Abstract:
: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.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Navarre DA,Wendehenne D,Durner J,Noad R,Klessig DFdoi
10.1104/pp.122.2.573subject
Has Abstractpub_date
2000-02-01 00:00:00pages
573-82issue
2eissn
0032-0889issn
1532-2548journal_volume
122pub_type
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