A novel Crumbs3 isoform regulates cell division and ciliogenesis via importin beta interactions.

A novel Crumbs3 isoform regulates cell division and ciliogenesis via importin beta interactions.
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DOI:
10.1083/jcb.200609096
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发表时间:
2007-07-30
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Margolis B
Margolis B
中科院分区:
其他
文献类型:
--
作者:
Fan S;Fogg V;Wang Q;Chen XW;Liu CJ;Margolis B

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Crumbs 顶端跨膜蛋白家族通过与保守 C 端序列 ERLI 的蛋白质相互作用来调节顶端基底极性。然而,哺乳动物 Crumbs 蛋白之一 Crumbs3 (CRB3) 具有另一种剪接形式,具有以 CLPI 结尾的新型 C 端序列 (CRB3-CLPI)。我们报告 CRB3-CLPI 定位于纤毛膜和有丝分裂纺锤体极的膜室。 CRB3-CLPI 的敲低会导致纤毛丧失以及与中心体和纺锤体异常相关的多核表型。通过蛋白质纯化,我们发现 CRB3-CLPI 以 Ran 调节的方式与导入蛋白 β-1 相互作用。在有丝分裂过程中,导入蛋白 β-1 与 CRB3-CLPI 共定位,显性失活形式的导入蛋白 β-1 与 CRB3-CLPI 敲低密切相关。敲除输入蛋白 β-1 会阻止 CRB3-CLPI 靶向纺锤体极。我们的数据表明,Crumbs 蛋白通过与输入蛋白的独特相互作用,在极化膜靶向和细胞分裂中发挥更大的作用。
The Crumbs family of apical transmembrane proteins regulates apicobasal polarity via protein interactions with a conserved C-terminal sequence, ERLI. However, one of the mammalian Crumbs proteins, Crumbs3 (CRB3) has an alternate splice form with a novel C-terminal sequence ending in CLPI (CRB3-CLPI). We report that CRB3-CLPI localizes to the cilia membrane and a membrane compartment at the mitotic spindle poles. Knockdown of CRB3-CLPI leads to both a loss of cilia and a multinuclear phenotype associated with centrosomal and spindle abnormalities. Using protein purification, we find that CRB3-CLPI interacts with importin β-1 in a Ran-regulated fashion. Importin β-1 colocalizes with CRB3-CLPI during mitosis, and a dominant-negative form of importin β-1 closely phenocopies CRB3-CLPI knockdown. Knockdown of importin β-1 blocks targeting of CRB3-CLPI to the spindle poles. Our data suggest an expanded role for Crumbs proteins in polarized membrane targeting and cell division via unique interactions with importin proteins.
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期刊: BIOESSAYS
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