ISSN:
1573-5079
Keywords:
Key words
;
Photosystem 2
;
oxygen evolution
;
Mn cluster
;
o-phenanthroline
;
LiClO4
;
electron transport
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract We examined the effects of o-phenanthroline and LiClO4 on oxygen evolution and electron transport in the Photosystem 2 complex of the pea. Treatment of Photosystem 2 particles with a combination of 3.0 mM o-phenanthroline and 1.0 M LiClO4 for 30–40 min at 0°C decreased the oxygen-evolving activity with the electron acceptor (either phenyl-p-benzoquinone or 2,6-dichlorophenol indophenol) to less than 5% of the original level. However with the same treatment, the electron-transport activity from an artificial electron donor, 1,5-diphenylcarbohydrazide, to 2,6-dichlorophenol indophenol remained at 60% of the original activity. The amount of manganese in the Photosystem 2 complex decreased in parallel with the loss of oxygen evolution following treatment. These observations suggest that the treatment of the Photosystem 2 complex with o-phenanthroline and LiClO4 inhibits electron transport on the oxygen-evolving side much more significantly than on the electron-acceptor side.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00016564
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