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Journal of Bacteriology, September 2005, p. 6596-6598, Vol. 187, No. 18
0021-9193/05/$08.00+0     doi:10.1128/JB.187.18.6596-6598.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Iron Starvation Leads to Oxidative Stress in Anabaena sp. Strain PCC 7120

Laboratoire de Chimie Bactérienne, IBSM-CNRS, 31 chemin Joseph Aiguier, 13402 Marseille cedex 20, France,¹ Laboratoire Adaptation et Pathogénie des Microorganismes, Université Joseph Fourier, CERMO BP53, 460, rue de la Piscine, F-38041 Grenoble cedex 9, France,² CEA/Cadarache, DEVM, DSV, Laboratoire d'Ecophysiologie de la Photosynthèse, UMR CEA-CNRS 163, Univ. Méditérranée-CEA 1000, F-13108, Saint-Paul-lez-Durance, France³

Received 31 May 2005/ Accepted 7 July 2005

We establish here that iron deficiency causes oxidative stress in the cyanobacterium Anabaena sp. strain PCC 7120. Iron starvation leads to a significant increase in reactive oxygen species, whose effect can be abolished by treatment with the antioxidant tempol (4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl). Oxidative stress induced by iron starvation could be a common feature of photosynthetic bacteria.

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