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dc.contributor.authorGuo, Yan-
dc.contributor.authorQiu, Quan-Sheng-
dc.contributor.authorQuintero, Francisco J.-
dc.contributor.authorPardo, José M.-
dc.contributor.authorOhta, Masaru-
dc.contributor.authorZhang, Changqing-
dc.contributor.authorSchumaker, Karen S.-
dc.contributor.authorJian-Kang, Zhu-
dc.date.accessioned2008-03-27T13:34:15Z-
dc.date.available2008-03-27T13:34:15Z-
dc.date.issued2006-07-27-
dc.identifier.citationPlant Cell 16(2): 435–449 (2004).en_US
dc.identifier.issn1040-4651-
dc.identifier.urihttp://hdl.handle.net/10261/3339-
dc.descriptionFecha de solicitud: 24-01-2006.- Titulares: Consejo Superior de Investigaciones Científicas (CSIC).- The Arizona Board of Regents on Behalf of the University of Arizona.-
dc.description.abstractIn Arabidopsis thaliana, the calcium binding protein Salt Overly Sensitive3 (SOS3) interacts with and activates the protein kinase SOS2, which in turn activates the plasma membrane Na1/H1 antiporter SOS1 to bring about sodium ion homeostasis and salt tolerance. Constitutively active alleles of SOS2 can be constructed in vitro by changing Thr168 to Asp in the activation loop of the kinase catalytic domain and/or by removing the autoinhibitory FISL motif from the C-terminal regulatory domain. We expressed various activated forms of SOS2 in Saccharomyces cerevisiae (yeast) and in A. thaliana and evaluated the salt tolerance of the transgenic organisms. Experiments in which the activated SOS2 alleles were coexpressed with SOS1 in S. cerevisiae showed that the kinase activity of SOS2 is partially sufficient for SOS1 activation in vivo, and higher kinase activity leads to greater SOS1 activation. Coexpression of SOS3 with SOS2 forms that retained the FISL motif resulted in more dramatic increases in salt tolerance. In planta assays showed that the Thr168-to-Asp–activated mutant SOS2 partially rescued the salt hypersensitivity in sos2 and sos3 mutant plants. By contrast, SOS2 lacking only the FISL domain suppressed the sos2 but not the sos3 mutation, whereas truncated forms in which the C terminus had been removed could not restore the growth of either sos2 or sos3 plants. Expression of some of the activated SOS2 proteins in wild-type A. thaliana conferred increased salt tolerance. These studies demonstrate that the protein kinase activity of SOS2 is partially sufficient for activation of SOS1 and for salt tolerance in vivo and in planta and that the kinase activity of SOS2 is limiting for plant salt tolerance. The results also reveal an essential in planta role for the SOS2 C-terminal regulatory domain in salt tolerance.en_US
dc.description.sponsorshipThis work was supported by National Institutes of Health Grant R01GM59138 to J.-K.Z., U.S. Department of Energy Grant DE-FG03- 93ER20120 to K.S.S., and the Southwest Consortium on Plant Genetics and Water Resources to J.-K.Z. and K.S.S. F.J.Q. and J.M.P. were supported by Grant BIO2000-0398 from the Spanish Ministry of Science and Technology and Grant CVI-148 from Junta de Andalucía.en_US
dc.format.extent940002 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoengen_US
dc.publisherAmerican Society of Plant Biologistsen_US
dc.rightsclosedAccessen_US
dc.titleTransgenic evaluation of activated mutant alleles of SOS2 reveals a critical requirement for its kinase activity and C-terminal regulatory domain for salt tolerance in Arabidopsis thaliana.en_US
dc.typeArtículoen_US
dc.identifier.doi10.1105/tpc.019174-
dc.description.peerreviewedPeer revieweden_US
dc.contributor.funderNational Institutes of Health (US)-
dc.contributor.funderDepartment of Energy (US)-
dc.contributor.funderMinisterio de Ciencia y Tecnología (España)-
dc.contributor.funderJunta de Andalucía-
dc.identifier.funderhttp://dx.doi.org/10.13039/100000002es_ES
dc.identifier.funderhttp://dx.doi.org/10.13039/501100006280es_ES
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