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-Structure paper
タイトル | Light-induced remodeling of phytochrome B enables signal transduction by phytochrome-interacting factor. |
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ジャーナル・号・ページ | Cell, Vol. 187, Issue 22, Page 6235-6250.e19, Year 2024 |
掲載日 | 2024年10月31日 |
著者 | Zhengdong Wang / Wenfeng Wang / Didi Zhao / Yanping Song / Xiaoli Lin / Meng Shen / Cheng Chi / Bin Xu / Jun Zhao / Xing Wang Deng / Jizong Wang / |
PubMed 要旨 | Phytochrome B (phyB) and phytochrome-interacting factors (PIFs) constitute a well-established signaling module critical for plants adapting to ambient light. However, mechanisms underlying phyB ...Phytochrome B (phyB) and phytochrome-interacting factors (PIFs) constitute a well-established signaling module critical for plants adapting to ambient light. However, mechanisms underlying phyB photoactivation and PIF binding for signal transduction remain elusive. Here, we report the cryo-electron microscopy (cryo-EM) structures of the photoactivated phyB or the constitutively active phyB mutant in complex with PIF6, revealing a similar trimer. The light-induced configuration switch of the chromophore drives a conformational transition of the nearby tongue signature within the phytochrome-specific (PHY) domain of phyB. The resulting α-helical PHY tongue further disrupts the head-to-tail dimer of phyB in the dark-adapted state. These structural remodelings of phyB facilitate the induced-fit recognition of PIF6, consequently stabilizing the N-terminal extension domain and a head-to-head dimer of activated phyB. Interestingly, the phyB dimer exhibits slight asymmetry, resulting in the binding of only one PIF6 molecule. Overall, our findings solve a key question with respect to how light-induced remodeling of phyB enables PIF signaling in phytochrome research. |
リンク | Cell / PubMed:39317197 |
手法 | EM (単粒子) |
解像度 | 3.1 - 3.19 Å |
構造データ | EMDB-39108, PDB-8yb4: EMDB-60916, PDB-9iuz: |
化合物 | ChemComp-O6E: |
由来 |
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キーワード | GENE REGULATION / phytochrome / phytochrome interaction factor / signal complex / SIGNALING PROTEIN / Phytochrome-interacting factor |