5SXQ

Crystal structure of B. pseudomallei KatG with isonicotinic acid hydrazide bound


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.152 

wwPDB Validation 3D Report Full Report


This is version 1.1 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: 10.1074/jbc.M110.139428
  • Primary Citation of Related Structures:  

  • 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 th ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Catalase-peroxidase
A, B
728Burkholderia pseudomallei (strain 1710b)Mutation(s): 0 
Gene Names: katG
EC: 1.11.1.21
Find proteins for Q3JNW6 (Burkholderia pseudomallei (strain 1710b))
Go to UniProtKB:  Q3JNW6
Small Molecules
Ligands 7 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OXY
Query on OXY

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Download CCD File 
A, B
OXYGEN MOLECULE
O2
MYMOFIZGZYHOMD-UHFFFAOYSA-N
 Ligand Interaction
PO4
Query on PO4

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

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Download CCD File 
A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
NIZ
Query on NIZ

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Download CCD File 
A, B
pyridine-4-carbohydrazide
isonicotinic acid hydrazid
C6 H7 N3 O
QRXWMOHMRWLFEY-UHFFFAOYSA-N
 Ligand Interaction
HEM
Query on HEM

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Download CCD File 
A, B
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
MPD
Query on MPD

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Download CCD File 
A, B
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.152 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 100.069α = 90.00
b = 113.319β = 90.00
c = 174.640γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
MOLREPphasing
MOSFLMdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2016-08-10 
  • Released Date: 2016-08-31 
  • Deposition Author(s): Loewen, P.C.
  • This entry supersedes: 3N3N

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

Revision History 

  • Version 1.0: 2016-08-31
    Type: Initial release
  • Version 1.1: 2017-09-27
    Type: Author supporting evidence, Derived calculations, Structure summary