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 (PubMed:19624469, PubMed:23844015, PubMed:21658606). Can be activated by both (-)-ABA and (+)-ABA (PubMed:23844015). Monomer (PubMed:21658606). Homodimer. Binds ABA on one subunit only (By similarity). Interacts with HAB1, ABI1 and ABI2, and possibly with other PP2Cs (PubMed:19407142, PubMed:19874541, PubMed:19898420). Binds to CARs protein in an ABA-independent manner, both at the plasma membrane and in the nucleus. Interacts directly with CAR1 and CAR4 (PubMed:25465408). Interacts with TOPP1 (PubMed:26943172). Interacts with DDA1 (PubMed:24563205). Interacts with FREE1 (via N-terminus) (PubMed:27495812). Interacts with the E3 ubiquitin-protein ligase RSL1 at the plasma membrane (PubMed:25330042). Localizes at the plasma membrane in the presence of a CAR protein (e.g. CAR1) (PubMed:25465408). Localized transiently in the vacuole when in complex with RSL1 (PubMed:27495812). 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. Ubiquitynated and degraded by the proteasome upon binding to the E3 ubiquitin-protein ligase RSL1 at the plasma membrane. Belongs to the PYR/PYL/RCAR abscisic acid intracellular receptor family.