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Regulation of cell migration and signaling by phosphotyrosine and ubiquitin

磷酸酪氨酸和泛素对细胞迁移和信号传导的调节

基本信息

批准号：
9067447
负责人：
Jonathan A Cooper
金额：
$ 33.81万
依托单位：
FRED HUTCHINSON CANCER RESEARCH CENTER
依托单位国家：
美国
项目类别：
财政年份：
2014
资助国家：
美国
起止时间：
2014-08-01 至 2018-05-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/9067447
关键词：
Address BCAR1 gene Binding Proteins CISH gene Cell Communication Cell Proliferation Cells Cellular biology Complex Cullin 5 Protein Epithelial Cells Epithelium Family Fibroblasts Figs - dietary Focal Adhesions Genes Health Human Immigration Immunity Individual Lead Ligase Link Malignant Neoplasms Mitogens Modeling Molecular Morphology Neurons Phosphorylation Phosphotyrosine Post-Translational Protein Processing Prevalence Protein Dephosphorylation Protein Tyrosine Phosphatase Proteins Regulation Research Role Signal Transduction System Techniques Testing Tumor Suppressor Proteins Tyrosine Phosphorylation Ubiquitin Work Wound Healing adhesion receptor cancer cell cell motility cell transformation cell type in vitro Assay inhibitor/antagonist migration multicatalytic endopeptidase complex novel protein degradation protein protein interaction src-Family Kinases ubiquitin ligase ubiquitin-protein ligase

项目摘要

DESCRIPTION (provided by applicant): Cell migration is regulated by signals from cell-cell interactions, cell-matrix interactions and chemo-attractants and -repellants. Such signals are transduced and coordinated by cascades of post-translational modifications and protein-protein interactions. Specifically, Src family tyrosine kinases are activated by mitogens and adhesion receptors and phosphorylate proteins that organize the leading edge and focal adhesions in migrating cells. The Cullin 5 RING (CRL5) E3 ubiquitin ligase and SOCS proteins (phosphotyrosine-dependent substrate adaptors for CRL5) have been implicated as potential tumor suppressors. We have found that SOCS-CRL5 complexes regulate Src activity, cell migration, proliferation and/or transformation in several cell types. Inhibiting the expression of SOCS proteins or Cul5 in epithelial cells stimulates migration, proliferation, and Src kinase activity. Increased Src is necessary but not sufficient for the increased migration and proliferation of CRL5-deficient cells, suggesting that SOCS-CRL5 complexes have additional substrates. We propose three broad aims to understand in depth how CRL5 regulates Src and cell migration. First, we will determine how CRL5 regulates Src activity. Second, we will identify CRL5 substrates, focusing on those that contain phosphotyrosine, and test which substrates regulate cell migration and proliferation. Third, we will dissect the mechanisms by which SOCS proteins and substrates coordinate focal adhesion and leading edge dynamics during cell migration. Collectively, our research will show how protein-tyrosine phosphorylation and ubiquitylation cooperate to regulate cell biology.

描述(申请人提供)：细胞迁移受来自细胞-细胞相互作用、细胞-基质相互作用和化学诱导剂和驱避剂的信号调节。这些信号通过翻译后修饰和蛋白质-蛋白质相互作用的级联来传递和协调。具体地说，Src家族酪氨酸激酶被丝裂原、黏附受体和磷酸化蛋白质激活，这些蛋白质组织了迁移细胞中的前沿黏附和局部黏附。库林5环(CRL5)E3泛素连接酶和SOCS蛋白(CRL5的磷酸酪氨酸依赖底物适配器)被认为是潜在的肿瘤抑制因子。我们已经发现SOCS-CRL5复合体在多种细胞类型中调节Src的活性、细胞的迁移、增殖和/或转化。抑制上皮细胞中SOCS蛋白或Cul5的表达可刺激细胞的迁移、增殖和Src激酶活性。增加的Src对于CRL5缺陷细胞的迁移和增殖是必要的，但不是充分的，这表明SOCS-CRL5复合体有额外的底物。为了深入了解CRL5是如何调控Src和细胞迁移的，我们提出了三个广泛的目标。首先，我们将确定CRL5是如何调节Src活性的。其次，我们将确定CRL5底物，重点是那些含有磷酸酪氨酸的底物，并测试哪些底物调节细胞迁移和增殖。第三，我们将剖析SOCS蛋白和底物在细胞迁移过程中协调焦点黏附和前沿动态的机制。总而言之，我们的研究将展示蛋白质酪氨酸磷酸化和泛素化如何协同调节细胞生物学。