Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 46.54 kDa 
• Atom Count: 2824 
• Modelled Residue Count: 331 
• Deposited Residue Count: 410 
• Unique protein chains: 1

3OQU

Crystal structure of native abscisic acid receptor PYL9 with ABA

• PDB DOI: 10.2210/pdb3OQU/pdb

• Classification: HORMONE RECEPTOR
• Organism(s): Arabidopsis thaliana
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-09-04 Released: 2011-09-14 
• Deposition Author(s): Zhang, X., Zhang, Q., Chen, Z.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.68 Å
• R-Value Free: 0.204 
• R-Value Work: 0.177 
• R-Value Observed: 0.179 

Literature

Structural Insights into the Abscisic Acid Stereospecificity by the ABA Receptors PYR/PYL/RCAR

Zhang, X., Jiang, L., Wang, G., Yu, L., Zhang, Q., Xin, Q., Wu, W., Gong, Z., Chen, Z.

(2013) PLoS One 8: e67477-e67477

• PubMed: 23844015 
• DOI: 10.1371/journal.pone.0067477
• Primary Citation of Related Structures:  
  3OQU, 4JDA, 4JDL


• PubMed Abstract: 
  

The phytohormone abscisic acid ((+)-ABA) plays a key role in many processes. The biological and biochemical activities of unnatural (-)-ABA have been extensively investigated since 1960s. However, the recognition mechanism by which only a few members among PYR/PYL/RCAR (PYLs) family can bind (-)-ABA remains largely unknown. Here we systematically characterized the affinity of PYLs binding to the (-)-ABA and reported the crystal structures of apo-PYL5, PYL3-(-)-ABA and PYL9-(+)-ABA. PYL5 showed the strongest binding affinity with (-)-ABA among all the PYLs. PYL9 is a stringently exclusive (+)-ABA receptor with interchangeable disulfide bonds shared by a subclass of PYLs. PYL3 is a dual receptor to both ABA enantiomers. The binding orientation and pocket of (-)-ABA in PYLs are obviously different from those of (+)-ABA. Steric hindrance and hydrophobic interaction are the two key factors in determining the stereospecificity of PYLs binding to (-)-ABA, which is further confirmed by gain-of-function and loss-of-function mutagenesis. Our results provide novel insights of the bioactivity of ABA enantiomers onto PYLs, and shed light on designing the selective ABA receptors agonists.

---

Organizational Affiliation: 

State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing, China.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Abscisic acid receptor PYL9	A, B	205	Arabidopsis thaliana	Mutation(s): 0  Gene Names: PYL9, RCAR1, At1g01360, F6F3.16
UniProt
Find proteins for Q84MC7 (Arabidopsis thaliana) Explore Q84MC7  Go to UniProtKB:  Q84MC7

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
A8S	C [auth A], D [auth B]	(2Z,4E)-5-[(1S)-1-hydroxy-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl]-3-methylpenta-2,4-dienoic acid C15 H20 O4 JLIDBLDQVAYHNE-YKALOCIXSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.68 Å
• R-Value Free: 0.204 
• R-Value Work: 0.177 
• R-Value Observed: 0.179 
• Space Group: P 3₂

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 112.024	α = 90
b = 112.024	β = 90
c = 40.433	γ = 120

Software Package:

Software Name	Purpose
MAR345dtb	data collection
PHASES	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-09-04 
• Released Date: 2011-09-14 
Deposition Author(s): Zhang, X., Zhang, Q., Chen, Z.

Revision History  

• Version 1.0: 2011-09-14
  Type: Initial release
  
• Version 1.1: 2013-07-31
  Changes: Database references