项目名称: 蛋白激酶CyclinE/CDK2调控去甲基化酶PHF8的机制及生物学意义
项目编号: No.31471278
项目类型: 面上项目
立项/批准年度: 2015
项目学科: 生物科学
项目作者: 叶昕
作者单位: 中国科学院微生物研究所
项目金额: 80万元
中文摘要: 蛋白激酶CyclinE/CDK2在细胞周期调控中发挥重要作用。我们通过串联亲和纯化技术筛选到与CyclinE/CDK2 互作的新蛋白-组蛋白去甲基化酶PHF8;初步研究表明它能被CyclinE/CDK2磷酸化。为了阐明CyclinE/CDK2磷酸化PHF8在细胞周期调控中的作用及其生物学意义,我们拟进行以下研究:1、通过质谱分析,定位CyclinE/CDK2磷酸化PHF8的位点;然后分析CyclinE/CDK2对于PHF8的磷酸化是否影响其去甲基化酶活性;2、通过流式细胞术等方法,研究PHF8是否协同CyclinE/CDK2参与细胞周期的调节,以及PHF8的磷酸化是否影响细胞周期G1/S期的转换;3、通过RNA深度测序技术, 比较PHF8 及其磷酸化对细胞周期相关基因转录的影响,探究PHF8调控基因表达的机制;4、通过小鼠模型以及临床样本分析,研究PHF8及其磷酸化与肿瘤发生的相关性。
中文关键词: 细胞周期调控;蛋白激酶CyclinE/CDK2;去甲基化酶PHF8;磷酸化;去甲基化
英文摘要: Protein kinase cyclinE/CDK2 plays an important role in G1/S transition during cell cycle. By taking the approach of TAP-tagged purification technique, we identified a novel cyclinE/CDK2 substrate called PHF8 which is a histone demethylase. Our preliminary data showed that PHF8 can interact with cyclinE/CDK2 and be phosphorylated by cyclinE/CDK2. In order to further elucidate the biological significance of PFH8 phosphorylation by cyclinE/CDK2 and its effect on cell cycle progression, we propose to study the following aspects: 1. To identify the phosphorylation site of PHF8 by cyclinE/CDK2 using mass spectrometry; to generate PHF8 mutants and analyze whether phosphorylation of PHF8 by cyclinE/CDK2 effects its localization and demethylase activity; 2. To examine whether the phosphorylation status of PHF8 influences the cell cycle progression by using flow cytometry analysis; to investigate whether PHF8 coordinates with CyclinE/CDK2 in regulating DNA replication and G1/S transition; 3. To generate the inducible cells for PHF8 or its mutants, and examine whether the phosphorylation of PHF8 affects cell cycle related gene transcription; 4. To analyze if there is any correlation between the expression level and the phosphosphorylation of PHF8 and the tumorigenesis.
英文关键词: Cell cycle;CyclinE/CDK2;PHF8;phosphorylation;demethylation