X-ray absorption studies of intermediates in peroxidase activity.
01 January 1984
The structures of the enzyme substrate compounds of peroxidase and catalase determined by X-ray absorption spectroscopy are presented. The valence state of the iron in Compounds I and II is determined from the edge to be higher than Fe(+3). A correlation is shown between the ratio of peaks in the multiple scattering region (XANES), the Fe-N(p) (heme pyrrole nitrogen) average distance and the magnetic susceptibility which provides a sensitive indicator of spin state.