[No authors listed]
Abscisic acid (ABA) is one of the most essential phytohormones, and plays an important role in growth and development regulation, as well as in stress responses. The PYR/PYL/RCAR family (PYL for short)-comprised of 14 proteins in Arabidopsis-was recently identified as soluble ABA receptors that function in the perception and transduction of ABA signaling. In this work, the crystal structures of PYL10 were determined in the apo- and ABA-bound states, with respective resolutions of 3.0 and 2.7Ã . Surprisingly, a closed CL2 conformation was observed in the apo-PYL10 structure, which was different from a previously reported open CL2 conformation. A putative two-conformation dynamical equilibrium model was proposed to explain PYL10's constitutive binding to PP2Cs in the apo-state and its increased PP2C binding ability in the ABA-bound state.
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