Phosphorylation of serine 106 in Asef2 regulates cell migration and adhesion turnover.

Phosphorylation of serine 106 in Asef2 regulates cell migration and adhesion turnover.
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DOI:
10.1021/pr5001384
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发表时间:
2014-07-03
影响因子:
4.4
通讯作者:
Webb, Donna J.
Webb, Donna J.
中科院分区:
生物学2区
文献类型:
--
作者:
Evans, J. Corey;Hines, Kelly M.;Forsythe, Jay G.;Erdogan, Begum;Shi, Mingjian;Hill, Salisha;Rose, Kristie L.;McLean, John A.;Webb, Donna J.

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Asef 2是一种由652个氨基酸组成的蛋白质,是一种鸟嘌呤核苷酸交换因子(GEF),通过激活Rho家族GTP酶(包括Rac)来调节细胞迁移和其他过程。已知肿瘤抑制剂腺瘤性息肉病(APC)与Asef 2的结合可诱导其GEF活性;然而,目前对Asef 2调控的其他模式知之甚少。在这里,我们研究了磷酸化在调节Asef 2活性和功能中的作用。使用高分辨率质谱(MS)和串联质谱(MS/MS),我们获得了所有磷酸化残基的完全覆盖,并确定了6个磷酸化位点。其中之一,丝氨酸106(S106),是特别有趣的一个潜在的调节Asef 2活性,因为它的位置在APC结合结构域。有趣的是,这种丝氨酸突变为丙氨酸(S106 A),一种不可磷酸化的类似物,大大降低了Asef 2激活Rac的能力,而磷酸模拟突变(丝氨酸突变为天冬氨酸,S106 D)增强了Rac的激活。此外,这些突变体在HT 1080细胞中的表达表明,S106的磷酸化对于Asef 2促进的迁移和细胞-基质粘附组装和拆卸(粘附周转)是至关重要的,这是一个促进有效迁移的过程。总的来说,我们的研究结果表明,S106的磷酸化调节Asef 2 GEF活性和Asef 2介导的细胞迁移和粘附周转。
Asef2, a 652-amino acid protein, is a guanine nucleotide exchange factor (GEF) that regulates cell migration and other processes via activation of Rho family GTPases, including Rac. Binding of the tumor suppressor adenomatous polyposis coli (APC) to Asef2 is known to induce its GEF activity; however, little is currently known about other modes of Asef2 regulation. Here, we investigated the role of phosphorylation in regulating Asef2 activity and function. Using high-resolution mass spectrometry (MS) and tandem mass spectrometry (MS/MS), we obtained complete coverage of all phosphorylatable residues and identified six phosphorylation sites. One of these, serine 106 (S106), was particularly intriguing as a potential regulator of Asef2 activity because of its location within the APC-binding domain. Interestingly, mutation of this serine to alanine (S106A), a non-phosphorylatable analogue, greatly diminished the ability of Asef2 to activate Rac, while a phosphomimetic mutation (serine to aspartic acid, S106D) enhanced Rac activation. Furthermore, expression of these mutants in HT1080 cells demonstrated that phosphorylation of S106 is critical for Asef2-promoted migration and for cell-matrix adhesion assembly and disassembly (adhesion turnover), which is a process that facilitates efficient migration. Collectively, our results show that phosphorylation of S106 modulates Asef2 GEF activity and Asef2-mediated cell migration and adhesion turnover.
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发表时间: 2001-06-25
期刊: The Journal of cell biology
影响因子: --
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