RanBP3 enhances nuclear export of active (beta)-catenin independently of CRM1.

RanBP3 enhances nuclear export of active (beta)-catenin independently of CRM1.
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RanBP3 独立于 CRM1 增强活性 (β)-连环蛋白的核输出。

DOI:
10.1083/jcb.200502141
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发表时间:
2005-12-05
影响因子:
7.8
通讯作者:
Fornerod, M
Fornerod, M
中科院分区:
生物学1区
文献类型:
--
作者:
Hendriksen, J;Fagotto, F;van der Velde, H;van Schie, M;Noordermeer, J;Fornerod, M

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β-连环蛋白是Wnt信号级联的核效应子。β-连环蛋白的核活性调节机制尚未明确。因此,我们使用核标记物RanGTP来筛选新的核β-catenin结合蛋白。我们鉴定了染色体区域维持1(CRM 1)介导的核输出的辅因子Ran结合蛋白3(RanBP 3),其作为一种新的β-连环蛋白相互作用蛋白,以RanGTP刺激的方式直接结合β-连环蛋白。RanBP 3抑制Wnt 1和β-连环蛋白刺激的人细胞中β-连环蛋白介导的转录激活。在非洲爪蟾胚胎中,RanBP 3干扰β-连环蛋白诱导的背腹轴形成。此外,RanBP 3耗竭刺激人细胞和果蝇胚胎中的Wnt途径。在人类细胞中,这伴随着细胞核中去磷酸化β-连环蛋白的增加。相反,RanBP 3的过表达导致活性β-连环蛋白向细胞质转移。RanBP 3对β-连环蛋白活性和定位的调节不依赖于腺瘤性结肠息肉病蛋白和CRM 1。我们的结论是RanBP 3是β-catenin的直接输出增强子,独立于其作为CRM 1相关核输出辅因子的作用。
β-Catenin is the nuclear effector of the Wnt signaling cascade. The mechanism by which nuclear activity of β-catenin is regulated is not well defined. Therefore, we used the nuclear marker RanGTP to screen for novel nuclear β-catenin binding proteins. We identified a cofactor of chromosome region maintenance 1 (CRM1)–mediated nuclear export, Ran binding protein 3 (RanBP3), as a novel β-catenin–interacting protein that binds directly to β-catenin in a RanGTP-stimulated manner. RanBP3 inhibits β-catenin–mediated transcriptional activation in both Wnt1- and β-catenin–stimulated human cells. In Xenopus laevis embryos, RanBP3 interferes with β-catenin–induced dorsoventral axis formation. Furthermore, RanBP3 depletion stimulates the Wnt pathway in both human cells and Drosophila melanogaster embryos. In human cells, this is accompanied by an increase of dephosphorylated β-catenin in the nucleus. Conversely, overexpression of RanBP3 leads to a shift of active β-catenin toward the cytoplasm. Modulation of β-catenin activity and localization by RanBP3 is independent of adenomatous polyposis coli protein and CRM1. We conclude that RanBP3 is a direct export enhancer for β-catenin, independent of its role as a CRM1-associated nuclear export cofactor.
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