A comparison by magnetic circular dichroism of compound X and compound II of horseradish peroxidase

N. Foote, P.M.A. Gadsby, R.A. Field, C. Greenwood

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The chlorite product of horseradish peroxidase, compound X, is shown by magnetic circular dichroism (MCD) spectroscopy in the temperature range 1.6–50 K to have a very similar haem structure to compound II under the same conditions (pH 10.7). Both are concluded to contain the Fe(IV)=0 group. The MCD spectrum also detects an unusual species, absorbing at wavelengths between 600 and 750 nm, that has magnetic properties different from those of the ferryl haem group. It is suggested that this is a species at the same oxidation level as ferryl haem but with the porphyrin ring having suffered a one-electron oxidation, i.e. [Fe(III) P.+].
Original languageUndefined
Pages (from-to)347-350
Number of pages4
JournalFEBS Letters
Issue number2
Publication statusPublished - 1987


  • Horseradish peroxidase
  • Compound II
  • Compound X
  • Magnetic circular dichroism

Research Beacons, Institutes and Platforms

  • Manchester Institute of Biotechnology

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