STEF/TIAM2-mediated Rac1 activity at the nuclear envelope regulates the perinuclear actin cap

Abstract

The perinuclear actin cap determines nuclear morphology but its regulation is currently poorly understood. Here, the authors find that an activator of the Rac1 GTPase, STEF/TIAM2, localises to the nuclear envelope and contributes to perinuclear actin and myosin tension, which in turn regulates the actin cap.