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Cryptochrome-mediated blue-light signalling modulates UVR8 photoreceptor activity and contributes to UV-B tolerance in Arabidopsis.
Nature Communications ( IF 14.7 ) Pub Date : 2020-03-12 , DOI: 10.1038/s41467-020-15133-y Nicolas Tissot 1, 2 , Roman Ulm 1, 2
Nature Communications ( IF 14.7 ) Pub Date : 2020-03-12 , DOI: 10.1038/s41467-020-15133-y Nicolas Tissot 1, 2 , Roman Ulm 1, 2
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UV-B constitutes a critical part of the sunlight reaching the earth surface. The homodimeric plant UV-B photoreceptor UV RESISTANCE LOCUS 8 (UVR8) monomerizes in response to UV-B and induces photomorphogenic responses, including UV-B acclimation and tolerance. REPRESSOR OF UV-B PHOTOMORPHOGENESIS 1 (RUP1) and RUP2 are negative feedback regulators that operate by facilitating UVR8 ground state reversion through re-dimerization. Here we show that RUP1 and RUP2 are transcriptionally induced by cryptochrome photoreceptors in response to blue light, which is dependent on the bZIP transcriptional regulator ELONGATED HYPOCOTYL 5 (HY5). Elevated RUP1 and RUP2 levels under blue light enhance UVR8 re-dimerization, thereby negatively regulating UVR8 signalling and providing photoreceptor pathway cross-regulation in a polychromatic light environment, as is the case in nature. We further show that cryptochrome 1, as well as the red-light photoreceptor phytochrome B, contribute to UV-B tolerance redundantly with UVR8. Thus, photoreceptors for both visible light and UV-B regulate UV-B tolerance through an intricate interplay allowing the integration of diverse sunlight signals.
中文翻译：
隐花色素介导的蓝光信号调节拟南芥中的UVR8感光受体活性并有助于UV-B耐受。
UV-B构成了到达地面的阳光的关键部分。同型二聚体植物UV-B感光体UV抵抗力位点8（UVR8）响应UV-B并发生光致形态反应，包括UV-B适应和耐受。UV-B光生热抑制剂1（RUP1）和RUP2的阻遏物是负反馈调节剂，其通过通过二聚作用促进UVR8基态回复而工作。在这里，我们显示RUP1和RUP2是由隐色光感受器响应蓝光而转录诱导的，蓝光取决于bZIP转录调节剂ELONGATED HYPOCOTYL 5（HY5）。蓝光下升高的RUP1和RUP2水平可增强UVR8的二聚作用，从而在多色光环境中负面调节UVR8信号传导并提供光感受器途径的交叉调节，就像大自然一样。我们进一步表明，隐色染料1以及红光感光细胞色素B在UVR8的作用下对UV-B的耐受性过多。因此，可见光和UV-B的感光体通过复杂的相互作用调节UV-B耐受性，从而可以整合各种阳光信号。
更新日期：2020-03-12
中文翻译：
隐花色素介导的蓝光信号调节拟南芥中的UVR8感光受体活性并有助于UV-B耐受。
UV-B构成了到达地面的阳光的关键部分。同型二聚体植物UV-B感光体UV抵抗力位点8（UVR8）响应UV-B并发生光致形态反应，包括UV-B适应和耐受。UV-B光生热抑制剂1（RUP1）和RUP2的阻遏物是负反馈调节剂，其通过通过二聚作用促进UVR8基态回复而工作。在这里，我们显示RUP1和RUP2是由隐色光感受器响应蓝光而转录诱导的，蓝光取决于bZIP转录调节剂ELONGATED HYPOCOTYL 5（HY5）。蓝光下升高的RUP1和RUP2水平可增强UVR8的二聚作用，从而在多色光环境中负面调节UVR8信号传导并提供光感受器途径的交叉调节，就像大自然一样。我们进一步表明，隐色染料1以及红光感光细胞色素B在UVR8的作用下对UV-B的耐受性过多。因此，可见光和UV-B的感光体通过复杂的相互作用调节UV-B耐受性，从而可以整合各种阳光信号。
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