GEFH1 binds ASAP1 and regulates podosome formation.

Abstract:

:Invadopodia are cellular structures that are thought to mediate tumor invasion. ASAP1, an Arf GTPase-activating protein (GAP) containing a BAR domain, is a substrate of Src. ASAP1 is required for the assembly of invadopodia and podosomes, which are Src-induced structures related to invadopodia in NIH 3T3 fibroblasts. The BAR domain of ASAP1 is required for the assembly of podosomes. Using two-hybrid screening, we have identified GEFH1, a guanine nucleotide exchange factor for RhoA, as a binding partner of the BAR domain of ASAP1. We validated the interaction of endogenous GEFH1 with ASAP1 by immunoprecipitation, and found GEFH1 colocalized with ASAP1 in podosomes. The overexpression of GEFH1 inhibited podosome assembly and ASAP1 catalytic activity as a GAP. A mutant of GEFH1 lacking the domain that binds to the BAR domain of ASAP1 was less effective. Reduced expression of GEFH1, achieved with siRNA treatment, did not affect matrix degradation by podosomes but increased the rate of podosome assembly. Based on these results, we conclude that GEFH1 is a negative regulator of podosomes.

authors

Shiba Y,Randazzo PA

doi

10.1016/j.bbrc.2011.02.093

subject

Has Abstract

pub_date

2011-03-25 00:00:00

pages

574-9

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(11)00298-1

journal_volume

406

pub_type

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