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 (By similarity). Prevents hypocotyl bending as well as gravitropic response under blue light conditions (PubMed:21367967). Binds to PYR/PYL/RCAR abscisic acid intracellular receptors in an ABA-independent manner, both at the plasma membrane and in the nucleus (By similarity). Subunit of a complex made of CAR6, PHOT1 and RPT3/NPH3. Interacts directly with RPT3/NPH3 (PubMed:21367967). Increased sensitivity to blue light leading to an enhanced phototropic bending and a faster response to gravitropic stimulus. Belongs to the plant CAR protein family.