NDLI: Rapid stimulation of a soybean protein-serine kinase that phosphorylates a novel bZIP DNA-binding protein, G/HBF-1, during the induction of early transcription-dependent defenses.

Content Provider	PubMed Central
Author	Dröge-laser, W. Kaiser, A. Lindsay, W. P. Halkier, B. A. Loake, G. J. Doerner, P. Dixon, R. A. Lamb, C.
Abstract	The G-box (CACGTG) and H-box (CCTACC) cis elements function in the activation of phenylpropanoid biosynthetic genes involved in the elaboration of lignin precursors, phytoalexins and the secondary signal salicylic acid as early responses to pathogen attack. We have isolated a soybean cDNA encoding a novel bZIP protein, G/HBF-1, which binds to both the G-box and adjacent H-box in the proximal region of the chalcone synthase chs15 promoter. While G/HBF-1 transcript and protein levels do not increase during the induction of phenylpropanoid biosynthetic genes, G/HBF-1 is phosphorylated rapidly in elicited soybean cells, almost exclusively on serine residues. Using recombinant G/HBF-1 as a substrate, we identified a cytosolic protein-serine kinase that is rapidly and transiently stimulated in cells elicited with either glutathione or an avirulent strain of the soybean pathogen Pseudomonas syringae pv. glycinea. Phosphorylation of G/HBF-1 in vitro enhances binding to the chs15 promoter and we conclude that stimulation of G/HBF-1 kinase activity and G/HBF-1 phosphorylation are terminal events in a signal pathway for activation of early transcription-dependent plant defense responses.
Related Links	http://dx.doi.org/10.1093/emboj/16.4.726
Ending Page	738
Page Count	13
Starting Page	726
File Format	PDF
ISSN	14602075
e-ISSN	14602075
Journal	The EMBO Journal
Issue Number	4
Volume Number	16
Language	English
Publisher Date	1997-02-15
Access Restriction	Open
Subject Keyword	Biochemistry, Genetics and Molecular Biology(all) Immunology and Microbiology(all) Neuroscience(all) Molecular Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience Immunology and Microbiology Medicine Molecular Biology

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