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2015 ; 208
(7
): 987-1001
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CCM2-CCM3 interaction stabilizes their protein expression and permits endothelial
network formation
#MMPMID25825518
Draheim KM
; Li X
; Zhang R
; Fisher OS
; Villari G
; Boggon TJ
; Calderwood DA
J Cell Biol
2015[Mar]; 208
(7
): 987-1001
PMID25825518
show ga
Mutations in the essential adaptor proteins CCM2 or CCM3 lead to cerebral
cavernous malformations (CCM), vascular lesions that most frequently occur in the
brain and are strongly associated with hemorrhagic stroke, seizures, and other
neurological disorders. CCM2 binds CCM3, but the molecular basis of this
interaction, and its functional significance, have not been elucidated. Here, we
used x-ray crystallography and structure-guided mutagenesis to show that an
?-helical LD-like motif within CCM2 binds the highly conserved "HP1" pocket of
the CCM3 focal adhesion targeting (FAT) homology domain. By knocking down CCM2 or
CCM3 and rescuing with binding-deficient mutants, we establish that CCM2-CCM3
interactions protect CCM2 and CCM3 proteins from proteasomal degradation and show
that both CCM2 and CCM3 are required for normal endothelial cell network
formation. However, CCM3 expression in the absence of CCM2 is sufficient to
support normal cell growth, revealing complex-independent roles for CCM3.