Identification of an Aurora-A/PinsLINKER/Dlg spindle orientation pathway using induced cell polarity in S2 cells.

Identification of an Aurora-A/PinsLINKER/Dlg spindle orientation pathway using induced cell polarity in S2 cells.
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DOI:
10.1016/j.cell.2009.07.041
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发表时间:
2009-09-18
期刊:
影响因子:
64.5
通讯作者:
Doe CQ
Doe CQ
中科院分区:
生物学1区
文献类型:
--
作者:
Johnston CA;Hirono K;Prehoda KE;Doe CQ

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不对称细胞分裂被深入研究,因为它可以产生细胞多样性以及维持干细胞群。不对称细胞分裂需要有丝分裂纺锤体与内在或外在极性线索对齐,但缺乏这一过程的机制细节。在这里,我们开发了一种方法来构建皮质极性在一个正常的非极化细胞系,并使用这种方法来表征合作伙伴的不可见(引脚; LGN/AGS 3在哺乳动物)依赖的纺锤体方向。我们确定了一个以前未被识别的进化保守的Pins结构域(PinsLINKER),它需要Aurora-A磷酸化来招募大圆盘(Dlg;哺乳动物中的PSD-95/hDlg)并促进部分纺锤体取向。良好表征的PinsTPR结构域没有单独的功能,但将PinsTPR顺式放置到PinsLINKER给出动力蛋白依赖的精确纺锤体取向。这种“诱导皮质极性”测定适用于快速鉴定调节纺锤体取向或细胞极性的蛋白质、结构域和氨基酸。
Asymmetric cell division is intensely studied because it can generate cellular diversity as well as maintain stem cell populations. Asymmetric cell division requires mitotic spindle alignment with intrinsic or extrinsic polarity cues, but mechanistic detail of this process is lacking. Here we develop a method to construct cortical polarity in a normally unpolarized cell line, and use this method to characterize Partner of Inscuteable (Pins; LGN/AGS3 in mammals)-dependent spindle orientation. We identify a previously unrecognized evolutionarily-conserved Pins domain (PinsLINKER) that requires Aurora-A phosphorylation to recruit Discs large (Dlg; PSD-95/hDlg in mammals) and promote partial spindle orientation. The well-characterized PinsTPR domain has no function alone, but placing the PinsTPR in cis to the PinsLINKER gives dynein-dependent precise spindle orientation. This "induced cortical polarity" assay is suitable for rapid identification of the proteins, domains, and amino acids regulating spindle orientation or cell polarity.
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影响因子: --
作者:
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通讯作者: Doe CQ