The results of these experiments are consistent with a model in which kinase-mediated phosphorylation within the C-terminal region is inhibitory and regulates catalytic activity. These data represent a step further toward understanding the molecular basis for the protein kinase catalytic activity of FERONIA and show promise for future characterization of eukaryotic membrane proteins.
Genetic crosses between the cas-c1 mutant and scn1 or rhd2 mutants were performed, and the detailed phenotypic and molecular characterization of the double mutants demonstrates that scn1 mutation is epistatic to cas-c1 and cas-c1 is epistatic to rhd2 mutation, indicating that CAS-C1 acts in early steps of the root hair development process.[CAS-C1]
Genetic crosses between the cas-c1 mutant and scn1 or rhd2 mutants were performed, and the detailed phenotypic and molecular characterization of the double mutants demonstrates that scn1 mutation is epistatic to cas-c1 and cas-c1 is epistatic to rhd2 mutation, indicating that CAS-C1 acts in early steps of the root hair development process.
AtNRT2.5 is predominantly expressed in roots of nitrate-deprived WT plants as a 150 kDa molecular complex with AtNAR2.1. Estimates of the kinetic properties of the NRT2.5 transporter reveal that its low Km for nitrate makes this transporter ideally suited to detect and respond to trace quantities of nitrate in the root environment. [AtNRT2.5]
RecQ helicases AtRECQ2 and AtRECQ3 both show highly repetitive DNA unwinding. Although AtRECQ2 preferentially orients itself towards the junction to unwind it, AtRECQ3 moves in the opposite direction and processively rewinds, that is, helps closing, unzipped hairpins over hundreds of bases. Thus RecQ helicases can exhibit antagonistic activities on the molecular level. [RECQ2]
Based on ensuing molecular and biochemical analyses, we propose a mechanistic model, in which bZIP11-related TFs gain control over the root meristem by directly activating IAA3/SHY2 transcription. IAA3/SHY2 is a pivotal negative regulator of root growth, which has been demonstrated to efficiently repress transcription of major auxin transport facilitators of the PIN-FORMED (PIN) gene family, thereby restricting polar auxi
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