4HTA

The structure of the karrikin insensitive (KAI2) protein in Arabidopsis thaliana


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.901 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.155 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

The Structure of the Karrikin-Insensitive Protein (KAI2) in Arabidopsis thaliana

Bythell-Douglas, R.Waters, M.T.Scaffidi, A.Flematti, G.R.Smith, S.M.Bond, C.S.

(2013) Plos One 8: e54758-e54758

  • DOI: 10.1371/journal.pone.0054758
  • Primary Citation of Related Structures:  4HRX, 4HRY

  • PubMed Abstract: 
  • KARRIKIN INSENSITIVE 2 (KAI2) is an α/β hydrolase involved in seed germination and seedling development. It is essential for plant responses to karrikins, a class of butenolide compounds derived from burnt plant material that are structurally similar ...

    KARRIKIN INSENSITIVE 2 (KAI2) is an α/β hydrolase involved in seed germination and seedling development. It is essential for plant responses to karrikins, a class of butenolide compounds derived from burnt plant material that are structurally similar to strigolactone plant hormones. The mechanistic basis for the function of KAI2 in plant development remains unclear. We have determined the crystal structure of Arabidopsis thaliana KAI2 in space groups P2(1) 2(1) 2(1) (a =63.57 Å, b =66.26 Å, c =78.25 Å) and P2(1) (a =50.20 Å, b =56.04 Å, c =52.43 Å, β =116.12°) to 1.55 and 2.11 Å respectively. The catalytic residues are positioned within a large hydrophobic pocket similar to that of DAD2, a protein required for strigolactone response in Petunia hybrida. KAI2 possesses a second solvent-accessible pocket, adjacent to the active site cavity, which offers the possibility of allosteric regulation. The structure of KAI2 is consistent with its designation as a serine hydrolase, as well as previous data implicating the protein in karrikin and strigolactone signalling.


    Organizational Affiliation

    School of Chemistry and Biochemistry, The University of Western Australia, Crawley, WA, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hydrolase, alpha/beta fold family protein
A
288Arabidopsis thalianaGene Names: KAI2 (D14L, HTL)
Find proteins for Q9SZU7 (Arabidopsis thaliana)
Go to UniProtKB:  Q9SZU7
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.901 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.155 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 63.385α = 90.00
b = 66.064β = 90.00
c = 77.620γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
SCALAdata scaling
XDSdata reduction
MOLREPphasing
BUSTERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-02-27
    Type: Initial release