Cutaneous papillomavirus E6 oncoproteins associate with MAML1 to repress transactivation and NOTCH signaling.

Cutaneous papillomavirus E6 oncoproteins associate with MAML1 to repress transactivation and NOTCH signaling.
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DOI:
10.1038/onc.2011.589
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发表时间:
2012-10-25
期刊:
影响因子:
8
通讯作者:
Vande Pol, S. B.
Vande Pol, S. B.
中科院分区:
医学1区
文献类型:
--
作者:
Brimer, N.;Lyons, C.;Wallberg, A. E.;Vande Pol, S. B.

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乳头瘤病毒E6癌蛋白与靶细胞蛋白上的LXXLL基序结合以改变其功能。使用蛋白质组学方法,我们发现皮肤乳头瘤病毒牛乳头瘤病毒1型(BE 6)和HPV 1型和8型(1 E6和8 E6)的E6癌蛋白与MAML 1转录辅激活因子相关。所有三种E6蛋白结合MAML 1羧基末端的酸性LXXLL基序,并抑制MAML 1的反式激活。MAML 1最为人所知的是作为NOTCH诱导的转录的共激活剂和效应子,BPV-1 E6抑制合成的NOTCH应答启动子、内源性NOTCH应答启动子,并且在稳定转化的细胞中与MAML 1形成复合物。BPV-1诱导的乳头状瘤表现出抑制NOTCH信号转导的特征,包括整合素、talin和基底型角蛋白的基底上表达,以及NOTCH依赖性HES 1转录因子的延迟表达。这些观察结果产生了一种模型,其中乳头瘤病毒癌蛋白包括BPV-1 E6和癌症相关的HPV-8 E6抑制Notch诱导的转录,从而延迟角质形成细胞分化。
Papillomavirus E6 oncoproteins associate with LXXLL motifs on target cellular proteins to alter their function. Using a proteomic approach, we found the E6 oncoproteins of cutaneous papillomaviruses Bovine Papillomavirus Type 1 (BE6) and HPV types 1 and 8 (1E6 and 8E6) associated with the MAML1 transcriptional co-activator. All three E6 proteins bind to an acidic LXXLL motif at the carboxy-terminus of MAML1 and repress transactivation by MAML1. MAML1 is best known as the co-activator and effector of NOTCH induced transcription, and BPV-1 E6 represses synthetic NOTCH responsive promoters, endogenous NOTCH responsive promoters, and is found in a complex with MAML1 in stably transformed cells. BPV-1 induced papillomas show characteristics of repressed NOTCH signal transduction, including suprabasal expression of integrins, talin, and basal type keratins, and delayed expression of the NOTCH dependent HES1 transcription factor. These observations give rise to a model whereby papillomavirus oncoproteins including BPV-1 E6 and the cancer associated HPV-8 E6 repress Notch induced transcription, thereby delaying keratinocyte differentiation.
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