4LGB

ABA-mimicking ligand N-(1-METHYL-2-OXO-1,2,3,4-TETRAHYDROQUINOLIN-6-YL)-1-(4-METHYLPHENYL)METHANESULFONAMIDE in complex with ABA receptor PYL2 and PP2C HAB1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.270 
  • R-Value Observed: 0.272 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

An ABA-mimicking ligand that reduces water loss and promotes drought resistance in plants.

Cao, M.Liu, X.Zhang, Y.Xue, X.Zhou, X.E.Melcher, K.Gao, P.Wang, F.Zeng, L.Zhao, Y.Zhao, Y.Deng, P.Zhong, D.Zhu, J.K.Xu, H.E.Xu, Y.

(2013) Cell Res 23: 1043-1054

  • DOI: https://doi.org/10.1038/cr.2013.95
  • Primary Citation of Related Structures:  
    4LG5, 4LGA, 4LGB

  • PubMed Abstract: 

    Abscisic acid (ABA) is the most important hormone for plants to resist drought and other abiotic stresses. ABA binds directly to the PYR/PYL family of ABA receptors, resulting in inhibition of type 2C phosphatases (PP2C) and activation of downstream ABA signaling. It is envisioned that intervention of ABA signaling by small molecules could help plants to overcome abiotic stresses such as drought, cold and soil salinity. However, chemical instability and rapid catabolism by plant enzymes limit the practical application of ABA itself. Here we report the identification of a small molecule ABA mimic (AM1) that acts as a potent activator of multiple members of the family of ABA receptors. In Arabidopsis, AM1 activates a gene network that is highly similar to that induced by ABA. Treatments with AM1 inhibit seed germination, prevent leaf water loss, and promote drought resistance. We solved the crystal structure of AM1 in complex with the PYL2 ABA receptor and the HAB1 PP2C, which revealed that AM1 mediates a gate-latch-lock interacting network, a structural feature that is conserved in the ABA-bound receptor/PP2C complex. Together, these results demonstrate that a single small molecule ABA mimic can activate multiple ABA receptors and protect plants from water loss and drought stress. Moreover, the AM1 complex crystal structure provides a structural basis for designing the next generation of ABA-mimicking small molecules.


  • Organizational Affiliation

    Shanghai Center for Plant Stress Biology, Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, 300 Fenglin Road, Shanghai 200032, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Abscisic acid receptor PYL2177Arabidopsis thalianaMutation(s): 0 
Gene Names: PYL2RCAR14At2g26040T19L18.15
UniProt
Find proteins for O80992 (Arabidopsis thaliana)
Explore O80992 
Go to UniProtKB:  O80992
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO80992
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Protein phosphatase 2C 16341Arabidopsis thalianaMutation(s): 0 
Gene Names: At1g72770F28P22.4HAB1P2C-HA
EC: 3.1.3.16
UniProt
Find proteins for Q9CAJ0 (Arabidopsis thaliana)
Explore Q9CAJ0 
Go to UniProtKB:  Q9CAJ0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9CAJ0
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.270 
  • R-Value Observed: 0.272 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.957α = 90
b = 66.173β = 90
c = 143.841γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CNSrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
HKL-2000data reduction
PHASESphasing
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-14
    Type: Initial release
  • Version 1.1: 2019-07-17
    Changes: Data collection, Refinement description
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description