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Plant and Cell Physiology Advance Access published online on March 26, 2009
Plant and Cell Physiology, doi:10.1093/pcp/pcp048
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

A Novel Group of Transcriptional Repressors in Arabidopsis

Miho Ikeda and Masaru Ohme-Takagi

Research Institute of Genome-based Biofactory, National Institute of Advanced Industrial Science and Technology (AIST), Central 4, Tsukuba 305-8562, Japan

Corresponding Author: Dr. Masaru Ohme-Takagi, Research Institute of Genome-based Biofactory, National Institute of Advanced Industrial Science and Technology (AIST), Central 4, Tsukuba 305-8562, Japan, Tel;+81-29-861-2641, Fax;+81-29-861-3026, e-mail; m-takagi{at}aist.go.jp


  Abstract

We showed previously that the EAR motif is a plant-specific repression domain that contains the conserved amino acid sequence LXLXL. In this report, we describe the identification of a novel repression domain, L/VR/KLFGVXM/V/L, which is different from known EAR motifs, in B3 DNA-binding domain transcription factors in Arabidopsis. Database analysis revealed that 29 Arabidopsis transcription factors, which included members of the RAV, ARF, Hsf and MYB families, contain the R/KLFGV conserved motif found in the novel repression domain. We demonstrated that factors that contain the R/KLFGV motif, namely, RAV1, RAV2, HsfB1 and HsfB2b, exhibited the repressive activity.

(Received January 13, 2009; Accepted March 25, 2009)
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N. Mitsuda and M. Ohme-Takagi
Functional Analysis of Transcription Factors in Arabidopsis
Plant Cell Physiol., July 1, 2009; 50(7): 1232 - 1248.
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