PLP inhibits the activity of interphase centrosomes to ensure their proper segregation in stem cells.

PLP inhibits the activity of interphase centrosomes to ensure their proper segregation in stem cells.
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DOI:
10.1083/jcb.201303141
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发表时间:
2013-09-30
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Rusan NM
Rusan NM
中科院分区:
其他
文献类型:
--
作者:
Lerit DA;Rusan NM

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PLP水平受Centrobin调节,并通过阻断波罗激酶的定位来抑制母体中心体成熟。中心体决定不对称分裂干细胞的有丝分裂轴。一些研究表明,果蝇中枢脑神经干细胞的中心体本身是不对称的,组织不同水平的中心粒周围物质和微管。这种不对称性在间期产生一个活性中心体和一个非活性中心体。我们确定了中心体周围蛋白样蛋白(PLP)作为一个负调节中心体成熟和活动。我们发现PLP富集在无活性的间期中心体上,在那里它阻断了中心体成熟的主要调节因子波罗激酶的募集。此外,我们发现异位Centrobin表达影响基底中心体上的PLP水平,这表明它可能在正常情况下起调节PLP的作用。最后,我们的结论是,虽然不对称的中心体成熟不需要不对称的细胞分裂,它是必要的适当的中心体分离到两个子细胞。
PLP levels are regulated by Centrobin and act to suppress mother centrosome maturation by blocking the localization of Polo kinase. Centrosomes determine the mitotic axis of asymmetrically dividing stem cells. Several studies have shown that the centrosomes of the Drosophila melanogaster central brain neural stem cells are themselves asymmetric, organizing varying levels of pericentriolar material and microtubules. This asymmetry produces one active and one inactive centrosome during interphase. We identify pericentrin-like protein (PLP) as a negative regulator of centrosome maturation and activity. We show that PLP is enriched on the inactive interphase centrosome, where it blocks recruitment of the master regulator of centrosome maturation, Polo kinase. Furthermore, we find that ectopic Centrobin expression influenced PLP levels on the basal centrosome, suggesting it may normally function to regulate PLP. Finally, we conclude that, although asymmetric centrosome maturation is not required for asymmetric cell division, it is required for proper centrosome segregation to the two daughter cells.
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