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2015 ; 25
(10
): 1108-20
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Dynamic tubulation of mitochondria drives mitochondrial network formation
#MMPMID26206315
Wang C
; Du W
; Su QP
; Zhu M
; Feng P
; Li Y
; Zhou Y
; Mi N
; Zhu Y
; Jiang D
; Zhang S
; Zhang Z
; Sun Y
; Yu L
Cell Res
2015[Oct]; 25
(10
): 1108-20
PMID26206315
show ga
Mitochondria form networks. Formation of mitochondrial networks is important for
maintaining mitochondrial DNA integrity and interchanging mitochondrial material,
whereas disruption of the mitochondrial network affects mitochondrial functions.
According to the current view, mitochondrial networks are formed by fusion of
individual mitochondria. Here, we report a new mechanism for formation of
mitochondrial networks through KIF5B-mediated dynamic tubulation of mitochondria.
We found that KIF5B pulls thin, highly dynamic tubules out of mitochondria.
Fusion of these dynamic tubules, which is mediated by mitofusins, gives rise to
the mitochondrial network. We further demonstrated that dynamic tubulation and
fusion is sufficient for mitochondrial network formation, by reconstituting
mitochondrial networks in vitro using purified fusion-competent mitochondria,
recombinant KIF5B, and polymerized microtubules. Interestingly, KIF5B only
controls network formation in the peripheral zone of the cell, indicating that
the mitochondrial network is divided into subzones, which may be constructed by
different mechanisms. Our data not only uncover an essential mechanism for
mitochondrial network formation, but also reveal that different parts of the
mitochondrial network are formed by different mechanisms.