Photoinduced electron transfer from zinc myoglobin to benzoquinone studied by FT-EPR
Photoinduced electron transfer from zinc myoglobin to benzoquinone studied by FT-EPR
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FT-EPR 研究从锌肌红蛋白到苯醌的光诱导电子转移
DOI：
10.1039/a605622i
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
K. Tsukahara
中科院分区：
文献类型：
--
作者：
R. Satoh;Y. Ohba;S. Yamauchi;M. Iwaizumi;C. Kimura;K. Tsukahara
利用傅里叶变换（FT） EPR技术研究了锌取代肌红蛋白（ZnMb）到1,4-苯醌（BQ）的光诱导电子转移。卟啉阳离子和BQ阴离子自由基(BQ
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
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) 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
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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
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. 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.