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Plant and Cell Physiology, 2001, Vol. 42, No. 2 107-113
© 2001 Oxford University Press


Paper

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

Tomomi Suzuki1, Kumiko Miwa1, Kuniko Ishikawa, Hisami Yamada, Hirofumi Aiba and Takeshi Mizuno2

Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University, Chikusa-ku, Nagoya, 464-8601 Japan

Abstract

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.

Footnotes

1 These two authors equally contributed to this work.

2 Corresponding author: E-mail, tmizuno@agr.nagoya-u.ac.jp; Fax, +81-52-789-4089.


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