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FHY1 和 FHY1-LIKE 在细胞核中不参与光敏色素 A 信号转导。

FHY1 and FHY1-LIKE Are Not Required for Phytochrome A Signal Transduction in the Nucleus.

机构信息

Center for Plant Molecular Biology, University of Tübingen, 72076 Tübingen, Germany.

Faculty of Biology, Institute of Biology II, University of Freiburg, 79104 Freiburg, Germany.

出版信息

Plant Commun. 2019 Nov 9;1(2):100007. doi: 10.1016/j.xplc.2019.100007. eCollection 2020 Mar 9.

Abstract

Photoreceptors of the phytochrome family control a multitude of responses in plants. Phytochrome A (phyA) is essential for far-red light perception, which is important for germination and seedling establishment in strong canopy shade. Translocation of phyA from the cytosol into nucleus is a key step in far-red light signaling and requires FAR-RED ELONGATED HYPOCOTYL 1 (FHY1) and FHY1-LIKE (FHL). FHY1/FHL bind to phyA downstream signaling components. Therefore, it has been suggested that FHY1/FHL also have a function in assembling phyA transcription factor complexes in the nucleus. Yet, in this study, we show that constitutively nuclear-localized phyA is active in the absence of FHY1 and FHL. Furthermore, an artificial FHY1, consisting of an SV40 NLS, a phyA binding site, and a YFP tag as spacer between them, complements the double mutant. These findings show that FHY1 and FHL are not required for phyA downstream signaling in the nucleus. However, we found that lines expressing phyA-NLS-YFP are hypersensitive to red and far-red light and that slightly increased levels of constitutively nuclear-localized phyA result in photomorphogenic development in the dark. Thus, restricting phyA to the cytosol and inducing nuclear transport in light by interaction with FHY1/FHL might be important to suppress photomorphogenesis in the dark.

摘要

光受体家族的光敏色素控制着植物的多种反应。光敏色素 A(phyA)是远红光感知所必需的,这对于强冠层遮荫下的萌发和幼苗建立很重要。phyA 从细胞质易位到细胞核是远红光信号传导的关键步骤,需要 FAR-RED ELONGATED HYPOCOTYL 1(FHY1)和 FHY1-LIKE(FHL)。FHY1/FHL 与 phyA 下游信号成分结合。因此,有人认为 FHY1/FHL 也在核内组装 phyA 转录因子复合物中发挥作用。然而,在这项研究中,我们表明,在没有 FHY1 和 FHL 的情况下,组成型核定位的 phyA 是有活性的。此外,由 SV40 NLS、phyA 结合位点和它们之间的 YFP 标签组成的人工 FHY1 补充了双突变体。这些发现表明,FHY1 和 FHL 不是核内 phyA 下游信号所必需的。然而,我们发现表达 phyA-NLS-YFP 的系对红光和远红光敏感,并且略微增加组成型核定位的 phyA 水平会导致黑暗中光形态发生发育。因此,将 phyA 限制在细胞质中并通过与 FHY1/FHL 的相互作用诱导光下的核转运,可能对于抑制黑暗中的光形态发生很重要。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a8f2/7748001/781e7358cbe6/gr1.jpg

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