Characterization of mouse IFT complex B.

Characterization of mouse IFT complex B.
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小鼠IFT复合物的表征B。

DOI:
10.1002/cm.20346
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发表时间:
2009-08
影响因子:
--
通讯作者:
Pazour, Gregory J.
Pazour, Gregory J.
中科院分区:
其他
文献类型:
--
作者:
Follit, John A.;Xu, Fenghui;Keady, Brian T.;Pazour, Gregory J.

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初级纤毛在哺乳动物的发育和维持健康中起着关键作用。初级纤毛通过鞭毛内运输(IFT)过程组装和维持。在这项工作中,我们通过鉴定先前在衣藻和秀丽隐杆线虫中鉴定的复合物 B 和 B 相关蛋白的所有哺乳动物直系同源物来表征小鼠 IFT 复合物 B,并通过数据库分析鉴定复合物 B 的新成分 (IFT25/Hspb11)。我们用 FLAG 表位标记这些蛋白质中的每一个,并显示除 IFT172 和 IFT20 之外的所有蛋白质都定位于纤毛和纤毛基部的基周体或中心体区域。除 IFT172 之外的所有蛋白质都会免疫沉淀 IFT88,表明它们共组装成复合物。 IFT20 是唯一定位于高尔基体的复合 B 蛋白。然而,IFT54/Traf3ip1(Dyf-11/Elipsa 的小鼠直系同源物)的过度表达会取代高尔基体中的 IFT20。 IFT54 不定位于高尔基复合体,也不与 GMAP210 相互作用,GMAP210 是将 IFT20 锚定到高尔基体的蛋白质。这表明IFT54s对IFT20的影响是由其过度表达引起的显性负表型。
The primary cilium plays a key role in the development of mammals and in the maintenance of health. Primary cilia are assembled and maintained by the process of intraflagellar transport (IFT). In this work, we characterize mouse IFT complex B by identifying all of the mammalian orthologues of complex B and B-associated proteins previously identified in Chlamydomonas and Caenorhabditis and also identify a new component (IFT25/Hspb11) of complex B by database analysis. We tagged each of these proteins with the FLAG epitope and show that all except IFT172 and IFT20 localize to cilia and the peri-basal body or centrosomal region at the base of cilia. All of the proteins except IFT172 immunoprecipitate IFT88 indicating that they are co-assembled into a complex. IFT20 is the only complex B protein that localizes to the Golgi apparatus. However, overexpression of IFT54/Traf3ip1, the mouse orthologue of Dyf-11/Elipsa, displaces IFT20 from the Golgi apparatus. IFT54 does not localize to the Golgi complex nor does it interact with GMAP210, which is the protein that anchors IFT20 to the Golgi apparatus. This suggests that IFT54s effect on IFT20 is a dominant negative phenotype caused by its overexpression.
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发表时间: 2009-08
影响因子: --
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影响因子: 2.6
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影响因子: --
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