Stimulates the GTPase/ATPase activities of Obg-like ATPases (By similarity). Mediates the transient calcium-dependent interaction of PYR/PYL/RCAR abscisic acid (ABA) receptors with the plasma membrane and thus regulates ABA sensitivity (PubMed:25465408). Binds liposomes in the absence of exogenous Ca(2+), but this activity is enhanced in the presence of Ca(2+) and generates membrane curvature (By similarity). Dimers and oligomers (By similarity). Binds to PYR/PYL/RCAR abscisic acid intracellular receptors in an ABA-independent manner, both at the plasma membrane and in the nucleus. Interacts directly with PYR1, PYL1, PYL4, PYL6 and PYL8. Binds phospholipids in a Ca(2+)-dependent manner. Additional isoforms seem to exist. Expressed in roots. Predominantly expressed in the vascular bundle of the primary root and in the cortex of the root upper part. In lateral roots, detected in epidermis and root tips. When associated with disruption in CAR4, CAR5 and CAR9 genes, reduced sensitivity to abscisic acid (ABA) during seedling establishment and root growth regulation. Belongs to the plant CAR protein family.