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基于结构的破坏人乳头瘤病毒16型E6功能的黄酮类化合物的鉴定与表征

Structure based identification and characterization of flavonoids that disrupt human papillomavirus-16 E6 function.

作者信息

Cherry Jonathan J, Rietz Anne, Malinkevich Anna, Liu Yuqi, Xie Meng, Bartolowits Matthew, Davisson V Jo, Baleja James D, Androphy Elliot J

机构信息

Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America ; Department of Dermatology, Indiana University School of Medicine, Indianapolis, Indiana, United States of America.

Department of Dermatology, Indiana University School of Medicine, Indianapolis, Indiana, United States of America.

出版信息

PLoS One. 2013 Dec 23;8(12):e84506. doi: 10.1371/journal.pone.0084506. eCollection 2013.

Abstract

Expression and function of the human papillomavirus (HPV) early protein 6 (E6) is necessary for viral replication and oncogenesis in cervical cancers. HPV E6 targets the tumor suppressor protein p53 for degradation. To achieve this, "high-risk" HPV E6 proteins bind to and modify the target specificity of the ubiquitin ligase E6AP (E6 associated protein). This E6-dependent loss of p53 enables the virus to bypass host cell defenses and facilitates virally induced activation of the cell cycle progression during viral replication. Disruption of the interaction between E6 and E6AP and stabilization of p53 should decrease viability and proliferation of HPV positive cells. A new in vitro high-throughput binding assay was developed to assay binding between HPV-16 E6 and E6AP and to identify compounds that inhibit this interaction. The compound luteolin emerged from the screen and a library of novel flavones based on its structure was synthesized and characterized using this in vitro binding assay. The compounds identified in this study disrupt the E6/E6AP interaction, increase the levels of p53 and p21(Cip1/Waf1), and decrease proliferation of HPV positive cell lines. The new class of flavonoid E6 inhibitors displays a high degree of specificity for HPV positive cells. Docking analyses suggest that these compounds bind in a hydrophobic pocket at the interface between E6 and E6AP and mimic the leucines in the conserved α-helical motif of E6AP. The activity and specificity of these compounds represent a promising new lead for development as an antiviral therapy in the treatment of HPV infection and cervical cancer.

摘要

人乳头瘤病毒(HPV)早期蛋白6(E6)的表达及功能对于宫颈癌中的病毒复制和肿瘤发生是必需的。HPV E6靶向肿瘤抑制蛋白p53使其降解。为实现这一点,“高危”HPV E6蛋白结合并改变泛素连接酶E6AP(E6相关蛋白)的靶标特异性。这种E6依赖的p53缺失使病毒能够绕过宿主细胞防御,并在病毒复制过程中促进病毒诱导的细胞周期进程激活。破坏E6与E6AP之间的相互作用并使p53稳定,应会降低HPV阳性细胞的活力和增殖。开发了一种新的体外高通量结合试验,以检测HPV - 16 E6与E6AP之间的结合,并鉴定抑制这种相互作用的化合物。木犀草素从筛选中脱颖而出,基于其结构合成了一个新型黄酮类化合物库,并使用这种体外结合试验对其进行了表征。本研究中鉴定出的化合物破坏了E6/E6AP相互作用,增加了p53和p21(Cip1/Waf1)的水平,并降低了HPV阳性细胞系的增殖。新型黄酮类E6抑制剂对HPV阳性细胞表现出高度特异性。对接分析表明,这些化合物结合在E6与EAP界面处的疏水口袋中,并模拟E6AP保守α螺旋基序中的亮氨酸。这些化合物的活性和特异性代表了一种有前景的新先导物,可用于开发作为治疗HPV感染和宫颈癌的抗病毒疗法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f749/3871595/e49258af9f0b/pone.0084506.g001.jpg

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