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2016 ; 113
(10
): 2720-5
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Identification of a novel cell death-inducing domain reveals that fungal
amyloid-controlled programmed cell death is related to necroptosis
#MMPMID26903619
Daskalov A
; Habenstein B
; Sabaté R
; Berbon M
; Martinez D
; Chaignepain S
; Coulary-Salin B
; Hofmann K
; Loquet A
; Saupe SJ
Proc Natl Acad Sci U S A
2016[Mar]; 113
(10
): 2720-5
PMID26903619
show ga
Recent findings have revealed the role of prion-like mechanisms in the control of
host defense and programmed cell death cascades. In fungi, HET-S, a cell
death-inducing protein containing a HeLo pore-forming domain, is activated
through amyloid templating by a Nod-like receptor (NLR). Here we characterize the
HELLP protein behaving analogously to HET-S and bearing a new type of N-terminal
cell death-inducing domain termed HeLo-like (HELL) and a C-terminal regulatory
amyloid motif known as PP. The gene encoding HELLP is part of a three-gene
cluster also encoding a lipase (SBP) and a Nod-like receptor, both of which
display the PP motif. The PP motif is similar to the RHIM amyloid motif directing
formation of the RIP1/RIP3 necrosome in humans. The C-terminal region of HELLP,
HELLP(215-278), encompassing the motif, allows prion propagation and assembles
into amyloid fibrils, as demonstrated by X-ray diffraction and FTIR analyses.
Solid-state NMR studies reveal a well-ordered local structure of the amyloid core
residues and a primary sequence that is almost entirely arranged in a rigid
conformation, and confirm a ?-sheet structure in an assigned stretch of three
amino acids. HELLP is activated by amyloid templating and displays
membrane-targeting and cell death-inducing activity. HELLP targets the SBP lipase
to the membrane, suggesting a synergy between HELLP and SBP in membrane
dismantling. Remarkably, the HeLo-like domain of HELLP is homologous to the
pore-forming domain of MLKL, the cell death-execution protein in necroptosis,
revealing a transkingdom evolutionary relationship between amyloid-controlled
fungal programmed cell death and mammalian necroptosis.