Functional domain studies uncover novel roles for the ZTL Kelch repeat domain in clock function.

Functional domain studies uncover novel roles for the ZTL Kelch repeat domain in clock function.
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功能域研究揭示了ZTL Kelch重复结构域在时钟功能中的新角色。

DOI:
10.1371/journal.pone.0235938
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发表时间:
2021
期刊:
影响因子:
3.7
通讯作者:
Gendron JM
Gendron JM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Feke A;Vanderwall M;Liu W;Gendron JM

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E3泛素连接酶的小LOV/F-box/Kelch家族通过感知黄昏在植物生物钟和开花时间的调节中起着至关重要的作用。该家族由三个成员组成,ZEITLUPE(ZTL)、LOV KELCH蛋白2(LKP 2)和黄素结合KELCH重复F盒蛋白1(FKF 1),它们共享一个独特的蛋白质结构域结构,允许它们作为光受体,通过改变靶蛋白的稳定性来抑制光信号。尽管对该蛋白质家族进行了深入研究,但我们仍然缺乏关于组成这些独特光感受器的蛋白质结构域的生物化学和功能作用的重要知识。在这里,我们进行比较分析的转基因株系组成型表达的光感受器LOV域或Kelch重复蛋白质-蛋白质相互作用域的ZTL,FKF 1,和LKP 2。每个域的单独表达足以破坏昼夜节律和开花时间,但每个域的影响程度不同。免疫沉淀,然后与ZTL Kelch重复结构域的质谱确定了一套潜在的相互作用的合作伙伴。此外,ZTL Kelch重复结构域可以与ZTL同源物LKP 2和FKF 1以及ZTL本身的LOV结构域相互作用。这表明了一个假设,即ZTL的Kelch重复结构域可能介导三种LOV/F-box/Kelch蛋白的分子间和分子内相互作用,并提供了对蛋白质复合物组成的额外了解和Kelch重复结构域的额外作用。
The small LOV/F-box/Kelch family of E3 ubiquitin ligases plays an essential role in the regulation of plant circadian clocks and flowering time by sensing dusk. The family consists of three members, ZEITLUPE (ZTL), LOV KELCH PROTEIN 2 (LKP2), and FLAVIN-BINDING KELCH REPEAT F-BOX PROTEIN 1 (FKF1), which share a unique protein domain architecture allowing them to act as photoreceptors that transduce light signals via altering stability of target proteins. Despite intensive study of this protein family we still lack important knowledge about the biochemical and functional roles of the protein domains that comprise these unique photoreceptors. Here, we perform comparative analyses of transgenic lines constitutively expressing the photoreceptor LOV domain or the Kelch repeat protein-protein interaction domains of ZTL, FKF1, and LKP2. Expression of each domain alone is sufficient to disrupt circadian rhythms and flowering time, but each domain differs in the magnitude of effect. Immunoprecipitation followed by mass spectrometry with the ZTL Kelch repeat domain identified a suite of potential interacting partners. Furthermore, the ZTL Kelch repeat domain can interact with the ZTL homologs, LKP2 and FKF1, and the LOV domain of ZTL itself. This suggests a hypothesis that the Kelch repeat domain of ZTL may mediate inter- and intra-molecular interactions of the three LOV/F-box/Kelch proteins and provides added insight into the composition of the protein complexes and an additional role for the Kelch repeat domain.
DOI: 10.1105/tpc.109.072843
发表时间: 2010-03-01
期刊: PLANT CELL
影响因子: 11.6
作者:
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发表时间: 2019-04-05
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发表时间: 2017-02-23
影响因子: 16.6
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发表时间: 2005-08-01
影响因子: 4.9
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通讯作者: Kiyosue, T