The ubiquitin ligase HACE1 regulates Golgi membrane dynamics during the cell cycle.

The ubiquitin ligase HACE1 regulates Golgi membrane dynamics during the cell cycle.
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DOI:
10.1038/ncomms1509
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发表时间:
2011-10-11
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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在哺乳动物细胞分裂过程中,高尔基膜分成子细胞是通过受泛素化调节的独特分解和重组过程发生的。然而,泛素连接酶的身份尚不清楚。在这里,我们展示了与 E6-AP 羧基末端 (HECT) 结构域同源的泛素连接酶 HACE1 通过与 Rab 蛋白相互作用靶向高尔基体膜。 HACE1 在有丝分裂高尔基体解体中的泛素连接酶活性是后续有丝分裂后高尔基体膜融合所必需的。使用小干扰 RNA 耗尽 HACE1 或在细胞中表达失活的 HACE1 突变蛋白会损害有丝分裂后高尔基体膜融合。 HACE1 被鉴定为高尔基体定位的泛素连接酶,这提供了证据表明泛素在细胞周期期间高尔基体生物发生中发挥着关键作用。
Partitioning of the Golgi membrane into daughter cells during mammalian cell division occurs through a unique disassembly and reassembly process that is regulated by ubiquitination. However, the identity of the ubiquitin ligase is unknown. Here we show that the Homologous to the E6-AP Carboxyl Terminus (HECT) domain containing ubiquitin ligase HACE1 is targeted to the Golgi membrane through interactions with Rab proteins. The ubiquitin ligase activity of HACE1 in mitotic Golgi disassembly is required for subsequent postmitotic Golgi membrane fusion. Depletion of HACE1 using small interfering RNAs or expression of an inactive HACE1 mutant protein in cells impaired postmitotic Golgi membrane fusion. The identification of HACE1 as a Golgi-localized ubiquitin ligase provides evidence that ubiquitin has a critical role in Golgi biogenesis during the cell cycle.
DOI: 10.1046/j.1525-1500.1998.00054.x
发表时间: 1998-01-01
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