Tip110 interacts with YB-1 and regulates each other's function.

Tip110 interacts with YB-1 and regulates each other's function.
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DOI:
10.1186/1471-2199-14-14
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发表时间:
2013-07-04
影响因子:
--
通讯作者:
He JJ
He JJ
中科院分区:
生物3区
文献类型:
--
作者:
Timani KA;Liu Y;He JJ

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Tip110在肿瘤免疫生物学、前mRNA剪接、病毒和宿主基因的表达调控以及可能的蛋白质周转等方面发挥着重要作用。很明显,我们对Tip110生物学功能的理解仍然不完整。在此,我们采用了一种基于免疫亲和力的富集法结合蛋白质质谱仪,并试图鉴定与Tip110相互作用的细胞蛋白。共鉴定出13种主要蛋白质与Tip110形成复合体。其中包括Y-box结合蛋白1(YB-1)。进一步剖析了Tip110与YB-1的相互作用,证实Tip110与YB-1的相互作用是特异的,涉及Tip110和YB-1蛋白的N端。选择HIV-1LTR启动子驱动的报告基因实验和CD44微小基因体内剪接实验来评估Tip110/YB-1相互作用的功能相关性。我们发现YB-1增强了Tip110/Tat介导的HIV-1 LTR启动子的反式激活,而Tip110促进了CD44微型基因选择性剪接中外显子5的包含。Tip110和YB-1相互作用形成复合体,相互调节彼此的生物学功能。
Tip110 plays important roles in tumor immunobiology, pre-mRNA splicing, expression regulation of viral and host genes, and possibly protein turnover. It is clear that our understanding of Tip110 biological function remains incomplete. Herein, we employed an immunoaffinity-based enrichment approach combined with protein mass spectrometry and attempted to identify Tip110-interacting cellular proteins. A total of 13 major proteins were identified to be complexed with Tip110. Among them was Y-box binding protein 1 (YB-1). The interaction of Tip110 with YB-1 was further dissected and confirmed to be specific and involve the N-terminal of both Tip110 and YB-1 proteins. A HIV-1 LTR promoter-driven reporter gene assay and a CD44 minigene in vivo splicing assay were chosen to evaluate the functional relevance of the Tip110/YB-1 interaction. We showed that YB-1 potentiates the Tip110/Tat-mediated transactivation of the HIV-1 LTR promoter while Tip110 promotes the inclusion of the exon 5 in CD44 minigene alternative splicing. Tip110 and YB-1 interact to form a complex and mutually regulate each other’s biological functions.
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