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Plant and Cell Physiology Advance Access published online on March 15, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci088
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received January 7, 2005
Accepted March 11, 2005

Regular Paper

Near-Infrared-Induced Transitions in the Manganese Cluster of Photosystem II: Action Spectra for the S2 and S3 Redox States

Alain Boussac 1*, Miwa Sugiura 2, Diana Kirilovsky 1, and A. William Rutherford 1

1 Service de Bioénergétique, DBJC, URA CNRS 2096, CEA Saclay, 91191 Gif-sur-Yvette, France
2 Department of Applied Biological Chemistry, Faculty of Agriculture, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan

* To whom correspondence should be addressed.
Alain Boussac, E-mail: alain.boussac{at}cea.fr


  Abstract

The Mn4Ca complex that is involved in water oxidation in photosystem II (PSII) is affected by near infra-red (NIR) light in certain redox states and these phenomena can be monitored by EPR at low temperature. Here we report the action spectra of the NIR effects in the S2- and S3-states in PSII from plants and the thermophilic cyanobacterium Thermosynechococcus elongatus. The action spectra obtained are very similar in both S-states, indicating the presence of the same photoactive form of the Mn4Ca complex in both states. Since the chemical nature of the photoactive species is not known, an unequivocal interpretation of this result cannot be made, however it appears to be more easily reconciled with the view that the redox state of the Mn4Ca cluster does not change from the S2 to the S3 transition, at least in those centers sensitive to NIR light. The temperature dependence of the NIR effect and the action spectra for S2 indicates the presence of structural heterogeneity in the Mn4Ca cluster.

Keywords: Photosystem II; Manganese; near-infrared; EPR.
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