The BASL polarity protein controls a MAPK signaling feedback loop in asymmetric cell division.

The BASL polarity protein controls a MAPK signaling feedback loop in asymmetric cell division.
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DOI:
10.1016/j.devcel.2015.02.022
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发表时间:
2015-04-20
期刊:
影响因子:
11.8
通讯作者:
Dong, Juan
Dong, Juan
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang, Ying;Wang, Pengcheng;Shao, Wanchen;Zhu, Jian-Kang;Dong, Juan

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细胞极化与植物干细胞不对称分裂过程中的命运决定有关,但其潜在的分子机制尚不清楚。在拟南芥中,气孔线不对称性的打破(BASL)被极化以控制气孔不对称分裂。有丝分裂原激活蛋白激酶(MAPK)级联通过促进谱系决定子SPEECH(SPCH)的降解来决定气孔的最终命运。在这里,我们表明,BASL和MAPK通路之间的正反馈回路构成了一个极性模块在皮层。BASL的皮质定位需要MPK 3/6介导的磷酸化。磷酸化的BASL作为支架发挥作用,并招募MAPKKK YODA和MPK 3/6在皮质空间集中信号传导。活化的MPK 3/6通过磷酸化BASL来加强反馈回路,并通过磷酸化SPCH来抑制气孔命运。BASL-MAPK信号反馈模块的极化代表了植物干细胞不对称分裂过程中细胞极性与命运分化的联系机制。
Cell polarization is linked to fate determination during asymmetric division of plant stem cells, but the underlying molecular mechanisms remain unknown. In Arabidopsis, BREAKING OF ASYMMETRY IN THE STOMATAL LINEAGE (BASL) is polarized to control stomatal asymmetric division. A MITOGEN-ACTIVATED PROTEIN KINASE (MAPK) cascade determines terminal stomatal fate by promoting the degradation of the lineage determinant SPEECHLESS (SPCH). Here we demonstrate that a positive feedback loop between BASL and the MAPK pathway constitutes a polarity module at the cortex. Cortical localization of BASL requires phosphorylation mediated by MPK3/6. Phosphorylated BASL functions as a scaffold and recruits the MAPKKK YODA and MPK3/6 to spatially concentrate signaling at the cortex. Activated MPK3/6 reinforces the feedback loop by phosphorylating BASL, and inhibits stomatal fate by phosphorylating SPCH. Polarization of the BASL-MAPK signaling feedback module represents a mechanism connecting cell polarity to fate differentiation during asymmetric stem cell division in plants.
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