NtKRP, a kinesin-12 protein, regulates embryo/seed size and seed germination via involving in cell cycle progression at the G2/M transition.

NtKRP, a kinesin-12 protein, regulates embryo/seed size and seed germination via involving in cell cycle progression at the G2/M transition.
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NtKRP 是一种驱动蛋白 12 蛋白,通过参与 G2/M 转变的细胞周期进程来调节胚胎/种子大小和种子萌发

DOI:
10.1038/srep35641
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发表时间:
2016-10-25
期刊:
影响因子:
4.6
通讯作者:
Sun MX
Sun MX
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Tian S;Wu J;Li F;Zou J;Liu Y;Zhou B;Bai Y;Sun MX

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运动蛋白是一个基于微管的运动蛋白超家族,参与植物发育的基本过程,但很少有运动蛋白在种子发育过程中被鉴定出功能。特别是在胚胎发生过程中,很少有调节细胞分裂的驱动蛋白被发现。在这里,我们报道了NtKRP的功能表征,NtKRP是kinesin-12家族的一种运动蛋白。ntkrpi主要在胚胎和胚胎根中表达。NtKRPRNAi系显示分生组织区、胚胎根长、成熟胚和种子大小的细胞数量减少。此外,我们还证明了CDKA;1在公认的磷酸化位点与NtKRP结合,并且在NtKRP沉默的胚胎中细胞数量的减少是由于G2/M转变时细胞分裂周期的延迟。此外,NtKRP的载货结合尾域与CDKA之间的结合;我也下定决心了。我们的研究结果揭示了一种新的调控胚胎/种子发育的分子途径,以及驱动蛋白在胚胎发育特定问题的时空调控中的关键作用。
Kinesins comprise a superfamily of microtubule-based motor proteins involved in essential processes in plant development, but few kinesins have been functionally identified during seed development. Especially, few kinesins that regulate cell division during embryogenesis have been identified. Here we report the functional characterization of NtKRP, a motor protein of the kinesin-12 family.NtKRPis predominantly expressed in embryos and embryonic roots.NtKRPRNAi lines displayed reductions in cell numbers in the meristematic zone, in embryonic root length, and in mature embryo and seed sizes. Furthermore, we also show that CDKA;1 binds to NtKRP at the consensus phosphorylation sites and that the decreased cell numbers inNtKRP-silenced embryos are due to a delay in cell division cycle at the G2/M transition. In addition, binding between the cargo-binding tail domain of NtKRP and CDKA; 1 was also determined. Our results reveal a novel molecular pathway that regulates embryo/seed development and critical role of kinesin in temporal and spatial regulation of a specific issue of embryo developmental.
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