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2015 ; 58
(2
): 244-54
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Extracellular regulated kinase phosphorylates mitofusin 1 to control
mitochondrial morphology and apoptosis
#MMPMID25801171
Pyakurel A
; Savoia C
; Hess D
; Scorrano L
Mol Cell
2015[Apr]; 58
(2
): 244-54
PMID25801171
show ga
Controlled changes in mitochondrial morphology participate in cellular signaling
cascades. However, the molecular mechanisms modifying mitochondrial shape are
largely unknown. Here we show that the mitogen-activated protein (MAP) kinase
cascade member extracellular-signal-regulated kinase (ERK) phosphorylates the
pro-fusion protein mitofusin (MFN) 1, modulating its participation in apoptosis
and mitochondrial fusion. Phosphoproteomic and biochemical analyses revealed that
MFN1 is phosphorylated at an atypical ERK site in its heptad repeat (HR) 1
domain. This site proved essential to mediate MFN1-dependent mitochondrial
elongation and apoptosis regulation by the MEK/ERK cascade. A mutant mimicking
constitutive MFN1 phosphorylation was less efficient in oligomerizing and
mitochondria tethering but bound more avidly to the proapoptotic BCL-2 family
member BAK, facilitating its activation and cell death. Moreover, neuronal
apoptosis following oxygen glucose deprivation and MEK/ERK activation required an
intact MFN1(T562). Our data identify MFN1 as an ERK target to modulate
mitochondrial shape and apoptosis.