5CBK

Crystal structure of the strigolactone receptor ShHTL5 from Striga hermonthica

• PDB DOI: https://doi.org/10.2210/pdb5CBK/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Striga hermonthica
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2015-07-01 Released: 2015-10-21 
• Deposition Author(s): Stogios, P.J., Onopriyenko, O., Yim, V., Savchenko, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.46 Å
• R-Value Free: 0.226 
• R-Value Work: 0.168 
• R-Value Observed: 0.171 

Literature

Structure-function analysis identifies highly sensitive strigolactone receptors in Striga.

Toh, S., Holbrook-Smith, D., Stogios, P.J., Onopriyenko, O., Lumba, S., Tsuchiya, Y., Savchenko, A., McCourt, P.

(2015) Science 350: 203-207

• PubMed: 26450211 
• DOI: https://doi.org/10.1126/science.aac9476
• Primary Citation of Related Structures:  
  5CBK


• PubMed Abstract: 
  

  Strigolactones are naturally occurring signaling molecules that affect plant development, fungi-plant interactions, and parasitic plant infestations. We characterized the function of 11 strigolactone receptors from the parasitic plant Striga hermonthica using chemical and structural biology. We found a clade of polyspecific receptors, including one that is sensitive to picomolar concentrations of strigolactone. A crystal structure of a highly sensitive strigolactone receptor from Striga revealed a larger binding pocket than that of the Arabidopsis receptor, which could explain the increased range of strigolactone sensitivity. Thus, the sensitivity of Striga to strigolactones from host plants is driven by receptor sensitivity. By expressing strigolactone receptors in Arabidopsis, we developed a bioassay that can be used to identify chemicals and crops with altered strigolactone levels.

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Organizational Affiliation: 

Cell and Systems Biology, University of Toronto, 25 Willcocks Street, Toronto M5S 3B2, Canada.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Macromolecule Content

• Total Structure Weight: 31.32 kDa 
• Atom Count: 2,461 
• Modelled Residue Count: 271 
• Deposited Residue Count: 271 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ShHTL5	A	271	Striga hermonthica	Mutation(s): 0  Gene Names: ShHTL5
UniProt
Find proteins for A0A0M5I297 (Striga hermonthica) Explore A0A0M5I297  Go to UniProtKB:  A0A0M5I297

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PE3	C [auth A], D [auth A]	3,6,9,12,15,18,21,24,27,30,33,36,39-TRIDECAOXAHENTETRACONTANE-1,41-DIOL C28 H58 O15 ILLKMACMBHTSHP-UHFFFAOYSA-N
CL	E [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.46 Å
• R-Value Free: 0.226 
• R-Value Work: 0.168 
• R-Value Observed: 0.171 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 102.282	α = 90
b = 102.282	β = 90
c = 101.734	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-3000	data reduction
HKL-3000	data scaling
PHASER	phasing
Coot	model building

Structure Validation

Entry History 

Deposition Data

• Released Date: 2015-10-21 
Deposition Author(s): Stogios, P.J., Onopriyenko, O., Yim, V., Savchenko, A.

Revision History  

• Version 1.0: 2015-10-21
  Type: Initial release
  
• Version 1.1: 2023-09-27
  Changes: Data collection, Database references, Derived calculations, Refinement description