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2016 ; 12
(4
): 689-702
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Mitophagy receptor FUNDC1 regulates mitochondrial dynamics and mitophagy
#MMPMID27050458
Chen M
; Chen Z
; Wang Y
; Tan Z
; Zhu C
; Li Y
; Han Z
; Chen L
; Gao R
; Liu L
; Chen Q
Autophagy
2016[]; 12
(4
): 689-702
PMID27050458
show ga
Mitochondrial fragmentation due to imbalanced fission and fusion of mitochondria
is a prerequisite for mitophagy, however, the exact "coupling" of mitochondrial
dynamics and mitophagy remains unclear. We have previously identified that FUNDC1
recruits MAP1LC3B/LC3B (LC3) through its LC3-interacting region (LIR) motif to
initiate mitophagy in mammalian cells. Here, we show that FUNDC1 interacts with
both DNM1L/DRP1 and OPA1 to coordinate mitochondrial fission or fusion and
mitophagy. OPA1 interacted with FUNDC1 via its Lys70 (K70) residue, and mutation
of K70 to Ala (A), but not to Arg (R), abolished the interaction and promoted
mitochondrial fission and mitophagy. Mitochondrial stress such as selenite or
FCCP treatment caused the disassembly of the FUNDC1-OPA1 complex while enhancing
DNM1L recruitment to the mitochondria. Furthermore, we observed that
dephosphorylation of FUNDC1 under stress conditions promotes the dissociation of
FUNDC1 from OPA1 and association with DNM1L. Our data suggest that FUNDC1
regulates both mitochondrial fission or fusion and mitophagy and mediates the
"coupling" across the double membrane for mitochondrial dynamics and quality
control.