Abstract
The phototropins (phot1 and phot2)are plant blue-light photoreceptors that mediate phototropism, chloroplast relocation, stomatal opening, leaf expansion, and rapid inhibition of hypocotyl growth ([Briggs and Christie 2002]). They contain two 10kDa FMN-binding LOV domains (LOV1 and LOV2)with a serine/ threonine kinase at the C-terminal region. Light absorbed by the flavin chro- mophore results in the transient formation of a covalent flavoprotein adduct and a localized protein structural perturbation. Intramolecular propagation of this conformational change results in activation of the kinase moiety and hierarchical autophosphorylation at several sites located in the protein region between the two LOV domains and near the N-terminus. Thus, adduct formation is viewed as a light-driven molecular switch that activates the subsequent molec- ular events.
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Bogomolni, R.A., Swartz, T.E., Briggs, W.R. (2005). Proton Transfer Reactions in LOV-Domain Photochemistry. In: Wada, M., Shimazaki, Ki., Iino, M. (eds) Light Sensing in Plants. Springer, Tokyo. https://doi.org/10.1007/4-431-27092-2_16
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DOI: https://doi.org/10.1007/4-431-27092-2_16
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