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2016 ; 129
(5
): 994-1002
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Appoptosin interacts with mitochondrial outer-membrane fusion proteins and
regulates mitochondrial morphology
#MMPMID26813789
Zhang C
; Shi Z
; Zhang L
; Zhou Z
; Zheng X
; Liu G
; Bu G
; Fraser PE
; Xu H
; Zhang YW
J Cell Sci
2016[Mar]; 129
(5
): 994-1002
PMID26813789
show ga
Mitochondrial morphology is regulated by fusion and fission machinery. Impaired
mitochondria dynamics cause various diseases, including Alzheimer's disease.
Appoptosin (encoded by SLC25A38) is a mitochondrial carrier protein that is
located in the mitochondrial inner membrane. Appoptosin overexpression causes
overproduction of reactive oxygen species (ROS) and caspase-dependent apoptosis,
whereas appoptosin downregulation abolishes ?-amyloid-induced mitochondrial
fragmentation and neuronal death during Alzheimer's disease. Herein, we found
that overexpression of appoptosin resulted in mitochondrial fragmentation in a
manner independent of its carrier function, ROS production or caspase activation.
Although appoptosin did not affect levels of mitochondrial outer-membrane fusion
(MFN1 and MFN2), inner-membrane fusion (OPA1) and fission [DRP1 (also known as
DNM1L) and FIS1] proteins, appoptosin interacted with MFN1 and MFN2, as well as
with the mitochondrial ubiquitin ligase MITOL (also known as MARCH5) but not
OPA1, FIS1 or DRP1. Appoptosin overexpression impaired the interaction between
MFN1 and MFN2, and mitochondrial fusion. By contrast, co-expression of MFN1,
MITOL and a dominant-negative form of DRP1, DRP1(K38A), partially rescued
appoptosin-induced mitochondrial fragmentation and apoptosis, whereas
co-expression of FIS1 aggravated appoptosin-induced apoptosis. Together, our
results demonstrate that appoptosin can interact with mitochondrial
outer-membrane fusion proteins and regulates mitochondrial morphology.