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THE PLANT CELL, Vol 5, Issue 11 1529-1539, Copyright © 1993 by American Society of Plant Biologists
An Arabidopsis myb Homolog Is Induced by Dehydration Stress and Its Gene Product Binds to the Conserved MYB Recognition Sequence
T. Urao, K. Yamaguchi-Shinozaki, S. Urao and K. Shinozaki
Laboratory of Plant Molecular Biology, The Institute of Physical and Chemical Research (RIKEN), Tsukuba Life Science Center, 3-1-1 Koyadai, Tsukuba, Ibaraki 305, Japan
An Arabidopsis cDNA (Atmyb2) that contains a sequence that encodes a
transcription factor, which is a homolog of MYB, was cloned from a cDNA
library prepared from dehydrated Arabidopsis rosette plants. A gene
(Atmyb2) corresponding to the Atmyb2 cDNA was also cloned and its
nucleotide sequence was determined. RNA gel blot analysis showed that the
Atmyb2 mRNA was induced by dehydration and disappeared upon rehydration.
The Atmyb2 mRNA also accumulated upon salt stress and with the onset of
treatment with abscisic acid. A [beta]-glucuronidase reporter gene driven
by the Atmyb2 promoter was induced by dehydration and salt stress in
transgenic Arabidopsis plants. These observations indicate that Atmyb2 is
responsive to dehydration at the transcriptional level. The putative
protein (ATMYB2) encoded by Atmyb2 has 274 amino acids, a molecular mass of
32 kD, and a putative DNA binding domain that shows considerable homology
to plant MYB-related proteins, such as maize C1. A fusion protein that
included ATMYB2 was expressed in Escherichia coli, and it bound
specifically to oligonucleotides that contained a consensus MYB recognition
sequence (TAACTG), such as is found in the simian virus 40 enhancer and the
maize bronze-1 promoter. Binding was sequence specific, as indicated by a
gel mobility shift experiment. These results suggest that a MYB-related
transcription factor is involved in the regulation of genes that are
responsive to water stress in Arabidopsis.
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