TRANSFORMATION SPECIFIC SIGNALING MEDIATED BY VERBS

由动词介导的转换特定信号

• 批准号: 2382821
• 负责人: MICHAEL J MCMANUS
• 金额: $ 9.22万
• 依托单位: MAYO CLINIC ROCHESTER
• 依托单位国家: 美国
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-20 至 2002-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2382821
• 关键词: affinity chromatography; biological signal transduction; caldesmon; carcinogenesis; chick embryo; fibroblasts; laboratory mouse; laboratory rabbit; molecular cloning; oncogenes; oncoproteins; phosphorylation; protein purification; protein structure function; protein tyrosine kinase; recombinant virus; site directed mutagenesis; transfection; virus genetics; western blottings

DESCRIPTION: The v-erbB oncogene of the avian erythroblastosis virus encodes a truncated growth factor receptor with tyrosine kinase activity. Expression of this viral oncogene causes fibrosarcomas, erythroleukemias and hemangiosarcomas. Understanding the mechanisms of signal transduction by the v-ErbB oncoprotein will offer insights into tyrosine kinase signal transduction pathways, into the formation of transformation-specific multiprotein complexes, and has great potential to offer insights into the molecular biology of human malignancies. With these long-term goals in mind, the experiments outlined in this proposal will use well-characterized, transformation-specific, structural mutants of v-ErbB to dissect tyrosine kinase signaling pathways in transformed fibroblasts. This approach has already revealed the formation of a transformation-specific multiprotein signaling complex in v-ErbB transformed fibroblasts. This complex is composed of two signal adapter molecules (SHC and GRB2), a guanine nucleotide exchange factor (SOS), a tyrosine phosphorylated form of the cytoskeletal regulatory protein caldesmon, and a novel tyrosine phosphorylated protein (pp75). The hypothesis to be tested is that the oncogenic signals initiated by v-ErbB are transduced through the SHC-GRB2-SOS-caldesmon-pp75 complex, and that tyrosine phosphorylated caldesmon and pp75 participate in the regulation of anchorage-independent growth and tumorigenicity. The specific aims of this study are to (I) determine the mechanism of association of caldesmon with the multiprotein complex, (ii) define the functional role of caldesmon in v-ErbB mediated transformation, and (iii) characterize the novel 75 kd tyrosine phosphorylated protein in this signaling complex.

描述：禽成红细胞增多症病毒的 v-erbB 癌基因 编码具有酪氨酸激酶活性的截短生长因子受体。 这种病毒癌基因的表达会导致纤维肉瘤、红白血病和 血管肉瘤。 了解信号转导机制 v-ErbB 癌蛋白将提供对酪氨酸激酶信号的深入了解 转导途径，形成转化特异性 多蛋白复合物，并且具有提供深入了解的巨大潜力 人类恶性肿瘤的分子生物学。 有了这些长期目标 请注意，本提案中概述的实验将使用特征良好的、 v-ErbB 的转化特异性结构突变体可解析酪氨酸 转化成纤维细胞中的激酶信号传导途径。 这种方法有 已经揭示了转化特异性多蛋白的形成 v-ErbB 转化的成纤维细胞中的信号复合物。 这个综合体是 由两个信号接头分子（SHC 和 GRB2）组成，一个是鸟嘌呤 核苷酸交换因子（SOS），酪氨酸磷酸化形式 细胞骨架调节蛋白 caldesmon 和一种新型酪氨酸 磷酸化蛋白（pp75）。 要检验的假设是 由 v-ErbB 启动的致癌信号通过 SHC-GRB2-SOS-caldesmon-pp75 复合物，酪氨酸磷酸化 caldesmon 和 pp75 参与锚定无关的调节 生长和致瘤性。 本研究的具体目的是（一） 确定caldesmon与多蛋白的关联机制 复杂，(ii) 定义 caldesmon 在 v-ErbB 介导中的功能作用 转化，以及 (iii) 表征新型 75 kd 酪氨酸 该信号复合物中的磷酸化蛋白。