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2016 ; 23
(3
): 380-92
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Mic60/Mitofilin determines MICOS assembly essential for mitochondrial dynamics
and mtDNA nucleoid organization
#MMPMID26250910
Li H
; Ruan Y
; Zhang K
; Jian F
; Hu C
; Miao L
; Gong L
; Sun L
; Zhang X
; Chen S
; Chen H
; Liu D
; Song Z
Cell Death Differ
2016[Mar]; 23
(3
): 380-92
PMID26250910
show ga
The MICOS complex (mitochondrial contact site and cristae organizing system) is
essential for mitochondrial inner membrane organization and mitochondrial
membrane contacts, however, the molecular regulation of MICOS assembly and the
physiological functions of MICOS in mammals remain obscure. Here, we report that
Mic60/Mitofilin has a critical role in the MICOS assembly, which determines the
mitochondrial morphology and mitochondrial DNA (mtDNA) organization. The
downregulation of Mic60/Mitofilin or Mic19/CHCHD3 results in instability of other
MICOS components, disassembly of MICOS complex and disorganized mitochondrial
cristae. We show that there exists direct interaction between Mic60/Mitofilin and
Mic19/CHCHD3, which is crucial for their stabilization in mammals. Importantly,
we identified that the mitochondrial i-AAA protease Yme1L regulates
Mic60/Mitofilin homeostasis. Impaired MICOS assembly causes the formation of
'giant mitochondria' because of dysregulated mitochondrial fusion and fission.
Also, mtDNA nucleoids are disorganized and clustered in these giant mitochondria
in which mtDNA transcription is attenuated because of remarkable downregulation
of some key mtDNA nucleoid-associated proteins. Together, these findings
demonstrate that Mic60/Mitofilin homeostasis regulated by Yme1L is central to the
MICOS assembly, which is required for maintenance of mitochondrial morphology and
organization of mtDNA nucleoids.