Long-range electron transfer from iron(II)-cytochrome c to (zinc-cytochrome c peroxidase)(+) within the 1:1 complex Academic Article uri icon

abstract

  • Long-range electron transfer within crystallographically defined protein complexes can be studied by substituting zinc protoporphyrin IX for heme in one partner. Electron transfer within such a complex is initiated by flash photoproduction of the zinc protoporphyrin triplet state (3ZnP), which either can decay back to the ground state or can reduce a ferriheme partner, The redox intermediate B returns to the ground state by thermal electron transfer from Fe11P to the cation radical ZnP.+, Until now, reaction 2 has not been observed directly. This report demonstrates the process in the archetypical 1:1 protein electron transfer complex between yeast cytochrome c peroxidase (CcP) and cytochrome c (Cc) and shows that it exhibits a much more pronounced dependence on the cytochrome c employed than does the photostimulated, forward reaction. It is noteworthy that in this case the thermal reaction (2) is equivalent to the physiological oxidation of Fe11Cc by the H2O2-oxidized enzyme. © 1986, American Chemical Society. All rights reserved.

published proceedings

  • Journal of the American Chemical Society

author list (cited authors)

  • Liang, N., Kang, C. H., Margoliash, E., Ho, P. S., & Hoffman, B. M

citation count

  • 35

complete list of authors

  • Liang, Nong||Kang, Chae Hee||Margoliash, E||Ho, Pui Shing||Hoffman, Brian M

publication date

  • July 1986