Journal Article

The Arabidopsis Sensor His-kinase, AHK4, Can Respond to Cytokinins

Tomomi Suzuki, Kumiko Miwa, Kuniko Ishikawa, Hisami Yamada, Hirofumi Aiba and Takeshi Mizuno

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 2, pages 107-113
Published in print February 2001 | ISSN: 0032-0781
Published online February 2001 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pce037
The Arabidopsis Sensor His-kinase, AHK4, Can Respond to Cytokinins

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His-to-Asp (His→Asp) phosphorelay mechanisms are presumably involved in propagation of certain environmental stimuli, including phytohormones, in Arabidopsis thaliana. In addition to the previously characterized His-kinases, namely, the ETR1 family of ethylene receptors, CKI1 cytokinin-sensor, and ATHK1 osomo-sensor, this higher plant has three more His-kinases (named AHK2, AHK3, and AHK4). By employing the well-known His→Asp phosphorelay systems in both the fission yeast and Escherichia coli, evidence is presented showing that the AHK4 His-kinase has an ability to serve as a cytokinin-responsive environmental sensor. Taking advantage of this AHK4-dependent His→Asp phosphorelay system in E. coli, a phosphorelay interaction between the Arabidopsis His-kinase and histidine-containing phosphotransmitters (AHPs) was also demonstrated for the first time.

Keywords: Key words: Arabidopsis — His-kinase — Phosphorelay — Phytohormones — Cytokinins.; Abbreviations: AHK, Arabidopsis His-kinases; AHP, Arabidopsis HPt factors.

Journal Article.  5448 words.  Illustrated.

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

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