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The Association Kinetics Encode the Light Dependence of Arabidopsis Phytochrome B Interactions

Title data

Golonka, David ; Gerken, Uwe ; Köhler, Jürgen ; Möglich, Andreas:
The Association Kinetics Encode the Light Dependence of Arabidopsis Phytochrome B Interactions.
In: Journal of Molecular Biology. Vol. in press (2020) .
ISSN 0022-2836
DOI: https://doi.org/10.1016/j.jmb.2020.06.001

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Plant phytochromes enable vital adaptations to red and far-red light. At the molecular level, these responses are mediated by light-regulated interactions between phytochromes and partner proteins, foremost the phytochrome-interacting factors (PIF). Although known for decades, quantitative analyses of these interactions have long been sparse. To address this deficit, we here studied by an integrated fluorescence-spectroscopic approach the equilibrium and kinetics of Arabidopsis thaliana phytochrome B (AtPhyB) binding to a tetramerized PIF6 variant. Several readouts consistently showed the stringently light-regulated interaction to be little affected by PIF tetramerization. Analysis of the binding kinetics allowed the determination of bimolecular association and unimolecular dissociation rate constants as a function of light. Unexpectedly, the stronger affinity of AtPhyB under red light relative to far-red light is entirely due to accelerated association rather than decelerated dissociation. The association reaction under red light is highly efficient and only threefold slower than the diffusion limit. The present findings pertain equally to the analysis of signal transduction in plants and to the biotechnological application of phytochromes.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Binding; Fluorescence spectroscopy; Kinetics; Optogenetics; Phytochrome; Protein–protein interaction; Sensory photoreceptor; Signal transduction
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics IX - Spectroscopy of Soft Matter > Chair Experimental Physics IX - Spectroscopy of Soft Matter - Univ.-Prof. Dr. Jürgen Köhler
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Biochemistry > Chair Biochemistry - Univ.-Prof. Dr. Andreas Möglich
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
500 Science > 570 Life sciences, biology
Date Deposited: 24 Jun 2020 06:58
Last Modified: 24 Jun 2020 06:58
URI: https://eref.uni-bayreuth.de/id/eprint/55591