Photoinduced electron transfer from zinc myoglobin to benzoquinone studied by FT-EPR

Rie Satoh, Yasunori Ohba, Seigo Yamauchi, Masamoto Iwaizumi, Chieko Kimura, Keiichi Tsukahara

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8 Citations (Scopus)


A Fourier transform (FT) EPR technique has been used to study the photoinduced electron transfer from zinc-substituted myoglobin (ZnMb) to 1,4-benzoquinone (BQ). Both porphyrin cation and BQ anion radicals (BQ-) were observed, which provide direct evidence of an electron transfer occurring between a porphyrin moiety (ZnPP) in myoglobin and BQ. Electron transfer rate constants, spin-lattice relaxation times of triplet porphyrin and BQ- and magnitudes of chemically induced dynamic electron polarization (CIDEP) due to the triplet mechanism (TM) and the radical pair mechanism (RPM) were evaluated from decay analyses of the FT-EPR signals of BQ-. These results were compared with those for a [5,10,15,20-tetrakis(4-sulfonatophenyl)porphinato]zinc(II) (ZnTPPS)-BQ system and discussed in terms of protein effects in ZnMb. We concluded that electron transfer occurs from the ZnPP moiety to BQ which is located at the surface of myoglobin.

Original languageEnglish
Pages (from-to)537-544
Number of pages8
JournalJournal of the Chemical Society - Faraday Transactions
Issue number4
Publication statusPublished - 1997 Feb 21

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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