Variable interactions between sucrose non-fermented 1-related protein kinases and regulatory proteins in higher plants.
WPK4 is a sucrose non-fermented 1 (SNF1)-related wheat protein kinase, and was previously reported to interact with 14-3-3 proteins. We identified four Arabidopsis thaliana WPK4-like genes, and designated them AtWL1 through AtWL4. Yeast two-hybrid analysis, however, indicated that none of the AtWLs interacted with any of A. thaliana 14-3-3 (At14-3-3) proteins, although WPK4 itself interacted with six of them. Structurally, AtWLs were classified into a subfamiliy of AtCIPK, which generally interacts with calucineurin B-like proteins (CBL). This was also the case for AtWL1 and AtWL2, showing an efficient interaction with AtCBL2. In contrast, WPK4 interacted with none of the CBLs. In addition, to ascertain the possible interaction in vivo, expression of those genes was examined with a promoter-GUS assay. These results suggested that the interacting partner of SNF1-related protein kinases varies among plant species, and that, in the case of A. thaliana, it was CBLs, some of which were predicted to broadly regulate multiple CIPKs.
Nozawa
Akira
A
Research and Education Center for Genetic Information, Nara Institute of Science and Technology, Ikoma, Japan.
Sawada
Yasutaka
Y
Akiyama
Tsuyoshi
T
Koizumi
Nozomu
N
Sano
Hiroshi
H
D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002135:Calcium-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000502:physiology*; D017343:Genes, Plant; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000235:genetics; D011485:Protein Binding; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D020798:Two-Hybrid System Techniques
D029681:Arabidopsis Proteins; C417306:CBL protein, Arabidopsis; D002135:Calcium-Binding Proteins; D010940:Plant Proteins; C071570:SNF1-related protein kinases; D017346:Protein Serine-Threonine Kinases