期刊
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
卷 65, 期 9, 页码 2113-2117出版社
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.65.2113
关键词
Arabidopsis thaliana; His-to-Asp phosphorelay; response regulators; HPt factors; His-kinases
In the higher plant, Arabidopsis thaliana, histidine-to-aspartate (His-to-Asp) phosphorelay signal transduction systems play crucial roles in propagation of environmental stimuli, including plant hormones. This plant has 11 sensor His-kinases, 5 histidine-containing phosphotransfer (HPt) factors (AHPs), and 20 response regulators (ARRs). To gain new insight into the functions of these phosphorelay components, their intracellular localization was examined with use of GFP-fusion proteins, constructed for certain representatives of HPt factors (AHP2) and type-A and type-B ARRs (ARR6/ ARR7 and ARR10, respectively). The results showed that AHP2 is mainly located in the cytoplasmic space, while both the types of ARRs have an ability to enter preferentially into the nuclei, if not exclusively. Together with the results from an in vitro phosphorelay assay with AHP2 and ARRs, these results are discussed, in terms of a geneal framework of the Arabidopsis Histo-Asp phosphorelay network.
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