alexa A novel iron-regulated metal transporter from plants identified by functional expression in yeast.
Bioinformatics & Systems Biology

Bioinformatics & Systems Biology

Transcriptomics: Open Access

Author(s): Eide D, Broderius M, Fett J, Guerinot ML, Eide D, Broderius M, Fett J, Guerinot ML

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Abstract Iron is an essential nutrient for virtually all organisms. The IRT1 (iron-regulated transporter) gene of the plant Arabidopsis thaliana, encoding a probable Fe(II) transporter, was cloned by functional expression in a yeast strain defective for iron uptake. Yeast expressing IRT1 possess a novel Fe(II) uptake activity that is strongly inhibited by Cd. IRT1 is predicted to be an integral membrane protein with a metal-binding domain. Data base comparisons and Southern blot analysis indicated that IRT1 is a member of a gene family in Arabidopsis. Related sequences were also found in the genomes of rice, yeast, nematodes, and humans. In Arabidopsis, IRT1 is expressed in roots, is induced by iron deficiency, and has altered regulation in plant lines bearing mutations that affect the iron uptake system. These results provide the first molecular insight into iron transport by plants.
This article was published in Proc Natl Acad Sci U S A and referenced in Transcriptomics: Open Access

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