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2016 ; 35
(17
): 1853-67
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Autophagosome-lysosome fusion in neurons requires INPP5E, a protein associated
with Joubert syndrome
#MMPMID27340123
Hasegawa J
; Iwamoto R
; Otomo T
; Nezu A
; Hamasaki M
; Yoshimori T
EMBO J
2016[Sep]; 35
(17
): 1853-67
PMID27340123
show ga
Autophagy is a multistep membrane traffic pathway. In contrast to autophagosome
formation, the mechanisms underlying autophagosome-lysosome fusion remain largely
unknown. Here, we describe a novel autophagy regulator, inositol
polyphosphate-5-phosphatase E (INPP5E), involved in autophagosome-lysosome fusion
process. In neuronal cells, INPP5E knockdown strongly inhibited autophagy by
impairing the fusion step. A fraction of INPP5E is localized to lysosomes, and
its membrane anchoring and enzymatic activity are necessary for autophagy. INPP5E
decreases lysosomal phosphatidylinositol 3,5-bisphosphate (PI(3,5)P2), one of the
substrates of the phosphatase, that counteracts cortactin-mediated actin filament
stabilization on lysosomes. Lysosomes require actin filaments on their surface
for fusing with autophagosomes. INPP5E is one of the genes responsible for
Joubert syndrome, a rare brain abnormality, and mutations found in patients with
this disease caused defects in autophagy. Taken together, our data reveal a novel
role of phosphoinositide on lysosomes and an association between autophagy and
neuronal disease.