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Arabidopsis nph1 and npl1: Blue light receptors that mediate both phototropism and chloroplast relocation
It is demonstrated that npl1, like nph1, noncovalently binds the chromophore flavin mononucleotide (FMN) within two specialized PAS domains, termed LOV domains, indicating that nPL1 also functions as a light receptor kinase.
FKF1 is essential for photoperiodic-specific light signalling in Arabidopsis
- T. Imaizumi, Hien G. Tran, T. Swartz, W. Briggs, S. Kay
- Environmental Science, BiologyNature
- 20 November 2003
It is shown that the clock-controlled FLAVIN-BINDING, KELCH REPEAT, F-BOX (FKF1) protein has an essential role in generating the diurnal CO peak and that this function is dependent on light, indicating that FKF1 may function as a photoperiodic blue-light receptor.
Arabidopsis NPH1: a protein kinase with a putative redox-sensing domain.
The NPH1 (nonphototropic hypocotyl 1) gene encodes an essential component acting very early in the signal-transduction chain for phototropism. Arabidopsis NPH1 contains a serine-threonine kinase…
Photochemical and mutational analysis of the FMN-binding domains of the plant blue light receptor, phototropin.
It is demonstrated that the LOV domains of Avena sativa phototropin undergo a self-contained photocycle characterized by a loss of blue light absorbance in response to light and a spontaneous recovery of the blue light-absorbing form in the dark.
The Photocycle of a Flavin-binding Domain of the Blue Light Photoreceptor Phototropin*
- T. Swartz, Stephanie B. Corchnoy, R. Bogomolni
- Biology, ChemistryThe Journal of Biological Chemistry
- 28 September 2001
It has been shown that the metastable species is likely a flavin-cysteine (Cys39 thiol) adduct at the flavin C(4a) position, and Titrations of LOV2 using chromophore fluorescence as an indicator suggest that Cys39 exists as a thiolate.
Annual review of plant physiology and plant molecular biology
Cellular and Subcellular Localization of Phototropin 1 Article, publication date, and citation information can be found at www.plantcell.org/cgi/doi/10.1105/tpc.003293.
A phot1 null mutant of Arabidopsis was transformed with a construct encoding translationally fused phot1–green fluorescent protein (GFP) under the control of the endogenous PHOT1 promoter and investigated its cellular and subcellular distribution.
Phototropins 1 and 2: versatile plant blue-light receptors.
Regulation of Flavonoid Biosynthetic Genes in Germinating Arabidopsis Seedlings.
- W. Kubasek, B. W. Shirley, A. McKillop, H. Goodman, W. Briggs, F. Ausubel
- Environmental ScienceThe Plant cell
- 1 October 1992
The results suggest that the flavonoid biosynthetic pathway is coordinately regulated by a developmental timing mechanism during germination, and is induced most effectively by UVB light and blue light induction is mediated by a specific blue light receptor.
Mutations in the NPH1 locus of Arabidopsis disrupt the perception of phototropic stimuli.
It appears that the NPH1 protein is most likely a 120-kD plasma membrane-associated phosphoprotein because all of the nph1 mutations negatively affected the abundance of this protein, providing strong support for the hypothesis that more than one blue light photoreceptor is required for the normal growth and development of a seedling.