Alternatively spliced exon 5 of the FERM domain of protein 4.1R encodes a novel binding site for erythrocyte p55 and is critical for membrane targeting in epithelial cells.

Alternatively spliced exon 5 of the FERM domain of protein 4.1R encodes a novel binding site for erythrocyte p55 and is critical for membrane targeting in epithelial cells.
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蛋白质 4.1R FERM 结构域的选择性剪接外显子 5 编码红细胞 p55 的新结合位点,对于上皮细胞中的膜靶向至关重要。

DOI:
10.1016/j.bbamcr.2008.09.012
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发表时间:
2009
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Chishti,AtharH
Chishti,AtharH
中科院分区:
--
文献类型:
--
作者:
Seo,Pil-Soo;Jeong,Jong-Jin;Zeng,Lixiao;Takoudis,ChristosG;Quinn,BrendanJ;Khan,AnwarA;Hanada,Toshihiko;Chishti,AtharH

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MAGUK 与肌动蛋白细胞骨架的直接物理连接首先是通过红细胞 p55 与蛋白 4.1R 的 FERM 结构域的相互作用建立的。随后,据报道,p55 与位于蛋白质 4.1R 的 FERM 结构域内的外显子 10 编码的 51 个氨基酸肽结合。在这项研究中,我们研究了 p55-FERM 结构域结合界面的性质,并表明 p55 与第二个 35 个氨基酸的肽结合,该肽由位于蛋白质 4.1R 的 FERM 结构域内的可变剪接外显子 5 编码。竞争和表面等离子共振结合测量表明,外显子 5 和 10 编码的肽与 p55 D5 结构域内的独立位点结合。有趣的是,含有外显子 5 和 10 的全长 135 kDa 蛋白 4.1R 异构体专门针对上皮细胞的质膜,而没有外显子 5 的相同异构体完全丧失了其膜定位能力。总之,这些结果表明 p55 与 FERM 结构域内的两个不同位点结合,并且可变剪接的外显子 5 对于上皮细胞中蛋白 4.1R 的膜靶向是必需的。由于与蛋白质 4.1R 的外显子 5 肽和 p55 的 D5 结构域相似的序列在许多蛋白质中都是保守的,因此我们的研究结果表明,类似的机制可能控制其他含有 FERM 结构域的蛋白质的膜靶向。
Direct physical linkage of MAGUKs to the actin cytoskeleton was first established by the interaction of erythrocyte p55 with the FERM domain of protein 4.1R. Subsequently, it was reported that p55 binds to a 51-amino acid peptide, encoded by exon 10, located within the FERM domain of protein 4.1R. In this study, we investigated the nature of the p55–FERM domain binding interface and show that p55 binds to a second 35-amino acid peptide, encoded by an alternatively spliced exon 5, located within the FERM domain of protein 4.1R. Competition and Surface Plasmon Resonance-binding measurements suggest that the peptides encoded by exons 5 and 10 bind to independent sites within the D5 domain of p55. Interestingly, the full length 135 kDa isoform of protein 4.1R containing both exons 5 and 10 was targeted exclusively to the plasma membrane of epithelial cells whereas the same isoform without exon 5 completely lost its membrane localization capacity. Together, these results indicate that p55 binds to two distinct sites within the FERM domain, and the alternatively spliced exon 5 is necessary for the membrane targeting of protein 4.1R in epithelial cells. Since sequences similar to the exon 5-peptide of protein 4.1R and D5 domain of p55 are conserved in many proteins, our findings suggest that a similar mechanism may govern the membrane targeting of other FERM domain containing proteins.
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