天津医药
天津醫藥
천진의약
Tianjin Medical Journal
2015年
11期
1338-1341
,共4页
肿瘤抑制蛋白质p53%酪蛋白激酶1α%p53蛋白%MDMX
腫瘤抑製蛋白質p53%酪蛋白激酶1α%p53蛋白%MDMX
종류억제단백질p53%락단백격매1α%p53단백%MDMX
tumor suppressor protein p53%casein kinase 1 alpha%p53%murine double minute 4
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 minute,MDM)2和MDMX(又称MDM4,murine double minute 4)是p53两个重要的调控因子。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与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本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——CK1α(casein 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及CK1α对p53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CK1α对p53蛋白的具体调节机制进行综述。
作為抑癌蛋白,p53參與瞭細胞內多種信號轉導過程,併在細胞週期調控、細胞凋亡及衰老等過程中髮揮瞭重要的作用。鼠雙微基因(murine double minute,MDM)2和MDMX(又稱MDM4,murine double minute 4)是p53兩箇重要的調控因子。其中,MDMX能夠通過與p53蛋白的相互作用以及轉錄後脩飾來調節p53蛋白功能。雖然MDMX與MDM2蛋白結構同源,但是由于MDMX缺少E3連接酶,因此無法介導p53蛋白的降解。然而,MDMX本身能夠通過分子內部結構的摺疊與展開,與p53蛋白相互作用後調節其活性。在該過程中,MDMX的主要分子伴侶——CK1α(casein kinase 1 alpha)通過燐痠化MDMX併榦擾其分子內部結閤,從而協同調節p53蛋白。因而, MDMX及CK1α對p53蛋白的調節是一箇多步驟、多因素參與的複雜過程。本文擬就MDMX以及CK1α對p53蛋白的具體調節機製進行綜述。
작위억암단백,p53삼여료세포내다충신호전도과정,병재세포주기조공、세포조망급쇠로등과정중발휘료중요적작용。서쌍미기인(murine double minute,MDM)2화MDMX(우칭MDM4,murine double minute 4)시p53량개중요적조공인자。기중,MDMX능구통과여p53단백적상호작용이급전록후수식래조절p53단백공능。수연MDMX여MDM2단백결구동원,단시유우MDMX결소E3련접매,인차무법개도p53단백적강해。연이,MDMX본신능구통과분자내부결구적절첩여전개,여p53단백상호작용후조절기활성。재해과정중,MDMX적주요분자반려——CK1α(casein kinase 1 alpha)통과린산화MDMX병간우기분자내부결합,종이협동조절p53단백。인이, MDMX급CK1α대p53단백적조절시일개다보취、다인소삼여적복잡과정。본문의취MDMX이급CK1α대p53단백적구체조절궤제진행종술。
As a tumor suppressor, p53 is activated by numerous cellular and environmental signals, and plays a criticalrole in the cell cycle regulation, cell apoptosis and senenscence. The murine double minute (MDM)2 and double minute mu?rine 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 MD?MX in the cooperation to regulate p53 activity. The process of MDMX and CK1αin the regulation of p53 is multi-step and complicated. In this paper the mechanism of MDMX and CK1αin the regulation of p53 protein was reviewed.