Recombinant Arabidopsis thaliana ABC transporter G family member 40 (ABCG40), partial

High affinity abscisic acid (ABA) transporter that mediates the import of ABA, with a preference for (+)-ABA, through the plasma membrane, especially in guard cells, and is involved in the intercellular and intracellular ABA signaling pathways leading, for example, to stomatal closure, thus conferring drought tolerance. Together with ABCG30, import into the embryo the ABA delivered from the endosperm via ABCG25 and ABCG31-mediated export to suppress radicle extension and subsequent embryonic growth. May be a general defense protein. Functions as a pump to exclude Pb(2+) ions and/or Pb(2+)-containing toxic compounds from the cytoplasm. Contributes to Pb(2+) ions resistance. Confers some resistance to the terpene sclareol.; (Microbial infection) Involved in resistance response to the pathogenic oomycetes Phytophthora infestans and Phytophthora capsici.