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J. Biol. Chem., Vol. 276, Issue 8, 5584-5590, February 23, 2001
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From the Laboratoire de Biochimie et Physiologie Moléculaire
des Plantes, CNRS UMR 5004, Agro-M/INRA, 34060 Montpellier Cedex 1, France
In eukaryotic cells, ferritin synthesis is
controlled by the intracellular iron status. In mammalian cells, iron
derepresses ferritin mRNA translation, whereas it induces ferritin
gene transcription in plants. Promoter deletion and site-directed
mutagenesis analysis, combined with gel shift assays, has allowed
identification of a new cis-regulatory element in the
promoter region of the ZmFer1 maize ferritin gene. This
Iron-Dependent Regulatory Sequence (IDRS) is responsible for
transcriptional repression of ZmFer1 under low iron supply
conditions. The IDRS is specific to the ZmFer1 iron-dependent regulation and does not mediate the
antioxidant response that we have previously reported (Savino et
al. (1997) J. Biol. Chem. 272, 33319-33326). In
addition, we have cloned AtFer1, the Arabidopsis
thaliana ZmFer1 orthologue. The IDRS element is conserved in the
AtFer1 promoter region and is functional as shown by
transient assay in A. thaliana cells and stable
transformation in A. thaliana transgenic plants,
demonstrating its ubiquity in the plant kingdom.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AF229850.
Characterization of an Iron-dependent Regulatory
Sequence Involved in the Transcriptional Control of AtFer1
and ZmFer1 Plant Ferritin Genes by Iron*
,
*
This work was supported by the CNRS (Program Biologie
Cellulaire: du Normal au Pathologique Grant 96003).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Present address: Génétique Moléculaire des
Plantes, Université de Picardie Jules Verne, 80039 Amiens
Cédex, France.
§
To whom correspondence should be addressed: Tel.: 33-4-9961-2323;
Fax: 33-4-6752-5737; E-mail: lobreaux@ensam.inra.fr.
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