S. Chroni et Df. Ghanotakis, Accessibility of tyrosine Y-Z(.) to exogenous reductants and Mn2+ in various Photosystem II preparations, BBA-BIOENER, 1504(2-3), 2001, pp. 432-437
The reduction of tyrosine Y-Z(.) by benzidine and exogenous Mn2+ was studie
d by kinetic EPR experiments in various Photosystem II (PSII) preparations.
Using lanthanide treated PSII membranes it was demonstrated that neither t
he extrinsic polypeptides (17, 23 and 33 kDa) nor the Mn complex block the
accessibility of Y-Z(.) to exogenous reductants, such as benzidine. In addi
tion, it was shown that in the presence of the native Mn complex exogenous
Mn2+ does not reduce Y-Z(.). (C) 2001 Elsevier Science B.V. All rights rese
rved.