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Browsing by Subject "Paracoccus denitrificans"

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    • Article  

      Direct detection of Fe(IV)=O intermediates in the cytochrome aa3 oxidase from Paracoccus denitrificans[H2O2 reaction 

      Pinakoulaki, Eftychia; Pfitzner, U.; Ludwig, B.; Varotsis, Constantinos (2003)
      We report the first evidence for the formation of the "607- and 580-nm forms" in the cytochrome oxidase aa3/H2O2 reaction without the involvement of tyrosine 280. The pKa of the 607-580-nm transition is 7.5. The 607-nm ...

    • Article  

      Nitric-oxide reductase: Structure and properties of the catalytic site from resonance Raman scattering 

      Pinakoulaki, Eftychia; Gemeinhardt, S.; Saraste, M.; Varotsis, Constantinos (2002)
      We have applied resonance Raman spectroscopy to investigate the properties of the dinuclear center of oxidized, reduced, and NO-bound nitric-oxide reductase from Paracoccus denitrificans. The spectra of the oxidized enzyme ...

    • Article  

      The protein effect in the structure of two ferryl-oxo intermediates at the same oxidation level in the heme copper binuclear center of cytochrome c oxidase 

      Pinakoulaki, Eftychia; Daskalakis, Vangelis; Ohta, T.; Richter, O. -M H.; Budiman, K.; Kitagawa, T.; Ludwig, B.; Varotsis, Constantinos (2013)
      Identification of the intermediates and determination of their structures in the reduction of dioxygen to water by cytochrome c oxidase (CcO) are particularly important to understanding both O2 activation and proton pumping ...

    • Article  

      Resonance raman spectroscopy of nitric oxide reductase and cbb3 Heme-Copper oxidase 

      Pinakoulaki, Eftychia; Varotsis, Constantinos (2008)
      Elucidating the structure and properties of the active sites in cbf 3 heme-copper oxidase and in nitric oxide reductase (Nor) is crucial in understanding the reaction mechanisms of oxygen and nitric oxide reduction by both ...

    • Article  

      The role of the cross-link His-Tyr in the functional properties of the binuclear center in cytochrome c oxidase 

      Pinakoulaki, Eftychia; Pfitzner, U.; Ludwig, B.; Varotsis, Constantinos (2002)
      Resonance Raman and Fourier transform infrared spectroscopies have been used to study the aa3-type cytochrome c oxidase and the Y280H mutant from Paracoccus denitrificans. The stability of the binuclear center in the absence ...

    • Article  

      Time-Resolved Resonance Raman and Time-Resolved Step-Scan FTIR Studies of Nitric Oxide Reductase from Paracoccus denitrificans: Comparison of the Heme b3-FeB Site to That of the Heme-CuB in Oxidases 

      Pinakoulaki, Eftychia; Varotsis, Constantinos (2003)
      Time-resolved resonance Raman (TR3) and time-resolved step-scan (TRS2) FTIR spectroscopies have been used to probe the structural dynamics at the heme b3 proximal and distal sites after carbon monoxide photolysis from fully ...

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