Journal Article

ClpC1, an ATP-dependent Clp protease in plastids, is involved in iron homeostasis in <i>Arabidopsis</i> leaves

Huilan Wu, Yanyan Ji, Juan Du, Danyu Kong, Hui Liang and Hong-Qing Ling

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 105, issue 5, pages 823-833
Published in print May 2010 | ISSN: 0305-7364
Published online April 2010 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcq051
ClpC1, an ATP-dependent Clp protease in plastids, is involved in iron homeostasis in Arabidopsis leaves

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  • Ecology and Conservation
  • Evolutionary Biology
  • Plant Sciences and Forestry

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Background and Aims

Iron (Fe) is necessary for plant growth and development. Although it is well known that Fe deficiency causes chlorosis in plants, it remains unclear how the Fe homeostasis is regulated in mesophyll cells. The aim of this work was to identify a gene related to Fe homeostasis in leaves.

Methods

A spontaneous mutant irm1, which revealed typical Fe-deficiency chlorosis, was found from Arabidopsis thaliana. Using map-based cloning, the gene responsible for the altered phenotype of irm1 was cloned. The expression of genes was analysed using northern blot hybridization and multiplex RT-PCR analysis. Further, GUS staining with transgenic promoter-GUS lines and transient expression of the fusion protein with GFP were used for detecting the expression pattern of the gene in different tissues and at different developmental stages, and for the subcelluar localization of the gene product.

Key Results

A point mutation from G to A at nucleotide 2317 of ClpC1 on chromosome V of Arabidopsis is responsible for the irm1 phenotype. The leaf chlorosis of the mutant irm1 and clpc1 (a T-DNA-inserted null mutant of ClpC1) could be converted to green by watering the soil with Fe solution. The expression intensity of ferric reductase FRO8 in irm1 and clpc1 was disordered (significantly higher than that of wild type).

Conclusions

The glycine residue at amino acid 773 of ClpC1 is essential for its functions. In addition to its known functions reported previously, ClpC1 is involved in leaf Fe homeostasis, presumably via chloroplast translocation of some nuclear-encoded proteins which function in Fe transport.

Keywords: Arabidopsis; ClpC1; iron homeostasis; chloroplasts; Clp protease

Journal Article.  6189 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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