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2016 ; 27
(3
): 466-82
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APC binds the Miro/Milton motor complex to stimulate transport of mitochondria to
the plasma membrane
#MMPMID26658612
Mills KM
; Brocardo MG
; Henderson BR
Mol Biol Cell
2016[Feb]; 27
(3
): 466-82
PMID26658612
show ga
Mutations in adenomatous polyposis coli (APC) disrupt regulation of Wnt
signaling, mitosis, and the cytoskeleton. We describe a new role for APC in the
transport of mitochondria. Silencing of wild-type APC by small interfering RNA
caused mitochondria to redistribute from the cell periphery to the perinuclear
region. We identified novel APC interactions with the mitochondrial kinesin-motor
complex Miro/Milton that were mediated by the APC C-terminus. Truncating
mutations in APC abolished its ability to bind Miro/Milton and reduced formation
of the Miro/Milton complex, correlating with disrupted mitochondrial distribution
in colorectal cancer cells that could be recovered by reconstitution of wild-type
APC. Using proximity ligation assays, we identified endogenous APC-Miro/Milton
complexes at mitochondria, and live-cell imaging showed that loss of APC slowed
the frequency of anterograde mitochondrial transport to the membrane. We propose
that APC helps drive mitochondria to the membrane to supply energy for cellular
processes such as directed cell migration, a process disrupted by cancer
mutations.