Quinone Binding and Herbicide Activity in the Acceptor Quinone Complex of Bacterial Reaction Centres

  • Colin A. Wraight
  • Robert J. Shopes
Part of the NATO ASI Series book series (NSSA, volume 168)


The electron acceptor function of bacterial reaction centres is carried out by two quinones, QAand QB, which function in series to provide a unique, two-electron gate that releases reducing equivalents only in pairs. In a series of flashes, the quinones undergo reduction and oxidation as follows [1]:
$$ \begin{array}{l} Odd{\kern 1pt} flashes:\quad {Q_{A}}{Q_{B}}{Q_{A}}\overline {} {Q_{B}}{Q_{A}}{Q_{B}}\overline {} \left( {{H^{ + }}} \right)\;\left( {stable} \right) \\ Even\;flashes:\quad {Q_{A}}{Q_{B}}\overline {} \left( {{H^{ + }}} \right){Q_{A}}\overline {} {Q_{B}}\overline {} \left( {{H^{ + }}} \right){Q_{A}}{Q_{B}}{H_{2}}{Q_{A}}{Q_{B}} \\ \end{array} $$
(The photooxidized donor, P+, is rereduced after each flash, by a secondary donor — a c-type cytochrome, in vivo— and is omitted). A very similar electron acceptor activity is observed in PS II of plants and algae.


Tertiary Butyl Herbicide Activity Midpoint Potential Bacterial Reaction Centre Secondary Quinone 
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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Colin A. Wraight
    • 1
  • Robert J. Shopes
    • 1
  1. 1.Department of Physiology and BiophysicsUniversity of IllinoisUrbanaUSA

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