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2015 ; 208
(7
): 961-74
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WISp39 binds phosphorylated Coronin 1B to regulate Arp2/3 localization and
Cofilin-dependent motility
#MMPMID25800056
Howell M
; Brickner H
; Delorme-Walker VD
; Choi J
; Saffin JM
; Miller D
; Panopoulos A
; DerMardirossian C
; Fotedar A
; Margolis RL
; Fotedar R
J Cell Biol
2015[Mar]; 208
(7
): 961-74
PMID25800056
show ga
We previously identified Waf1 Cip1 stabilizing protein 39 (WISp39) as a binding
partner for heat shock protein 90 (Hsp90). We now report that WISp39 has an
essential function in the control of directed cell migration, which requires
WISp39 interaction with Hsp90. WISp39 knockdown (KD) resulted in the loss of
directional motility of mammalian cells and profound changes in cell morphology,
including the loss of a single leading edge. WISp39 binds Coronin 1B, known to
regulate the Arp2/3 complex and Cofilin at the leading edge. WISp39
preferentially interacts with phosphorylated Coronin 1B, allowing it to complex
with Slingshot phosphatase (SSH) to dephosphorylate and activate Cofilin. WISp39
also regulates Arp2/3 complex localization at the leading edge. WISp39 KD-induced
morphological changes could be rescued by overexpression of Coronin 1B together
with a constitutively active Cofilin mutant. We conclude that WISp39 associates
with Hsp90, Coronin 1B, and SSH to regulate Cofilin activation and Arp2/3 complex
localization at the leading edge.