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2014 ; 10
(6
): 1105-19
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BECN1 is involved in the initiation of mitophagy: it facilitates PARK2
translocation to mitochondria
#MMPMID24879156
Choubey V
; Cagalinec M
; Liiv J
; Safiulina D
; Hickey MA
; Kuum M
; Liiv M
; Anwar T
; Eskelinen EL
; Kaasik A
Autophagy
2014[Jun]; 10
(6
): 1105-19
PMID24879156
show ga
The autophagy protein BECN1/Beclin 1 is known to play a central role in
autophagosome formation and maturation. The results presented here demonstrate
that BECN1 interacts with the Parkinson disease-related protein PARK2. This
interaction does not require PARK2 translocation to mitochondria and occurs
mostly in cytosol. However, our results suggest that BECN1 is involved in PARK2
translocation to mitochondria because loss of BECN1 inhibits CCCP- or PINK1
overexpression-induced PARK2 translocation. Our results also demonstrate that the
observed PARK2-BECN1 interaction is functionally important. Measurements of the
level of MFN2 (mitofusin 2), a PARK2 substrate, demonstrate that depletion of
BECN1 prevents PARK2 translocation-induced MFN2 ubiquitination and loss. BECN1
depletion also rescues the MFN2 loss-induced suppression of mitochondrial fusion.
In sum, our results demonstrate that BECN1 interacts with PARK2 and regulates
PARK2 translocation to mitochondria as well as PARK2-induced mitophagy prior to
autophagosome formation.