在激活的B细胞中对Vav原型瘤基因产品的铁酸化
1Department of Molecular Biology, Bristol-Myers Squibb Pharmaceutical Research Institute, Princeton, NJ 08543-4000.
Science (New York, N.Y.)
|May 22, 1992
概括
乙淋巴细胞激活涉及p95vav的氨酸酸化,这是与vAV原瘤基因相关的蛋白质. 这种酸化和与Vap-1的关联是快速的,这表明Vap-1是快速的.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
背景情况:
- 乙淋巴细胞通过其免疫球蛋白M (IgM) 抗原受体被激活.
- 这种激活会触发细胞内信号级联,包括蛋白质氨酸酸化.
- 瓦夫原瘤基因产物p95vav是参与这些信号通路的关键蛋白质.
研究的目的:
- 调查p95vav在IgM受体参与时B淋巴细胞激活中的作用.
- 为了确定p95vav氨酸酸化的动力学和依赖性.
- 探索p95vav在B细胞激活过程中与其他信号分子的相互作用.
主要方法:
- 免疫球蛋白M (IgM) 在B淋巴细胞上的交叉链接.
- 使用特定抗体对蛋白质氨酸酸化的分析.
- 通过共免疫沉评估蛋白质与蛋白质相互作用.
- 研究Src同质性2 (SH2) 域在蛋白质相互作用中的作用.
主要成果:
- 在IgM交叉链接后,p95vav的氨酸酸化发生很快 (几秒钟内).
- p95vav酸化独立于蛋白激酶C激活,G蛋白信号传递和调动.
- 在大约5秒内,p95vav与70kDa的氨酸酸化蛋白Vap-1迅速结合.
- 这种关联是短暂的,持续约60秒,由p95vav的SH2域介导.
结论:
- vav原型瘤基因产物p95vav是B淋巴细胞抗原受体信号传导中的早期响应者.
- p95vav酸化及其与Vap-1的相互作用是B细胞激活的关键早期事件.
- 这些发现突显了vAV原瘤基因在调解抗原诱导的B淋巴细胞激活中的重要作用.
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