Biological Assembly 1  

 3D View: Structure | Electron Density | 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: 82.48 kDa 
• Atom Count: 4579 
• Modelled Residue Count: 563 
• Deposited Residue Count: 724 
• Unique protein chains: 1

3ZUU

The structure of OST1 (D160A, S175D) kinase in complex with gold

• DOI: 10.2210/pdb3ZUU/pdb

• Classification: TRANSFERASE
• Organism(s): Arabidopsis thaliana
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2011-07-20 Released: 2011-10-12 
• Deposition Author(s): Yunta, C., Martinez-Ripoll, M., Albert, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.279 
• R-Value Work: 0.238 
• R-Value Observed: 0.240 

Literature

The structure of Arabidopsis thaliana OST1 provides insights into the kinase regulation mechanism in response to osmotic stress.

Yunta, C., Martinez-Ripoll, M., Zhu, J.K., Albert, A.

(2011) J Mol Biol 414: 135-144

• PubMed: 21983340 
• DOI: 10.1016/j.jmb.2011.09.041
• Primary Citation of Related Structures:  
  3ZUT, 3ZUU


• PubMed Abstract: 
  

SnRK [SNF1 (sucrose non-fermenting-1)-related protein kinase] 2.6 [open stomata 1 (OST1)] is well characterized at molecular and physiological levels to control stomata closure in response to water-deficit stress. OST1 is a member of a family of 10 protein kinases from Arabidopsis thaliana (SnRK2) that integrates abscisic acid (ABA)-dependent and ABA-independent signals to coordinate the cell response to osmotic stress. A subgroup of protein phosphatases type 2C binds OST1 and keeps the kinase dephosphorylated and inactive. Activation of OST1 relies on the ABA-dependent inhibition of the protein phosphatases type 2C and the subsequent self-phosphorylation of the kinase. The OST1 ABA-independent activation depends on a short sequence motif that is conserved among all the members of the SnRK2 family. However, little is known about the molecular mechanism underlying this regulation. The crystallographic structure of OST1 shows that ABA-independent regulation motif stabilizes the conformation of the kinase catalytically essential α C helix, and it provides the basis of the ABA-independent regulation mechanism for the SnRK2 family of protein kinases.

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Organizational Affiliation: 

Departamento de Cristalografía y Biología Estructural, Instituto de Química Física Rocasolano, Consejo Superior de Investigaciones Científicas, Serrano 119, Madrid E-28006, Spain.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein kinase SRK2E	A, B	362	Arabidopsis thaliana	Mutation(s): 0  Gene Names: SRK2E, OST1, SNRK2.6, At4g33950, F17I5.140 EC: 2.7.11.1
UniProt
Find proteins for Q940H6 (Arabidopsis thaliana) Explore Q940H6  Go to UniProtKB:  Q940H6

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
AU	D [auth A]	GOLD ION Au ZBKIUFWVEIBQRT-UHFFFAOYSA-N
EDO	C [auth A], E [auth B]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.279 
• R-Value Work: 0.238 
• R-Value Observed: 0.240 
• Space Group: P 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 77.57	α = 90
b = 99.017	β = 90
c = 108.451	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
SCALA	data scaling
Auto-Rickshaw	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-07-20 
• Released Date: 2011-10-12 
Deposition Author(s): Yunta, C., Martinez-Ripoll, M., Albert, A.

Revision History  

• Version 1.0: 2011-10-12
  Type: Initial release
  
• Version 1.1: 2011-11-23
  Changes: Database references
• Version 1.2: 2018-10-24
  Changes: Data collection, Database references, Source and taxonomy, Structure summary