Journal of Photoscience

Korean Society of Photoscience (한국광과학회)
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Photoinduced Electron Tansfer of Microperoxidase-8

  • Su, Chien-Hua (China Institute of Technology and Commerce) ;
  • Lin, Ren-Jay (Dept. of Chemistry, National Taiwan Normal Univ.) ;
  • Chang, I-Jy (Dept. of Chemistry, National Taiwan Normal Univ.)
  • Published : 1999.05.01
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Abstract

Microperoxidase 8 (MP8) has been prepared by sequential hydrolysis of cytochrome C by pepsin and trypsin. This five-coordinated heme-octapetide fragment provides a uniques structure to evaluate the electronic coupling efficiency to the iron through axial position and porphyrin edge. At alkali pH, Ru(bpy)2(im)22+ is completely quenched in AcMP8Ru complex . Transient kinetics measurement showed the decay rate to be ~1 $\times$1012S-1. Ruthenium bipyridine complex with a carboxyl group substituted bipyridine has been prepared adn reacted with MR 8 to yield N-terminus bound RuMP8 complex. The luminescence decay rate has been measured as 1 $\times$109S-1. By using semiclassical electron transfer theory, we found the electron transfer efficiency through axial positioin of iron prophyrin is as good through prophyrin edge.

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References

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