Identification of a nitrate-responsive cis-element in the Arabidopsis NIR1 promoter defines the presence of multiple cis-regulatory elements for nitrogen response.
Nitrate is a major nitrogen source for land plants and also acts as a signaling molecule that induces changes in growth and gene expression. To identify the cis-acting DNA element involved in nitrate-responsive gene expression, we analyzed the promoter of the Arabidopsis gene encoding nitrite reductase (NIR1). A region from positions -188 to -1, relative to the translation start site, was found to contain at least one cis-element necessary for the nitrate-dependent activation of the promoter, in which the activity of nitrate transporter NRT2.1 and/or NRT2.2 plays a critical role. To define this nitrate-responsive cis-element (NRE), we compared the sequences of several nitrite reductase gene promoters from various higher plants and identified a conserved sequence motif as the putative NRE. A synthetic promoter in which the four copies of a 43-bp sequence containing the motif were fused to the 35S minimal promoter was found to direct nitrate-responsive transcription. Furthermore, mutations within this conserved motif in the native NIR1 promoter markedly reduced the nitrate-responsive activity of the promoter, indicating that the 43-bp sequence is an NRE that is both necessary and sufficient for nitrate-responsive transcription. We also show that both the native NIR1 promoter and the synthetic promoter display a similar level of sensitivity to nitrate, but respond differentially to exogenously supplied glutamine, indicating independent modulation of NIR1 expression by NRE-mediated nitrate induction and feedback repression mediated by other cis-element(s). These findings thus define the presence of multiple cis-elements involved in the nitrogen response in Arabidopsis.
Konishi
Mineko
M
Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.|Research Fellow of the Japan Society for the Promotion of Science, Tiyoda-ku, Tokyo 102-8471, Japan.
Yanagisawa
Shuichi
S
Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan.|The Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan.
D017360:Arabidopsis / Q000201:enzymology / Q000235:genetics*; D001483:Base Sequence; D018506:Gene Expression Regulation, Plant; D005973:Glutamine / Q000378:metabolism; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D009154:Mutation; D009566:Nitrates / Q000378:metabolism*; D009572:Nitrite Reductases / Q000235:genetics* / Q000378:metabolism; D011401:Promoter Regions, Genetic; D018749:RNA, Plant / Q000235:genetics; D017384:Sequence Deletion; D014158:Transcription, Genetic
D009566:Nitrates; D018749:RNA, Plant; D005973:Glutamine; D009572:Nitrite Reductases
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