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Rho GTPases control a complex network of intracellular signalling pathways. Whereas progress has been made in identifying downstream signalling partners for these proteins, the characterization of Rho upstream regulatory guanine-nucleotide exchange factors (GEFs) has been hampered by a lack of suitable research tools. Here we use small interfering RNAs (siRNAs) to examine the cellular regulation of the RhoB GTPase, and show that RhoB is activated downstream of the epidermal-growth-factor receptor through the Vav2 exchange factor. These studies demonstrate that siRNAs are an ideal research tool for the assignment of Rho GEF function in vivo.

Small interfering RNAs as a tool to assign Rho GTPase exchange-factor function in vivo