3NMT

Crystal structure of pyrabactin bound abscisic acid receptor PYL2 mutant A93F in complex with type 2C protein phosphatase HAB1

Summary for 3NMT

• Entry DOI: 10.2210/pdb3nmt/pdb
• Related: 3KB3 3NMH 3NMN 3NMP 3NMV
• Descriptor: Abscisic acid receptor PYL2, Protein phosphatase 2C 16, 4-bromo-N-(pyridin-2-ylmethyl)naphthalene-1-sulfonamide, ... (6 entities in total)
• Functional Keywords: pyl2, pyrabactin, abscisic acid receptor, helix-grip fold, protein binding
• Biological source: Arabidopsis thaliana (mouse-ear cress,thale-cress); More
• Cellular location: Cytoplasm : O80992 Q9CAJ0
• Total number of polymer chains: 2
• Total formula weight: 58540.93

Authors

Zhou, X.E.,Melcher, K.,Ng, L.-M.,Soon, F.-F.,Xu, Y.,Suino-Powell, K.M.,Kovach, A.,Li, J.,Yong, E.-L.,Xu, H.E. (deposition date: 2010-06-22, release date: 2010-08-25, Last modification date: 2023-09-06)

Primary citation

Melcher, K.,Xu, Y.,Ng, L.M.,Zhou, X.E.,Soon, F.F.,Chinnusamy, V.,Suino-Powell, K.M.,Kovach, A.,Tham, F.S.,Cutler, S.R.,Li, J.,Yong, E.L.,Zhu, J.K.,Xu, H.E.
Identification and mechanism of ABA receptor antagonism.
Nat.Struct.Mol.Biol., 17:1102-1108, 2010

PubMed Abstract: The phytohormone abscisic acid (ABA) functions through a family of fourteen PYR/PYL receptors, which were identified by resistance to pyrabactin, a synthetic inhibitor of seed germination. ABA activates these receptors to inhibit type 2C protein phosphatases, such as ABI1, yet it remains unclear whether these receptors can be antagonized. Here we demonstrate that pyrabactin is an agonist of PYR1 and PYL1 but is unexpectedly an antagonist of PYL2. Crystal structures of the PYL2-pyrabactin and PYL1-pyrabactin-ABI1 complexes reveal the mechanism responsible for receptor-selective activation and inhibition, which enables us to design mutations that convert PYL1 to a pyrabactin-inhibited receptor and PYL2 to a pyrabactin-activated receptor and to identify new pyrabactin-based ABA receptor agonists. Together, our results establish a new concept of ABA receptor antagonism, illustrate its underlying mechanisms and provide a rational framework for discovering novel ABA receptor ligands.

PubMed: 20729862
DOI: 10.1038/nsmb.1887

Experimental method

X-RAY DIFFRACTION (2.56 Å)