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Arabidopsis SGT1b Is Required for Defense Signaling Conferred by Several Downy mildew Resistance Genes

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Tör, M. ORCID: https://orcid.org/0000-0002-4416-5048, Gordon, P., Cuzick, A., Eulgem, T., Sinapidou, E., Mert-Türk, F., Can, C. and Dangl, J.L. (2002) Arabidopsis SGT1b Is Required for Defense Signaling Conferred by Several Downy mildew Resistance Genes. Plant Cell, 14 (5). pp. 993-1003. ISSN Print: 1040-4651 Online: 1532-298X

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Official URL: http://www.plantcell.org/cgi/content/full/14/5/993

Abstract

We describe the identification of a mutant in the Arabidopsis accession Columbia (Col-0) that exhibits enhanced downy mildew (edm1) susceptibility to several Peronospora parasitica isolates, including the RPP7-diagnostic isolate Hiks1. The mutation was mapped to chromosome IV and characterized physically as a 35-kb deletion spanning seven genes. One of these genes complemented the mutant to full wild-type resistance against all of the Peronospora isolates tested. This gene (AtSGT1b) encodes a predicted protein of 39.8 kD and is an Arabidopsis ortholog of yeast SGT1, which was described originally as a key regulatory protein in centromere function and ubiquitin-mediated proteolysis. AtSGT1b contains three tetratricopeptide repeats at the N terminus followed by a bipartite chord-containing SGT domain and an SGT-specific domain at the C terminus. We discuss the role of AtSGT1b in disease resistance and its possible involvement in ubiquitin-mediated proteolysis in plants.

Item Type:	Article
Additional Information:	This is an Open Access article. The full-text can be accessed via the Official URL. Originally deposited as joint division with National Pollen and Aerobiology Research Unit (NPARU)
Uncontrolled Discrete Keywords:	Arabidopsis, defence signaling, downy mildew genes
Subjects:	Q Science > QK Botany Q Science > QH Natural history > QH426 Genetics Q Science > QH Natural history > QH301 Biology Q Science > QR Microbiology
Divisions:	College of Health, Life and Environmental Sciences > School of Science and the Environment
Depositing User:	Janet Davidson
Date Deposited:	19 Jan 2011 19:53
Last Modified:	17 Jun 2020 16:54
URI:	https://eprints.worc.ac.uk/id/eprint/1170

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