The F-box protein FKF1 inhibits dimerization of COP1 in the control of photoperiodic flowering.

The F-box protein FKF1 inhibits dimerization of COP1 in the control of photoperiodic flowering.
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DOI:
10.1038/s41467-017-02476-2
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发表时间:
2017-12-22
影响因子:
16.6
通讯作者:
Paek NC
Paek NC
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lee BD;Kim MR;Kang MY;Cha JY;Han SH;Nawkar GM;Sakuraba Y;Lee SY;Imaizumi T;McClung CR;Kim WY;Paek NC

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在拟南芥中,CONSTANS (CO) 在长日照条件下的光周期开花调节中发挥着重要作用。 CO 蛋白仅在长日照的下午稳定,此时它会诱导 FLOWERING LOCUS T (FT) 的表达,从而促进开花。蓝光光感受器 FLAVIN-BINDING、KELCH REPEAT、F-BOX1 (FKF1) 与 CO 相互作用并通过未知机制使其稳定。在这里,我们提供了遗传和生化证据,证明 FKF1 抑制组成型光形态发生蛋白 1 (COP1) 依赖性 CO 降解。光激活的 FKF1 对 COP1 稳定性没有明显影响,但可以与 COP1 相互作用并对 COP1 进行负调节。我们发现 FKF1 可以抑制 COP1 同源二聚化。 COP1 中卷曲螺旋结构域的突变可阻止二聚体形成,从而损害 COP1 协调开花时间的功能。基于这些结果,我们提出了一个模型,通过 FKF1 和 COP1 之间依赖于光和日长的相互作用控制 CO 稳定性来调节开花时间。 CONSTANS 在长日照条件下促进拟南芥开花,但在短日照条件下迅速降解。作者在此表明,蓝光光感受器 FKF1 可以以光依赖性方式与 E3 连接酶 COP1 相互作用,并防止长日照条件下 CO 的降解。
In Arabidopsis thaliana, CONSTANS (CO) plays an essential role in the regulation of photoperiodic flowering under long-day conditions. CO protein is stable only in the afternoon of long days, when it induces the expression of FLOWERING LOCUS T (FT), which promotes flowering. The blue-light photoreceptor FLAVIN-BINDING, KELCH REPEAT, F-BOX1 (FKF1) interacts with CO and stabilizes it by an unknown mechanism. Here, we provide genetic and biochemical evidence that FKF1 inhibits CONSTITUTIVE PHOTOMORPHOGENIC1 (COP1)-dependent CO degradation. Light-activated FKF1 has no apparent effect on COP1 stability but can interact with and negatively regulate COP1. We show that FKF1 can inhibit COP1 homo-dimerization. Mutation of the coiled-coil domain in COP1, which prevents dimer formation, impairs COP1 function in coordinating flowering time. Based on these results, we propose a model whereby the light- and day length-dependent interaction between FKF1 and COP1 controls CO stability to regulate flowering time. CONSTANS promotes flowering under long-day conditions in Arabidopsis but is rapidly degraded in short-day conditions. Here the authors show that the blue-light photoreceptor FKF1 can interact with the E3 ligase COP1 in a light-dependent manner and prevent degradation of CO in long-day conditions.
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