Receptor for abscisic acid (ABA) required for ABA-mediated responses such as stomatal closure and germination inhibition. Inhibits the activity of group-A protein phosphatases type 2C (PP2Cs) when activated by ABA (By similarity). Suppresses the phosphatase activity of TOPP1 in a dose-dependent manner in vitro (PubMed:26943172). Homodimer. Binds ABA on one subunit only. Interacts with PP2Cs. Binds to CARs protein in an ABA-independent manner, both at the plasma membrane and in the nucleus (By similarity). Interacts with I-2 and TOPP1 (PubMed:26943172). Localizes at the plasma membrane in the presence of a CAR protein. Upon interaction with ABA, the 'latch' and 'gate' loops change in conformation leading to a tight dimerization and the creation a surface that enables the receptor to dock into and inhibit the PP2C active site. Belongs to the PYR/PYL/RCAR abscisic acid intracellular receptor family.