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2016 ; 63
(5
): 768-80
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Polyphosphate: A Conserved Modifier of Amyloidogenic Processes
#MMPMID27570072
Cremers CM
; Knoefler D
; Gates S
; Martin N
; Dahl JU
; Lempart J
; Xie L
; Chapman MR
; Galvan V
; Southworth DR
; Jakob U
Mol Cell
2016[Sep]; 63
(5
): 768-80
PMID27570072
show ga
Polyphosphate (polyP), a several billion-year-old biopolymer, is produced in
every cell, tissue, and organism studied. Structurally extremely simple, polyP
consists of long chains of covalently linked inorganic phosphate groups. We
report here the surprising discovery that polyP shows a remarkable efficacy in
accelerating amyloid fibril formation. We found that polyP serves as an effective
nucleation source for various different amyloid proteins, ranging from bacterial
CsgA to human ?-synuclein, A?1-40/42, and Tau. polyP-associated ?-synuclein
fibrils show distinct differences in seeding behavior, morphology, and fibril
stability compared with fibrils formed in the absence of polyP. In vivo, the
amyloid-stimulating and fibril-stabilizing effects of polyP have wide-reaching
consequences, increasing the rate of biofilm formation in pathogenic bacteria and
mitigating amyloid toxicity in differentiated neuroblastoma cells and C. elegans
strains that serve as models for human folding diseases. These results suggest
that we have discovered a conserved cytoprotective modifier of amyloidogenic
processes.