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Accession number;02A0304367
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| Title;Intramolecular Electron Transfer Reaction of Myoglobin Whose N-Terminal Glycine Was Chemically Modified. |
| Author;
TSUKAHARA KEIICHI
(Nara Women's Univ., Fac. of Sci.)
NISHIMINE MARI
(Nara Women's Univ., Fac. of Sci.)
SHIOYAMA YUKA
(Nara Women's Univ., Fac. of Sci.)
TAKASHIMA HIROSHI
(Nara Women's Univ., Fac. of Sci.)
HIROSE JUNZO
(Fukuyama Univ., Fac. of Eng.)
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Journal Title;Abstracts. Symposium on Biofunctional Chemistry
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Journal Code:L0836A
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ISSN:
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VOL.16th;NO.;PAGE.22-23(2001)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Metmyoglobin whose N-terminal glycine was modified with diethylenetriaminepentaacetato-cobaltate(III)(metMb{CoIII(dtpa)}) was reduced by a methylviologen-radical cation to form deoxyMb{CoIII(dtpa)}, followed by CoIIIpetitive intramolecular electron-transfer(ET) reaction from deoxyMb to the {CoIII(dtpa)} moiety within deoxyMb{CoIII(dtpa)} and intermolecular ET reaction from deoxyMb to the {CoIII(dtpa)} moiety of metMb{CoIII(dtpa)} existing in excess. The intramolecular ET reaction was extremely slow for the long-range ET reaction of myoglobin, arising because the reorganization energy for the aminopolycarboxylatocobaltate(III) and -cobaltate(II) complexes is very large. The slow rate constant was discussed on the Marcus-Sutin equation for the distance dependence on the ET rate, which was compared with the data for zinc-substituted myoglobin modified with the {CoIII(dtpa)} complex. (author abst.) |
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