Maurer A
; Sefer L
; Wenman R
; Lambert S
; Jean J
; Xu Y
; Turner B
; Kazarian SG
; Chapman MR
; Bubeck D
; de Simone A
; Knowles TP
; Matthews SJ
Sci Rep
2016[Apr]; 6
(ä): 24656
PMID27098162
show ga
Polypeptide aggregation into amyloid is linked with several debilitating human
diseases. Despite the inherent risk of aggregation-induced cytotoxicity, bacteria
control the export of amyloid-prone subunits and assemble adhesive amyloid fibres
during biofilm formation. An Escherichia protein, CsgC potently inhibits amyloid
formation of curli amyloid proteins. Here we unlock its mechanism of action, and
show that CsgC strongly inhibits primary nucleation via electrostatically-guided
molecular encounters, which expands the conformational distribution of disordered
curli subunits. This delays the formation of higher order intermediates and
maintains amyloidogenic subunits in a secretion-competent form. New structural
insight also reveal that CsgC is part of diverse family of bacterial amyloid
inhibitors. Curli assembly is therefore not only arrested in the periplasm, but
the preservation of conformational flexibility also enables efficient secretion
to the cell surface. Understanding how bacteria safely handle amyloidogenic
polypeptides contribute towards efforts to control aggregation in disease-causing
amyloids and amyloid-based biotechnological applications.