UVR8 photoreceptor action

紫外线-B（UV-B）辐射是太阳光中一种微小但能量很大的成分。暴露于紫外线B波长（280-315纳米）对植物有许多影响，包括新陈代谢和发育的变化，影响生物化学组成、植物结构和对害虫和病原体的防御。紫外线B辐射的影响是由于它能够调节许多植物基因的表达，包括那些参与代谢途径、紫外线防护、形态发生和防御的基因。因此，了解植物如何感知UV-B辐射以及它如何引发反应非常重要。参与这些过程的一个关键成分是一种称为UVR 8的蛋白质，它作为光受体来检测UV-B辐射。UVR 8与其他几种蛋白质相互作用，包括一些调节基因表达的蛋白质，以启动植物对UV-B的反应，但也与抑制UVR 8活性的蛋白质相互作用。然而，我们对决定UVR 8如何与这些蛋白质差异地相互作用以控制其活性的分子机制知之甚少，尽管我们知道它涉及UVR 8蛋白的特定区域。该项目的基础是，我们最近确定了一种机制，该机制在调节哪些蛋白质与UVR 8相互作用以调节反应方面非常重要。因此，本项目的目的是更全面地了解这种机制以及它如何影响UVR 8的作用。除了建立UVR 8作用的分子基础外，所获得的信息还开辟了鉴定UVR 8及其相互作用蛋白的变体的可能性，这些变体将允许操纵作物植物中的UVR 8活性以提高质量和生产力。

Ultraviolet-B (UV-B) radiation is a minor but very energetic component of sunlight. Exposure to UV-B wavelengths (280-315 nm) has numerous effects on plants, including changes in metabolism and development that impact biochemical composition, plant architecture and defence against pests and pathogens. The effects of UV-B radiation are due to its ability to regulate the expression of numerous plant genes, including those involved in metabolic pathways, UV-protection, morphogenesis and defence. It is therefore important to understand how UV-B radiation is perceived by plants and how it initiates responses. A pivotal component involved in these processes is a protein called UVR8, which acts as a photoreceptor to detect UV-B radiation. UVR8 physically interacts with several other proteins, including a number of proteins that regulate gene expression, to initiate responses to UV-B in plants, but also with proteins that repress UVR8 activity. However, we have little understanding of the molecular mechanisms that determine how UVR8 interacts differentially with these proteins to control its activity, although we know that it involves a particular region of the UVR8 protein. The basis of this project is that we have recently identified a mechanism that is important in regulating which proteins interact with UVR8 to modulate responses. Hence the aim of this project is to gain a more complete understanding of this mechanism and how it affects UVR8 action. In addition to establishing the molecular basis of UVR8 action, the information gained opens up the possibility of identifying variants of UVR8 and its interacting proteins that would allow manipulation of UVR8 activity in crop plants to enhance aspects of quality and productivity.