4HTA

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.156 

wwPDB Validation 3D Report Full Report



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, 4HTA

  • 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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Hydrolase, alpha/beta fold family proteinA288Arabidopsis thalianaMutation(s): 0 
Gene Names: F6G17.120At4g37470KAI2D14LHTL
Find proteins for Q9SZU7 (Arabidopsis thaliana)
Explore Q9SZU7 
Go to UniProtKB:  Q9SZU7
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

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

Download CCD File 
A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.156 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.385α = 90
b = 66.064β = 90
c = 77.62γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
MOLREPphasing
BUSTERrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

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