Conserved sequence repeats of IQGAP1 mediate binding to Ezrin.

Conserved sequence repeats of IQGAP1 mediate binding to Ezrin.
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IQGAP1 的保守序列重复介导与 Ezrin 的结合。

DOI:
10.1021/pr400787p
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发表时间:
2014
影响因子:
4.4
通讯作者:
Worthylake,DavidK
Worthylake,DavidK
中科院分区:
生物学2区
文献类型:
--
作者:
Liu,Jing;Guidry,JesseJ;Worthylake,DavidK

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哺乳动物IQGAP蛋白在其N端附近都有多个∼50氨基酸序列重复,对这些重复序列的功能知之甚少。我们表达并纯化了人IQGAP1的重复序列,以确定结合伙伴。我们使用质谱仪鉴定了42个与IQGAP1重复序列相关的小鼠肾脏蛋白,包括ERM蛋白Ezrin、Radixin和moesin。ERM蛋白有一个N-末端的FERM结构域(4.1,Ezrin,Radix,moesin),通过它它们与蛋白质靶标、磷脂酰肌醇4,5-二磷酸(PIP2)和C-末端的肌动蛋白结合域结合,并将肌动蛋白细胞骨架连接到细胞皮质上的不同位置。等温滴定热法(ITC)显示,IQGAP1重复序列直接与Ezrin费米结构域结合,而不与全长“自抑制”Ezrin或旨在模拟激活蛋白的全长Ezrin结合。ITC还表明,Ezrin ferm结构域与IQGAP2的重复序列结合,但不与IQGAP3的重复序列结合。我们认为,IQGAP1和IQGAP2通过ERM蛋白定位于细胞皮质。我们认为,出于信号传递的目的,IQGAP3重复序列也可能与FERM结构域结合。
Mammalian IQGAP proteins all feature multiple ∼50 amino acid sequence repeats near their N-termini, and little is known about the function of these “Repeats”. We have expressed and purified the Repeats from human IQGAP1 to identify binding partners. We used mass spectrometry to identify 42 mouse kidney proteins that associate with the IQGAP1 Repeats including the ERM proteins ezrin, radixin, and moesin. ERM proteins have an N-terminal FERM domain (4.1, ezrin, radixin, moesin) through which they bind to protein targets and phosphatidylinositol 4,5-bisphosphate (PIP2) and a C-terminal actin-binding domain and function to link the actin cytoskeleton to distinct locations on the cell cortex. Isothermal titration calorimetry (ITC) reveals that the IQGAP1 Repeats directly bind to the ezrin FERM domain, while no binding is seen for full-length “autoinhibited” ezrin or a version of full-length ezrin intended to mimic the activated protein. ITC also indicates that the ezrin FERM domain binds to the Repeats from IQGAP2 but not the Repeats from IQGAP3. We conclude that IQGAP1 and IQGAP2 are positioned at the cell cortex by ERM proteins. We propose that the IQGAP3 Repeats may likewise bind to FERM domains for signaling purposes.
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