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) in an ABA-independent manner but more efficiently when activated by ABA. Confers enhanced sensitivity to ABA (PubMed:19407143, PubMed:23844015, PubMed:21658606). Can be activated only by (+)-ABA but not by (-)-ABA (PubMed:23844015). Homodimer (PubMed:24645846). Monomer (PubMed:21658606). Binds ABA on one subunit only. Binds to CARs protein in an ABA-independent manner, both at the plasma membrane and in the nucleus (By similarity). Binds specifically (+)-ABA but not (-)-ABA (PubMed:23844015, PubMed:24645846). Interacts with HAB1, ABI1 and ABI2, and possibly with other PP2Cs (PubMed:19407142, PubMed:19407143, PubMed:19874541). Interacts with TOPP1 (PubMed:26943172). Interacts with DDA1 (PubMed:24563205). Localizes at the plasma membrane in the presence of a CAR protein. Expressed in root tips, vascular tissues, stomata, flowers, pollen tubes and developing seeds. 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. Truncated N-terminus. Truncated N-terminus.