0000000000587830

AUTHOR

Ewald Schröder

showing 3 related works from this author

Formation, TEM study and 3D reconstruction of the human erythrocyte peroxiredoxin-2 dodecahedral higher-order assembly.

2004

The production of a higher-order assembly of peroxiredoxin-2 (Prx-2) from human erythrocytes has been achieved during specimen preparation on holey carbon support films, in the presence of ammonium molybdate and polyethylene glycol. TEM study suggested that this assembly is a regular dodecahedron, containing 12 Prx-2 decamers (Mr 2.62 MDa, external diameter approximately 20 nm). This interpretation has been supported by production of a approximately 1.6 nm 3D reconstruction from the negative stain TEM data, with automated docking of the available X-ray data of the Prx-2 decamer. Comparison with other known protein dodecahedral and viral icosahedral structures indicates that this arrangement…

Models MolecularMaterials scienceErythrocytesIcosahedral symmetryMacromolecular SubstancesMacromolecular SubstancesGeneral Physics and AstronomyCell BiologyPeroxiredoxin 2Polyethylene glycolPeroxiredoxinsNegative stainDodecahedronCrystallographychemistry.chemical_compoundProtein structurechemistryMicroscopy Electron TransmissionPeroxidasesStructural BiologyImage Processing Computer-AssistedHumansGeneral Materials ScienceProtein Structure QuaternaryMacromoleculeMicron (Oxford, England : 1993)
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Structure, mechanism and regulation of peroxiredoxins.

2003

Peroxiredoxins (Prxs) are a ubiquitous family of antioxidant enzymes that also control cytokine-induced peroxide levels which mediate signal transduction in mammalian cells. Prxs can be regulated by changes to phosphorylation, redox and possibly oligomerization states. Prxs are divided into three classes: typical 2-Cys Prxs; atypical 2-Cys Prxs; and 1-Cys Prxs. All Prxs share the same basic catalytic mechanism, in which an active-site cysteine (the peroxidatic cysteine) is oxidized to a sulfenic acid by the peroxide substrate. The recycling of the sulfenic acid back to a thiol is what distinguishes the three enzyme classes. Using crystal structures, a detailed catalytic cycle has been deriv…

Peroxiredoxin-4Binding SitesChemistryProtein ConformationPeroxiredoxin IIIPeroxiredoxin 2PeroxiredoxinsBiochemistryCatalysischemistry.chemical_compoundSulfiredoxinCatalytic cycleBiochemistryPeroxidasesSulfenic acidPeroxiredoxinMolecular BiologyDimerizationOxidation-ReductionCysteineTrends in biochemical sciences
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Comparison of the decameric structure of peroxiredoxin-II by transmission electron microscopy and X-ray crystallography

2001

Abstract The decameric human erythrocyte protein torin is identical to the thiol-specific antioxidant protein-II (TSA-II), also termed peroxiredoxin-II (Prx-II). Single particle analysis from electron micrographs of Prx-II molecules homogeneously orientated across holes in the presence of a thin film of ammonium molybdate and trehalose has facilitated the production of a ≥20 A 3-D reconstruction by angular reconstitution that emphasises the D5 symmetry of the ring-like decamer. The X-ray structure for Prx-II was fitted into the transmission electron microscopic reconstruction by molecular replacement. The surface-rendered transmission electron microscopy (TEM) reconstruction correlates well…

Models MolecularMolybdenumErythrocytesSurface PropertiesCryo-electron microscopyChemistryResolution (electron density)BiophysicsTrehaloseSingle particle analysisPeroxiredoxinsCrystallography X-RayBiochemistryNegative stainMicroscopy ElectronCrystallographyPeroxidasesElectron tomographyStructural BiologyTransmission electron microscopyHumansEnergy filtered transmission electron microscopyOrthorhombic crystal systemMolecular BiologyBiochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology
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