5SXT

Crystal structure of the S324T variant of Burkholderia pseudomallei KatG with isonicotinic acid hydrazide bound


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Isonicotinic acid hydrazide conversion to Isonicotinyl-NAD by catalase-peroxidases.

Wiseman, B.Carpena, X.Feliz, M.Donald, L.J.Pons, M.Fita, I.Loewen, P.C.

(2010) J Biol Chem 285: 26662-26673

  • DOI: https://doi.org/10.1074/jbc.M110.139428
  • Primary Citation of Related Structures:  
    5SXQ, 5SXR, 5SXS, 5SXT, 5SXW, 5SXX

  • PubMed Abstract: 

    Activation of the pro-drug isoniazid (INH) as an anti-tubercular drug in Mycobacterium tuberculosis involves its conversion to isonicotinyl-NAD, a reaction that requires the catalase-peroxidase KatG. This report shows that the reaction proceeds in the absence of KatG at a slow rate in a mixture of INH, NAD(+), Mn(2+), and O(2), and that the inclusion of KatG increases the rate by >7 times. Superoxide, generated by either Mn(2+)- or KatG-catalyzed reduction of O(2), is an essential intermediate in the reaction. Elimination of the peroxidatic process by mutation slows the rate of reaction by 60% revealing that the peroxidatic process enhances, but is not essential for isonicotinyl-NAD formation. The isonicotinyl-NAD(*+) radical is identified as a reaction intermediate, and its reduction by superoxide is proposed. Binding sites for INH and its co-substrate, NAD(+), are identified for the first time in crystal complexes of Burkholderia pseudomallei catalase-peroxidase with INH and NAD(+) grown by co-crystallization. The best defined INH binding sites were identified, one in each subunit, on the opposite side of the protein from the entrance to the heme cavity in a funnel-shaped channel. The NAD(+) binding site is approximately 20 A from the entrance to the heme cavity and involves interactions primarily with the AMP portion of the molecule in agreement with the NMR saturation transfer difference results.


  • Organizational Affiliation

    Department of Microbiology, University of Manitoba,Winnipeg, Manitoba, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Catalase-peroxidase
A, B
728Burkholderia pseudomallei 1710bMutation(s): 1 
Gene Names: katGBURPS1710b_3366
EC: 1.11.1.21
UniProt
Find proteins for Q3JNW6 (Burkholderia pseudomallei (strain 1710b))
Explore Q3JNW6 
Go to UniProtKB:  Q3JNW6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ3JNW6
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 7 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
C [auth A],
J [auth B]
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
NIZ
Query on NIZ

Download Ideal Coordinates CCD File 
I [auth A],
Q [auth B]
pyridine-4-carbohydrazide
C6 H7 N3 O
QRXWMOHMRWLFEY-UHFFFAOYSA-N
MPD
Query on MPD

Download Ideal Coordinates CCD File 
H [auth A],
P [auth B]
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
PO4
Query on PO4

Download Ideal Coordinates CCD File 
G [auth A],
O [auth B]
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
CL
Query on CL

Download Ideal Coordinates CCD File 
E [auth A],
L [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
OXY
Query on OXY

Download Ideal Coordinates CCD File 
F [auth A],
M [auth B],
N [auth B]
OXYGEN MOLECULE
O2
MYMOFIZGZYHOMD-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
D [auth A],
K [auth B]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.22α = 90
b = 112.6β = 90
c = 173.7γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data

  • Released Date: 2016-09-07 
  • Deposition Author(s): Loewen, P.C.
  • This entry supersedes: 3N3Q

Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)CanadaD9600

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-07
    Type: Initial release
  • Version 1.1: 2017-09-27
    Changes: Author supporting evidence, Derived calculations, Structure summary
  • Version 1.2: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.4: 2024-10-23
    Changes: Structure summary