Accessibility of tyrosine Y⋅Z to exogenous reductants and Mn2+ in various Photosystem II preparations
- Chroni, Stamatia
- Ghanotakis, Demetrios F.
Publication date
April 2001
DOI Publisher
Elsevier Science B.V. ISSN
0005-2728Abstract
AbstractThe reduction of tyrosine Y⋅Z by benzidine and exogenous Mn2+ was studied by kinetic EPR experiments in various Photosystem II (PSII) preparations. Using lanthanide treated PSII membranes it was demonstrated that neither the extrinsic polypeptides (17, 23 and 33 kDa) nor the Mn complex block the accessibility of Y⋅Z to exogenous reductants, such as benzidine. In addition, it was shown that in the presence of the native Mn complex exogenous Mn2+ does not reduce Y⋅Z
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