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Functional characterization of NRAMP3 and NRAMP4 from the metal hyperaccumulator Thlaspi caerulescens Inra
Oomen, R.; Wu, J.; Lilièvre, F.; Blanchet, S.; Richaud, P.; Barbier-Brygoo, H.; Aarts, M. G. M.; Thomine, S..
The ability of metal hyperaccumulating plants to tolerate and accumulate heavy metals results from adaptations of metal homeostasis. NRAMP metal transporters were found to be highly expressed in some hyperaccumulating plant species. Here, we identified TcNRAMP3 and TcNRAMP4, the closest homologues to AtNRAMP3 and AtNRAMP4 in Thlaspi caerulescens and characterized them by expression analysis, confocal imaging and heterologous expression in yeast and Arabidopsis thaliana. TcNRAMP3 and TcNRAMP4 are expressed at higher levels than their A. thaliana homologues. When expressed in yeast TcNRAMP3 and TcNRAMP4 transport the same metals as their respective A. thaliana orthologues: iron (Fe), manganese (Mn) and cadmium (Cd) but not zinc (Zn) for NRAMP3; Fe, Mn, Cd...
Tipo: Journal Article Palavras-chave: CADMIUM; HYPERACCULULATOR; METAL TRANSPORT; NRAMP; THLASPI CAERULESCENS; ZINC.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20109c2f089f&uri=/notices/prodinra1/2010/12/
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Nicotianamine over-accumulation confers resistance to nickel in Arabidopsis thaliana Inra
Pianelli, K.; Mari, S.; Marques, L.; Lebrun, M.; Czernic, P..
Nicotianamine is a methionine derivative involved in iron homeostasis, able to bind various other metals in vitro. To investigate its role in vivo, we expressed a nicotianamine synthase cDNA (TcNAS1) isolated from the polymetallic hyperaccumulator Thlaspi caerulescens in Arabidopsis thaliana. Transgenic plants expressing TcNAS1 over-accumulated NA, up to 100-fold more than wild type plants. Furthermore, increased NA levels in different transgenic lines were quantitatively correlated with increased nickel tolerance. The tolerance to nickel is expressed at the cellular level in protoplast experiments and is associated with an increased NA content. We have also shown that the most NA-over accumulating line showed a high tolerance to nickel and a significant...
Tipo: Journal Article Palavras-chave: BIOREMEDIATION; BIODECONTAMINATION; RESILIENCE NICOTIANAMINE; NICKEL RESISTANCE; PHYTOREMEDIATION; THLASPI CAERULESCENS; POLYMETALLIC HYPERACCUMULATOR.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20072904f103&uri=/notices/prodinra1/2007/02/
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