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• W3098780973 abstract "Optogenetics is a powerful technique using photoresponsive proteins, and the light-inducible dimerization (LID) system, an optogenetic tool, allows to manipulate intracellular signaling pathways. One of the red/far-red responsive LID systems, phytochrome B (PhyB)–phytochrome interacting factor (PIF), has a unique property of controlling both association and dissociation by light on the second time scale, but PhyB requires a linear tetrapyrrole chromophore such as phycocyanobilin (PCB), and such chromophores are present only in higher plants and cyanobacteria. Here, we report that we further improved our previously developed PCB synthesis system (SynPCB) and successfully established a stable cell line containing a genetically encoded PhyB-PIF LID system. First, four genes responsible for PCB synthesis, namely, PcyA, HO1, Fd, and Fnr, were replaced with their counterparts derived from thermophilic cyanobacteria. Second, Fnr was truncated, followed by fusion with Fd to generate a chimeric protein, tFnr-Fd. Third, these genes were concatenated with P2A peptide cDNAs for polycistronic expression, resulting in an approximately 4-fold increase in PCB synthesis compared with the previous version. Finally, we incorporated the PhyB, PIF, and SynPCB system into drug inducible lentiviral and transposon vectors, which enabled us to induce PCB synthesis and the PhyB-PIF LID system by doxycycline treatment. These tools provide a new opportunity to advance our understanding of the causal relationship between intracellular signaling and cellular functions." @default.
• W3098780973 created "2020-11-23" @default.
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• W3098780973 date "2020-11-09" @default.
• W3098780973 modified "2023-10-14" @default.
• W3098780973 title "Improvement of Phycocyanobilin Synthesis for Genetically Encoded Phytochrome-Based Optogenetics" @default.
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• W3098780973 doi "https://doi.org/10.1021/acschembio.0c00477" @default.
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