Figure 5.
ROP regulation of cytoskeleton organization. A, Cortical MT reordering by ROP6, RIC1, and KTN1. RIC1 interacts physically with and promotes the MT severing by KTN1, leading to MT reordering. B, Localized cortical MT depolymerization. In developing metaxylem, MT depolarization takes place by the recruitment of MIDD1 and Kinesin13A to active ROP11 domains. C, Actin dynamics in tip-growing pollen tubes. ROP regulates actin assembly by two counteracting pathways. RIC4 promotes assembly, whereas RIC3 causes disassembly by stimulating Ca2+ influx into the cytoplasm. D, Actin nucleation/branching in trichomes and pavement cells. ROPs and the ROPGEF SPK1 interact with the SCAR/WAVE complex and promote actin filament nucleation/branching.