3ZS0

Human Myeloperoxidase inactivated by TX2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 

wwPDB Validation   3D Report Full Report



Literature

2-Thioxanthines are Mechanism-Based Inactivators of Myeloperoxidase that Block Oxidative Stress During Inflammation.

Tiden, A.K.Sjogren, T.Svensson, M.Bernlind, A.Senthilmohan, R.Auchere, F.Norman, H.Markgren, P.O.Gustavsson, S.Schmidt, S.Lundquist, S.Forbes, L.V.Magon, N.J.Paton, L.N.Jameson, G.N.Eriksson, H.Kettle, A.J.

(2011) J Biol Chem 286: 37578

  • DOI: 10.1074/jbc.M111.266981
  • Primary Citation of Related Structures:  
    3ZS0, 3ZS1

  • PubMed Abstract: 
  • Myeloperoxidase (MPO) is a prime candidate for promoting oxidative stress during inflammation. This abundant enzyme of neutrophils uses hydrogen peroxide to oxidize chloride to highly reactive and toxic chlorine bleach. We have identified 2-thioxanth ...

    Myeloperoxidase (MPO) is a prime candidate for promoting oxidative stress during inflammation. This abundant enzyme of neutrophils uses hydrogen peroxide to oxidize chloride to highly reactive and toxic chlorine bleach. We have identified 2-thioxanthines as potent mechanism-based inactivators of MPO. Mass spectrometry and x-ray crystal structures revealed that these inhibitors become covalently attached to the heme prosthetic groups of the enzyme. We propose a mechanism whereby 2-thioxanthines are oxidized, and their incipient free radicals react with the heme groups of the enzyme before they can exit the active site. 2-Thioxanthines inhibited MPO in plasma and decreased protein chlorination in a mouse model of peritonitis. They slowed but did not prevent neutrophils from killing bacteria and were poor inhibitors of thyroid peroxidase. Our study shows that MPO is susceptible to the free radicals it generates, and this Achilles' heel of the enzyme can be exploited to block oxidative stress during inflammation.


    Organizational Affiliation

    AstraZeneca R&D, Södertälje SE-151 85, Sweden.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MYELOPEROXIDASE LIGHT CHAINAB108Homo sapiensMutation(s): 0 
Gene Names: MPO
EC: 1.11.2.2
Find proteins for P05164 (Homo sapiens)
Explore P05164 
Go to UniProtKB:  P05164
NIH Common Fund Data Resources
PHAROS  P05164
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MYELOPEROXIDASE HEAVY CHAINCD467Homo sapiensMutation(s): 0 
Gene Names: MPO
EC: 1.11.2.2
Find proteins for P05164 (Homo sapiens)
Explore P05164 
Go to UniProtKB:  P05164
NIH Common Fund Data Resources
PHAROS  P05164
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 3
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
E
6 N-Glycosylation Oligosaccharides Interaction
Entity ID: 4
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
F
5 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 7 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download CCD File 
C, D
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
ZS0
Query on ZS0

Download CCD File 
C, D
3-(4-FLUOROBENZYL)-2-THIOXO-1,2,3,7-TETRAHYDRO-6H-PURIN-6-ONE
C12 H9 F N4 O S
GMNQNGTVFNOHLD-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download CCD File 
C, D
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
B, C
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
ACT
Query on ACT

Download CCD File 
C, D
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

Download CCD File 
C, D
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download CCD File 
C, D
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CSO
Query on CSO
C,DL-PEPTIDE LINKINGC3 H7 N O3 SCYS
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
ZS0IC50 :  200   nM  PDBBind
ZS0IC50:  200   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.905α = 90
b = 64.111β = 97.12
c = 111.452γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Revision History 

  • Version 1.0: 2011-08-31
    Type: Initial release
  • Version 1.1: 2012-08-15
    Changes: Database references
  • Version 1.2: 2012-08-29
    Changes: Atomic model, Derived calculations, Other
  • Version 1.3: 2015-01-21
    Changes: Atomic model, Derived calculations, Non-polymer description, Other
  • Version 1.4: 2018-01-17
    Changes: Data collection
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary