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NATURE:mRNA竟可以成环,促进肿瘤发生

2018-09-22 海北 MedSci原创

METTL3-eIF3h相互作用是增强翻译,形成密集的多核糖体和致癌转化所必需的。METTL3消除抑制致瘤性并使肺癌细胞对BRD4抑制敏感。

N6-甲基腺苷(m6A)mRNA的修饰正在成为影响不同发育和生物过程的基因表达的重要调节因子。已有的研究显示,改变的m6A稳态与癌症相关。 m6A修饰由METTL3催化,并在靠近终止密码子的3'非翻译区位点富集。METTL3可以促进翻译,但这一过程的机制和相关性仍然未知。
最近,来自波士顿儿童医院的研究人员发现,METTL3仅在与终止密码子附近的位点连接到报告mRNA时能够增强翻译,与mRNA成环促进核糖体再循环和翻译控制的机制相符。
电子显微镜揭示了具有单个METTL3位点的单个多核糖体的拓扑结构,其紧邻5'帽结合蛋白。研究人员确定了METTL3与真核翻译起始因子3亚基h(eIF3h)之间的直接物理和功能相互作用。
METTL3促进大部分致癌mRNA的翻译,包括含溴结构域的蛋白,其在人原发性肺肿瘤中也是m6A修饰的。 METTL3-eIF3h相互作用是增强翻译,形成密集的多核糖体和致癌转化所必需的。METTL3消除抑制致瘤性并使肺癌细胞对BRD4抑制敏感。
这些发现揭示了基于mRNA循环的翻译控制机制,并将METTL3-eIF3h鉴定为癌症患者的潜在治疗靶点。

原始出处:
Choe J et al. mRNA circularization by METTL3-eIF3h enhances translation and promotes oncogenesis. NATURE 2018, DOI: 10.1038/s41586-018-0538-8. 

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    2019-08-11 liye789132251
  2. [GetPortalCommentsPageByObjectIdResponse(id=1883322, encodeId=976c188332227, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=65, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Sun Aug 11 05:59:00 CST 2019, time=2019-08-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=346774, encodeId=0372346e7403, content=谢谢分享,学习了,感谢, beContent=null, objectType=article, channel=null, level=null, likeNumber=99, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c8e425737, createdName=tw007007, createdTime=Wed Sep 26 16:24:49 CST 2018, time=2018-09-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=346143, encodeId=492c34614397, content=知之为知之, beContent=null, objectType=article, channel=null, level=null, likeNumber=87, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTKibA62IFMeUJEmSyIe8DvYFeERuOsfrRd8iano7nENqQU1dRR3tqeQOUL3eqgYgEZRT2t2iaEsib0JEw/132, createdBy=66771693911, createdName=易水河, createdTime=Sat Sep 22 09:18:11 CST 2018, time=2018-09-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=346135, encodeId=37cf3461354f, content=谢谢分享,学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=106, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo6Nx0VGA4QMDzOP8oAgnV4h51EjSfehJ9QxyiaSmw8PB56BhY8KXFSxHCibXrzcy4abrzSibXQPxJ9kzrLcJyhhB8a/0, createdBy=1d3b1672603, createdName=明月清辉, createdTime=Sat Sep 22 08:53:32 CST 2018, time=2018-09-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=346093, encodeId=001634609324, content=学习了,谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7c592194322, createdName=1209e435m98(暂无昵称), createdTime=Sat Sep 22 07:45:18 CST 2018, time=2018-09-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=346088, encodeId=cffd3460880e, content=学习了谢谢, beContent=null, objectType=article, channel=null, level=null, likeNumber=93, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTLbTp9nZtjwVrSZNxAXbAicnKQWnic2eBdJUQYhxO36XdkstSicr7FVF8p5ReH4omtmsbnLdvZLiaJJ1A/132, createdBy=8bff2327056, createdName=kafei, createdTime=Sat Sep 22 07:37:23 CST 2018, time=2018-09-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=346079, encodeId=4a983460e9d0, content=谢谢分享,学习了。, beContent=null, objectType=article, channel=null, level=null, likeNumber=54, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2018/07/16/3b24606172648eea459125cb74754afe.jpg, createdBy=6c022216608, createdName=liumin1987, createdTime=Sat Sep 22 07:11:36 CST 2018, time=2018-09-22, status=1, ipAttribution=)]
    2018-09-26 tw007007

    谢谢分享,学习了,感谢

    0

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    2018-09-22 易水河

    知之为知之

    0

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    2018-09-22 明月清辉

    谢谢分享,学习了

    0

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    2018-09-22 1209e435m98(暂无昵称)

    学习了,谢谢分享

    0

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    2018-09-22 kafei

    学习了谢谢

    0

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    2018-09-22 liumin1987

    谢谢分享,学习了。

    0

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