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Values shown are averages?��?SE of 10 replicates. *P? http://en.wikipedia.org/wiki/ALG1 from roots of Atnar2.1-35S:NAR2.1-myc4 line. Lane 1: microsomal fraction; Lane 2: purified plasma membrane. a. ER marker detected by anti-Bip polyclonal antibody; b. tonoplast marker detected by anti-V-PPase polyclonal antibody; c. AtNRT2.1 detected by anti-AtNRT2.1 antibody and d. AtNAR2.1-myc detected by anti-myc antibody. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer-reviewed http://www.selleckchem.com/products/740-y-p-pdgfr-740y-p.html and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. ""The recent discovery of a variety of receptors has led to new models for hormone perception in plants. In the case of the hormone abscisic acid (ABA), which regulates plant responses to abiotic stress, perception seems to occur both at the plasma membrane and in the cytosol. The cytosolic receptors for ABA have recently been identified as complexes between protein phosphatases 2C (PP2C) and regulatory components (RCAR/PYR/PYL) that bind ABA. Binding of ABA to the receptor complexes inactivates the PP2Cs, thereby activating the large variety of physiological processes regulated by ABA. The Arabidopsis genome encodes 13 homologues of RCAR1 and approximately 80 PP2Cs, of which six in clade A have been identified as negative regulators of ABA responses. In this study we characterize a novel member of the RCAR family, RCAR3. RCAR3 was identified in a screen for interactors of the PP2Cs ABI1 and ABI2, which are key regulators of ABA responses. RCAR3 was shown to repress ABI1 and ABI2 in vitro, and to stimulate ABA signalling in protoplast cells. RCAR3 conferred greater ABA sensitivity to the PP2C regulation than RCAR1, whereas stereo-selectivity http://www.selleckchem.com/products/pd-1-pd-l1-inhibitor-3.html for (S)-ABA was less stringent with RCAR3 as compared with RCAR1. In addition, regulation of the protein phosphatase activity by RCAR1 and RCAR3 was more sensitive to ABA for ABI1 than for ABI2. Based on the differences we have observed in transcriptional regulation and biochemical properties, we propose a model whereby differential expression of the co-receptors and combinatorial assembly of the receptor complexes act in concert to modulate and fine-tune ABA responses. Higher plants are sessile organisms that have evolved a high plasticity for adaptation to environmental challenges. Pathogens and abiotic stress such as drought and salt stress severely impact plant performance and productivity.