AGAP1 regulates subcellular localization of FilGAP and control cancer cell invasion.

The Arf (ADP-ribosylation factor) GAPs (GTPase-activating proteins) regulate membrane trafficking and actin cytoskeleton. The molecular mechanism of how Arf GAPs regulate actin cytoskeleton remains to be elucidated. We identified AGAP1, a subtype of Arf GAP, as a binding protein of FilGAP, a Rac-specific GAP, in mammalian cells. AGAP1 binds to C-terminus of FilGAP whereas FilGAP binds to N-terminus of AGAP1 containing GLD domain. FilGAP co-localized with AGAP1 at intracellular vesicles and targeting of FilGAP at the vesicles requires its interaction with AGAP1. Consistently, depletion of endogenous AGAP1 induced the accumulation of endogenous FilGAP into paxillin-positive focal adhesions and actin cytoskeletal structures. Knockdown of endogenous AGAP1 suppressed cell spreading on collagen and the suppression was released by depletion of endogenous FilGAP. Moreover, depletion of AGAP1 in MDA-MB-231 cells promoted cell invasion in extracellular matrices and depletion of FilGAP blocked the invasion. Taken together, the present study suggests that AGAP1 may regulate subcellular localization of FilGAP and control cell migration and invasion through interaction with FilGAP.

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