Journal Article

Two-Component Response Regulators from <i>Arabidopsis thaliana</i> Contain a Putative DNA-Binding Motif

Hiroe Sakai, Takashi Aoyama, Hidemasa Bono and Atsuhiro Oka

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 11, pages 1232-1239
Published in print November 1998 | ISSN: 0032-0781
Published online November 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029325
Two-Component Response Regulators from Arabidopsis thaliana Contain a Putative DNA-Binding Motif

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An expression sequence tag database of higher plants was screened by in silico profile analysis for response regulators of the two-component regulatory system. Two closely related clones (ARR1 and ARR2), corresponding to one of the extracted candidates, were isolated from Arabidopsis thaliana. The two genes were comparably expressed in all tissues, and at higher levels in the roots. The amino-terminal half of their translation products was highly conserved. This is where a phosphate receiver domain with the landmark aspartate residue and a putative DNA-binding domain were located. Their carboxyl-terminal halves, although less similar to each other, included glutamine-rich and proline-rich regions characteristic of the transcrip-tional activation domain of eukaryotes. This architecture resembles that of typical bacterial response regulators serving as transcription factors.

Keywords: Arabidopsis; Response regulator; Signal transduction; Transcription factor; Two-component regulatory system.

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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