LATS1/WARTS phosphorylates MYPT1 to counteract PLK1 and regulate mammalian mitotic progression.

LATS1/WARTS phosphorylates MYPT1 to counteract PLK1 and regulate mammalian mitotic progression.
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LATS1/WARTS磷酸化MyPT1以抵消PLK1并调节哺乳动物有丝分裂进展。

DOI:
10.1083/jcb.201110110
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发表时间:
2012-05-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Kuninaka S
Kuninaka S
中科院分区:
其他
文献类型:
--
作者:
Chiyoda T;Sugiyama N;Shimizu T;Naoe H;Kobayashi Y;Ishizawa J;Arima Y;Tsuda H;Ito M;Kaibuchi K;Aoki D;Ishihama Y;Saya H;Kuninaka S

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LATS 1/WARTS激酶与芽殖酵母有丝分裂出口网络信号传导一致,使MYPT 1磷酸酶磷酸化以控制G2 DNA损伤检查点处的PLK 1。在芽殖酵母的有丝分裂出口网络中,Dbf2激酶磷酸化并调节Cdc14磷酸酶。相比之下,没有LATS 1/WARTS激酶的磷酸酶底物,哺乳动物相当于Dbf2,已被报道。为了解决这一矛盾,我们使用LATS 1激酶进行磷酸化蛋白质组学筛选。筛选确定MYPT1(肌球蛋白磷酸酶靶向亚基1)作为LATS 1的新底物。LATS 1直接且优先磷酸化MYPT 1的丝氨酸445(S445)。MYPT1突变体(S445A)不能使PLK1(polike kinase 1)的Thr 210去磷酸化,从而激活PLK1。这表明LATS 1促进MYPT 1拮抗PLK 1活性。与此一致,LATS 1敲除小鼠的LATS 1耗尽的HeLa细胞或成纤维细胞显示PLK1活性增加。我们还发现脱氧核糖核酸(DNA)损伤诱导的LATS 1激活通过MYPT 1 S445磷酸化引起PLK 1抑制。此外,LATS 1敲减细胞在DNA损伤后显示减少的G2检查点阻滞。这些结果表明,LATS 1磷酸化的磷酸酶一样,酵母Dbf2,并证明了一个新的作用,LATS 1在控制PLK1在G2 DNA损伤检查点。
Showing convergence with budding yeast mitotic exit network signaling, the LATS1/WARTS kinase phosphorylates the MYPT1 phosphatase to control PLK1 at the G2 DNA damage checkpoint. In the mitotic exit network of budding yeast, Dbf2 kinase phosphorylates and regulates Cdc14 phosphatase. In contrast, no phosphatase substrates of LATS1/WARTS kinase, the mammalian equivalent of Dbf2, has been reported. To address this discrepancy, we performed phosphoproteomic screening using LATS1 kinase. Screening identified MYPT1 (myosin phosphatase–targeting subunit 1) as a new substrate for LATS1. LATS1 directly and preferentially phosphorylated serine 445 (S445) of MYPT1. An MYPT1 mutant (S445A) failed to dephosphorylate Thr 210 of PLK1 (pololike kinase 1), thereby activating PLK1. This suggests that LATS1 promotes MYPT1 to antagonize PLK1 activity. Consistent with this, LATS1-depleted HeLa cells or fibroblasts from LATS1 knockout mice showed increased PLK1 activity. We also found deoxyribonucleic acid (DNA) damage–induced LATS1 activation caused PLK1 suppression via the phosphorylation of MYPT1 S445. Furthermore, LATS1 knockdown cells showed reduced G2 checkpoint arrest after DNA damage. These results indicate that LATS1 phosphorylates a phosphatase as does the yeast Dbf2 and demonstrate a novel role of LATS1 in controlling PLK1 at the G2 DNA damage checkpoint.
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