0000000000347887

AUTHOR

Bernt Krebs

showing 2 related works from this author

Purification and spectroscopic studies on catechol oxidases from Lycopus europaeus and Populus nigra: evidence for a dinuclear copper center of type …

1999

We purified two catechol oxidases from Lycopus europaeus and Populus nigra which only catalyze the oxidation of catechols to quinones without hydroxylating tyrosine. The molecular mass of the Lycopus enzyme was determined to 39,800 Da and the mass of the Populus enzyme was determined to 56,050 Da. Both catechol oxidases are inhibited by thiourea, N-phenylthiourea, dithiocarbamate, and cyanide, but show different pH behavior using catechol as substrate. Atomic absorption spectrosopic analysis found 1.5 copper atoms per protein molecule. Using EPR spectroscopy we determined 1.8 Cu per molecule catechol oxidase. Furthermore, EPR spectroscopy demonstrated that catechol oxidase is a copper enzym…

TyrosinaseCatecholschemistry.chemical_elementPhotochemistrySpectrum Analysis RamanBiochemistrylaw.inventionTreesInorganic Chemistrychemistry.chemical_compoundlawPolymer chemistryEnzyme InhibitorsElectron paramagnetic resonanceCatechol oxidaseCatecholBinding SitesCyanidesbiologyMonophenol MonooxygenaseSpectrophotometry AtomicElectron Spin Resonance SpectroscopySubstrate (chemistry)Bridging ligandHydrogen-Ion ConcentrationPlantsPhenylthioureaCopperMolecular WeightchemistryHemocyaninsbiology.proteinSpectrophotometry UltravioletOxygen bindingCatechol OxidaseCopperJournal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry
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Molekül- und kristallstruktur von hexamethylcyclo-tristannaselenan [(CH3)2SnSe]3

1978

Hexamethylcyclotristannaselenane [(CH3)2SnSe]3 forms tetragonal crystals, space groups P41212, with a  986.5(2), c  1769.7(4) pm, Z  4. The complete X-ray structural analysis (two independent determinations) shows the six-membered ring to have a twist-boat conformation similar to [(CH3)2SnS]3. The SnSe2C2 tetrahedra are only slightly distorted, the mean bond distances being SnSe 253.1 (251.7⋯254.0(4)) pm, Sn C 2.13 (2.09⋯2.17(3)) pm. Conformational details are discussed.

Inorganic ChemistryTetragonal crystal systemCrystallographyChemistryOrganic ChemistryMaterials ChemistryTetrahedronSpace groupPhysical and Theoretical ChemistryRing (chemistry)BiochemistryJournal of Organometallic Chemistry
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