9IGK | pdb_00009igk

Crystal structure of P. syringae phosphinothricin acetyltransferase PSPTO_3321


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 
    0.209 (Depositor), 0.210 (DCC) 
  • R-Value Work: 
    0.187 (Depositor), 0.187 (DCC) 
  • R-Value Observed: 
    0.188 (Depositor) 

Starting Model: experimental
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Literature

Structure and activity of a phosphinothricin N-acetyltransferase (PSPTO_3321) from Pseudomonas syringae pv. tomato DC3000.

Davies, A.M.Trentham, D.Sutton, B.J.Brown, P.R.

(2025) Biochem Biophys Res Commun 755: 151539-151539

  • DOI: https://doi.org/10.1016/j.bbrc.2025.151539
  • Primary Citation of Related Structures:  
    9IGK, 9IGL

  • PubMed Abstract: 

    Phosphinothricin inhibits plant glutamine synthetase and is used as a herbicide. Streptomyces hygroscopicus and Streptomyces viridochromogenes, which produce phosphinothricin naturally, encode acetyltransferases that confer phosphinothricin resistance. In the Pseudomonas genome database, a number of proteins have been annotated as phosphinothricin acetyltransferases and putative phosphinothricin acetyltransferases. One such protein is PSPTO_3321 from P. syringae, a strain that causes tomato speck. Here, we reveal that PSPTO_3321 from P. syringae, termed syr_pat, is a phosphinothricin acetyltransferase, and also retains a lower level of activity against the structurally similar substrate methionine sulfoximine. We solved a 1.6 Å resolution crystal structure of syr_pat alone and a 2.5 Å resolution structure for a complex with L -phosphinothricin. We also characterised active site mutants, providing insights into substrate specificity. Our work now provides a basis for further study of the reaction mechanism.


  • Organizational Affiliation

    King's College London, Randall Centre for Cell and Molecular Biophysics, New Hunt's House, London, SE1 1UL, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phosphinothricin N-acetyltransferase
A, B, C, D
179Pseudomonas syringae pv. tomato str. DC3000Mutation(s): 0 
Gene Names: barPSPTO_3321
UniProt
Find proteins for Q87ZV1 (Pseudomonas syringae pv. tomato (strain ATCC BAA-871 / DC3000))
Explore Q87ZV1 
Go to UniProtKB:  Q87ZV1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ87ZV1
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
I [auth B]
J [auth B]
M [auth C]
E [auth A],
F [auth A],
I [auth B],
J [auth B],
M [auth C],
P [auth D],
Q [auth D]
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
PGE
Query on PGE

Download Ideal Coordinates CCD File 
N [auth C]TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
PEG
Query on PEG

Download Ideal Coordinates CCD File 
G [auth A],
K [auth B],
R [auth D]
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
H [auth A],
L [auth B],
O [auth C]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free:  0.209 (Depositor), 0.210 (DCC) 
  • R-Value Work:  0.187 (Depositor), 0.187 (DCC) 
  • R-Value Observed: 0.188 (Depositor) 
Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.524α = 90
b = 137.666β = 90
c = 61.903γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
DIALSdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2025-03-12
    Type: Initial release
  • Version 1.1: 2025-03-19
    Changes: Database references