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2016 ; 214
(6
): 705-18
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Munc18-1 is a molecular chaperone for ?-synuclein, controlling its
self-replicating aggregation
#MMPMID27597756
Chai YJ
; Sierecki E
; Tomatis VM
; Gormal RS
; Giles N
; Morrow IC
; Xia D
; Götz J
; Parton RG
; Collins BM
; Gambin Y
; Meunier FA
J Cell Biol
2016[Sep]; 214
(6
): 705-18
PMID27597756
show ga
Munc18-1 is a key component of the exocytic machinery that controls
neurotransmitter release. Munc18-1 heterozygous mutations cause developmental
defects and epileptic phenotypes, including infantile epileptic encephalopathy
(EIEE), suggestive of a gain of pathological function. Here, we used
single-molecule analysis, gene-edited cells, and neurons to demonstrate that
Munc18-1 EIEE-causing mutants form large polymers that coaggregate wild-type
Munc18-1 in vitro and in cells. Surprisingly, Munc18-1 EIEE mutants also form
Lewy body-like structures that contain ?-synuclein (?-Syn). We reveal that
Munc18-1 binds ?-Syn, and its EIEE mutants coaggregate ?-Syn. Likewise, removal
of endogenous Munc18-1 increases the aggregative propensity of ?-Syn(WT) and that
of the Parkinson's disease-causing ?-Syn(A30P) mutant, an effect rescued by
Munc18-1(WT) expression, indicative of chaperone activity. Coexpression of the
?-Syn(A30P) mutant with Munc18-1 reduced the number of ?-Syn(A30P) aggregates.
Munc18-1 mutations and haploinsufficiency may therefore trigger a pathogenic gain
of function through both the corruption of native Munc18-1 and a perturbed
chaperone activity for ?-Syn leading to aggregation-induced neurodegeneration.