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Direct assessment in bacteria of prionoid propagation and phenotype selection by Hsp70 chaperone

AuthorsGasset-Rosa, F. ; Coquel, Anne-Sophie; Moreno-del Álamo, María ; Chen, Peipei; Song, Xiaohu; Serrano-López, Ana; Fernández-Tresguerres, M.E. ; Moreno Díaz de la Espina, Susana ; Lindner, Ariel B.; Giraldo, R.
KeywordsAmyloid proteinopathy
DnaK/Hsp70 chaperone
Escherichia coli
Protein aggregation
RepA-WH1 prionoid
Issue Date9-Feb-2014
PublisherBlackwell Publishing
CitationMolecular Microbiology 91 (6) 1070- 1087 (2014)
AbstractProtein amyloid aggregates epigenetically determine either advantageous or proteinopathic phenotypes. Prions are infectious amyloidogenic proteins, whereas prionoids lack infectivity but spread from mother to daughter cells. While prion amyloidosis has been studied in yeast and mammalian cells models, the dynamics of transmission of an amyloid proteinopathy has not been addressed yet in bacteria. Using time-lapse microscopy and a microfluidic set-up, we have assessed in Escherichia coli the vertical transmission of the amyloidosis caused by the synthetic bacterial model prionoid RepA-WH1 at single cell resolution within their lineage context. We identify in vivo the coexistence of two strain-like types of amyloid aggregates within a genetically identical population and a controlled homogeneous environment. The amyloids are either toxic globular particles or single comet-shaped aggregates that split during cytokinesis and exhibit milder toxicity. Both segregate and propagate in sublineages, yet show interconversion. ClpB (Hsp104) chaperone, key for spreading of yeast prions, has no effect on the dynamics of the two RepA-WH1 aggregates. However, the propagation of the comet-like species is DnaK (Hsp70)-dependent. The bacterial RepA-WH1 prionoid thus provides key qualitative and quantitative clues on the biology of intracellular amyloid proteinopathies. © 2014 John Wiley & Sons Ltd.
Description26 p.-9 fig.-11 sup. fig.
Publisher version (URL)http://dx.doi.org/10.1111/mmi.12518
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