天津医药 ›› 2015, Vol. 43 ›› Issue (11): 1338-1341.doi: 10.11958/j.issn.0253-9896.2015.11.031

• 综述 • 上一篇    下一篇

MDMX CK1αp53 抑癌蛋白调节机制的研究进展

魏玺 1, 张晟 1, 高明 2△   

  1. 1天津医科大学肿瘤医院超声诊疗科, 国家肿瘤临床医学研究中心, 天津市 “肿瘤防治” 重点实验室 (邮编 300060), 2甲状腺颈部肿瘤科
  • 收稿日期:2015-06-09 修回日期:2015-07-02 出版日期:2015-11-15 发布日期:2015-11-15
  • 通讯作者: 高明 E-mail: gaoming68@aliyun.com E-mail:weixi198204@126.com
  • 作者简介:魏玺 (1982), 男, 医学博士, 主要从事超声分子诊断及分子生物学的研究
  • 基金资助:
    国家自然科学基金青年项目 (81401412

Research progress of regulation mechanism of MDMX and CK1α in p53 tumor suppressor protein

WEI Xi1ZHANG Sheng1GAO Ming2△#br#   

  1. 1 Department of Diagnostic and Therapeutic Ultrasonography, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin 300060, China2 Thyroid Cancer Department
  • Received:2015-06-09 Revised:2015-07-02 Published:2015-11-15 Online:2015-11-15
  • Contact: GAO Ming E-mail: gaoming68@aliyun.com E-mail:weixi198204@126.com

摘要: 作为抑癌蛋白, p53 参与了细胞内多种信号转导过程, 并在细胞周期调控、 细胞凋亡及衰老等过程中发挥了重要的作用。鼠双微基因 (murine double minuteMDM2 MDMX (又称 MDM4murine double minute 4) 是 p53 个重要的调控因子。其中, MDMX 能够通过与 p53 蛋白的相互作用以及转录后修饰来调节 p53 蛋白功能。虽然MDMX MDM2 蛋白结构同源, 但是由于 MDMX 缺少 E3 连接酶, 因此无法介导 p53 蛋白的降解。然而, MDMX 身能够通过分子内部结构的折叠与展开, 与 p53 蛋白相互作用后调节其活性。在该过程中, MDMX 的主要分子伴侣——CK1αcasein kinase 1 alpha)通过磷酸化 MDMX 并干扰其分子内部结合, 从而协同调节 p53 蛋白。因而,MDMX CK1αp53 蛋白的调节是一个多步骤、 多因素参与的复杂过程。本文拟就 MDMX 以及CK1αp53 蛋白的具体调节机制进行综述。

关键词: 肿瘤抑制蛋白质 p53, 酪蛋白激酶 , p53 蛋白, MDMX

Abstract: As a tumor suppressor, p53 is activated by numerous cellular and environmental signals, and plays a critical role in the cell cycle regulation, cell apoptosis and senenscence. The murine double minute (MDM)2 and double minute murine 4 (MDMX) are two important regulators. MDMX is a p53 binding protein with strong sequence homology to MDM2, but lacks ubiquitin ligase activity, and which is unable to target p53 for proteasomal degradation. MDMX regulates p53 activity
through its binding with p53 and its postranscriptional modification. MDMX in the closed and open structure binds to p53 to regulate its activity. As the main partner of MDMX, casein kinase 1 alpha (CK1α) disrupts the intramolecular binding in MDMX in the cooperation to regulate p53 activity. The process of MDMX and CK1α in the regulation of p53 is multi-step and complicated. In this paper the mechanism of MDMX and CK1α in the regulation of p53 protein was reviewed.


Key words: tumor suppressor protein p53, casein kinase 1 alpha, p53, murine double minute 4