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• W4221023954 abstract "Many aspects of plant photoperception are mediated by the phytochrome (Phy) family of bilin-containing photoreceptors that reversibly interconvert between inactive Pr and active Pfr conformers1,2. Despite extensive biochemical studies, full understanding of plant Phy signalling has remained unclear due to the absence of relevant 3D models. Here we report a cryo-electron microscopy structure of Arabidopsis PhyB in the Pr state that reveals a topologically complex dimeric organization that is substantially distinct from its prokaryotic relatives. Instead of an anticipated parallel architecture, the C-terminal histidine-kinase-related domains (HKRDs) associate head-to-head, whereas the N-terminal photosensory regions associate head-to-tail to form a parallelogram-shaped platform with near two-fold symmetry. The platform is internally linked by the second of two internal Per/Arnt/Sim domains that binds to the photosensory module of the opposing protomer and a preceding ‘modulator’ loop that assembles tightly with the photosensory module of its own protomer. Both connections accelerate the thermal reversion of Pfr back to Pr, consistent with an inverse relationship between dimer assembly and Pfr stability. Lopsided contacts between the HKRDs and the platform create profound asymmetry to PhyB that might imbue distinct signalling potentials to the protomers. We propose that this unique structural dynamism creates an extensive photostate-sensitive surface for conformation-dependent interactions between plant Phy photoreceptors and their signalling partners. The inactive Pr conformer of Arabidopsis phytochrome B shows a topologically complex dimeric organization that is distinct from its prokaryotic relatives." @default.
• W4221023954 created "2022-04-03" @default.
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• W4221023954 date "2022-03-30" @default.
• W4221023954 modified "2023-10-16" @default.
• W4221023954 title "Plant phytochrome B is an asymmetric dimer with unique signalling potential" @default.
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• W4221023954 doi "https://doi.org/10.1038/s41586-022-04529-z" @default.
• W4221023954 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35355010" @default.
• W4221023954 hasPublicationYear "2022" @default.
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