Two interconvertible structures that explain the spectroscopic properties of the oxygen-evolving complex of photosystem II in the S2 state.
Using models derived from the X-ray structure of photosystem II, it is shown that the oxygen evolving complex in the S(2) state exists in two energetically similar and interconvertible forms. A longstanding question regarding the spectroscopy of the catalyst is thus answered: one form corresponds to the multiline g=2.0 EPR signal (see picture, right; O red, Mn purple, Ca yellow), and the other to the g≥4.1 signals (left).
Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany. dimitrios.pantazis@cec.mpg.de
Dimitrios A
DA
Pantazis
William
W
Ames
Nicholas
N
Cox
Wolfgang
W
Lubitz
Frank
F
Neese