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Compounds I of Catalase and Horse Radish Peroxidase: π-Cation Radicals
Open accessAbstract
Two-electron oxidation of cobaltous octaethylporphyrin [Co(II)(Et) 8 P] yields a stable π-cation radical [Co(III)(Et) 8 P] 2+. , the optical spectrum of which exhibits spectral changes dependent upon the nature of the counterion. Comparison of these spectra with those of Compounds I of horseradish peroxidase and catalase leads us to propose that these Compounds I contain a π-cation radical of the heme prosthetic group. This proposal explains the oxidation level, optical spectra, and stability of the primary compounds without recourse to properties such as stoichiometric mixtures of special porphyrins, stable Fe(V) porphyrins, or unique conformers of heme porphyrins. Explanations are advanced to account for the missing electron spin resonance signal of Compound I of horseradish peroxidase.
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Citations
Cited by
Heme Enzyme Structure and Function
Poulos, T. L. (2014) · Chemical Reviews · doi:10.1021/cr400415k · Cited by 1,443
Protein Radicals in Enzyme Catalysis
Stubbe, J., & van der Donk, W. A. (1998) · Chemical Reviews · doi:10.1021/cr9400875 · Cited by 1,377
Cuzzocrea, S., Riley, D. P., Caputi, A. P., & Salvemini, D. (2001) · Pharmacological Reviews · doi:10.1016/s0031-6997(24)01484-4 · Cited by 1,087
Heinecke, J. W., Li, W., Daehnke, H. L., & Goldstein, J. A. (1993) · Journal of Biological Chemistry · doi:10.1016/s0021-9258(18)53581-x · Cited by 485
Myeloperoxidase: a target for new drug development?
Malle, E., Furtmüller, P. G., Sattler, W., & Obinger, C. (2007) · British Journal of Pharmacology · doi:10.1038/sj.bjp.0707358 · Cited by 408
Metadata
- Authors
- Dolphin, D., Forman, A., Borg, D. C., Fajer, J., & Felton, R. H.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 1971-03
- Volume
- 68
- Issue
- 3
- Pages
- 614-618
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2167734314
- Cited by
- 414
- References
- 0
- FWCI
- 9.58
- Type
- journal article
- Language
- en
- Open access
- green
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- CoChat. (2026). Citation check: Compounds I of Catalase and Horse Radish Peroxidase: π-Cation Radicals. https://app.cochat.ai/papers/10.1073/pnas.68.3.614
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- Dolphin, D., Forman, A., Borg, D. C., Fajer, J., & Felton, R. H. (1971). Compounds I of Catalase and Horse Radish Peroxidase: π-Cation Radicals. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.68.3.614
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