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Plant Physiology 122 (2): 573-582

Copyright © 2000 by the American Society of Plant Physiologists.

Plant Physiol, February 2000, Vol. 122, pp. 573-582

Nitric Oxide Modulates the Activity of Tobacco Aconitase1

Duroy A. Navarre, David Wendehenne,2 Jörg Durner,3 Robert Noad, and Daniel F. Klessig*

Waksman Institute and Department of Molecular Biology and Biochemistry, Rutgers, the State University of New Jersey, 190 Frelinghuysen Road, Piscataway, New Jersey 08854-8020.

Recent evidence suggests an important role for nitric oxide (NO) signaling in plant-pathogen interactions. Additional elucidation of the role of NO in plants will require identification of NO targets. Since aconitases are major NO targets in animals, we examined the effect of NO on tobacco (Nicotiana tabacum) aconitase. The tobacco aconitases, like their animal counterparts, were inhibited by NO donors. The cytosolic aconitase in animals, in addition to being a key redox and NO sensor, is converted by NO into an mRNA binding protein (IRP, or iron-regulatory protein) that regulates iron homeostasis. A tobacco cytosolic aconitase gene (NtACO1) whose deduced amino acid sequence shared 61% identity and 76% similarity with the human IRP-1 was cloned. Furthermore, residues involved in mRNA binding by IRP-1 were conserved in NtACO1. These results reveal additional similarities between the NO signaling mechanisms used by plants and animals.

1 This work was supported by the National Science Foundation (grant nos. MCB 9723952 and MCB 9514239).

2 Present address: Unité associée Institut National de la Recherche Agronomique/Université de Bourgogne, Institut National de la Recherche Agronomique AV 1540, 21034 Dijon cedex, France.

3 Present address: Institute of Biochemical Plant Pathology, GSF-National Research Center for Environment & Health, D-85764, Oberschleissheim, Germany.

* Corresponding author; e-mail klessig{at}; fax 732-445-5735.

© 2000 American Society of Plant Physiologists

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