Characterization of neutrophil b-type cytochrome in situ by electron paramagnetic resonance spectroscopy. |
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| Authors: | I Ueno S Fujii H Ohya-Nishiguchi T Iizuka S Kanegasaki |
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| Affiliation: | Institute of Medical Science, University of Tokyo, Japan. |
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| Abstract: | Electron paramagnetic resonance spectroscopy at 4.2 K was successfully used to characterize neutrophil b-type cytochrome in situ. The spectra of resting neutrophils taken under aerobic conditions gave a set of characteristic signals in a high magnetic field (g = 2.85, 2.21 and 1.67) beside signals for myeloperoxidase and others. From the g values, shapes and the results of other experiments, these signals were attributed to those of cytochrome b558. The results indicate that cytochrome b558 in resting neutrophils is a hexa-coordinated ferric hemoprotein in a low-spin state. The obtained gz and gx values for the hemichrome were consistent with that of bis(imidazole)-coordinated hemoprotein. |
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