Sulphotransferase-18 from Arabidopsis thaliana in complex with 3'-phosphoadenosine 5'-phosphate (PAP)

Experimental Data Snapshot

  • Resolution: 1.74 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

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Structural and biochemical studies of sulphotransferase 18 from Arabidopsis thaliana explain its substrate specificity and reaction mechanism.

Hirschmann, F.Krause, F.Baruch, P.Chizhov, I.Mueller, J.W.Manstein, D.J.Papenbrock, J.Fedorov, R.

(2017) Sci Rep 7: 4160-4160

  • DOI: https://doi.org/10.1038/s41598-017-04539-2
  • Primary Citation of Related Structures:  
    5MEK, 5MEX

  • PubMed Abstract: 

    Sulphotransferases are a diverse group of enzymes catalysing the transfer of a sulfuryl group from 3'-phosphoadenosine 5'-phosphosulphate (PAPS) to a broad range of secondary metabolites. They exist in all kingdoms of life. In Arabidopsis thaliana (L.) Heynh. twenty-two sulphotransferase (SOT) isoforms were identified. Three of those are involved in glucosinolate (Gl) biosynthesis, glycosylated sulphur-containing aldoximes containing chemically different side chains, whose break-down products are involved in stress response against herbivores, pathogens, and abiotic stress. To explain the differences in substrate specificity of desulpho (ds)-Gl SOTs and to understand the reaction mechanism of plant SOTs, we determined the first high-resolution crystal structure of the plant ds-Gl SOT AtSOT18 in complex with 3'-phosphoadenosine 5'-phosphate (PAP) alone and together with the Gl sinigrin. These new structural insights into the determination of substrate specificity were complemented by mutagenesis studies. The structure of AtSOT18 invigorates the similarity between plant and mammalian sulphotransferases, which illustrates the evolutionary conservation of this multifunctional enzyme family. We identified the essential residues for substrate binding and catalysis and demonstrated that the catalytic mechanism is conserved between human and plant enzymes. Our study indicates that the loop-gating mechanism is likely to be a source of the substrate specificity in plants.

  • Organizational Affiliation

    Institute of Botany, Leibniz University Hannover, Herrenhäuserstr. 2, D-30419, Hannover, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytosolic sulfotransferase 18322Arabidopsis thalianaMutation(s): 0 
Gene Names: SOT18ST5BAt1g74090F2P9.4
EC: 2.8.2
Find proteins for Q9C9C9 (Arabidopsis thaliana)
Explore Q9C9C9 
Go to UniProtKB:  Q9C9C9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9C9C9
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on A3P

Download Ideal Coordinates CCD File 
C10 H15 N5 O10 P2
Query on EDO

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A],
S [auth A],
T [auth A],
U [auth A],
V [auth A],
W [auth A],
X [auth A]
C2 H6 O2
Query on POL

Download Ideal Coordinates CCD File 
AA [auth A],
BA [auth A],
CA [auth A],
Y [auth A],
Z [auth A]
C3 H8 O
Experimental Data & Validation

Experimental Data

  • Resolution: 1.74 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.74α = 90
b = 62.74β = 90
c = 201.5γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SADABSdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research FoundationGermanyPA 764/10-1
German Research FoundationGermanyFE 1510/2-1

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-05
    Type: Initial release
  • Version 1.1: 2017-09-06
    Changes: Author supporting evidence
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description