Probable regulatory subunit of type 2A protein phosphatase involved in the control of the dynamic organization of the cortical cytoskeleton. Plays an important role in the organization of interphase microtubule arrays in part through the regulation of nucleation geometry. Required for the reorganization of cortical arrays in response to light. Interacts with PP2AA1. Predominantly cytoplasmic, but at the late G2 phase localizes at the cortical region corresponding to the preprophase band. Widely expressed. Extreme phenotype with disrupted cell elongation and a highly compressed apical-basal axis due to disorganization of the interphase microtubule array and lack of the preprophase band before mitosis. Sterile flowers.