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Cell:王艳丽组/章新政组在CRISPR-Cas系统切割RNA的研究中获得重大进展附专家点评:

2017-07-28 BioArt BioArt

7月27日,中科院生物物理所王艳丽课题组与章新政课题合作在Cell杂志发表了题为“The Molecular Architecture for RNA-Guided RNA Cleavage by Cas13a”的研究论文,该研究成功解析了Leptotrichia buccalis (Lbu)细菌中Cas13a与crRNA (CRISPR-RNA)及其target RNA三元复合物3.08?的晶体

王艳丽的研究组在2016年就开始利用结构生物学的方法研究cas13a的结构和机理,并在2017年先后发表了两篇Cell 文章来阐明不同来源的cas13a结构。在一月份的文章中,王艳丽组通过解析沙氏纤毛菌cas13a和crRNA复合物的结构,发现cas13a蛋白可以分为两个单元,每一个都有RNA内切酶结构域。她们发现cas13a中第一个单元中的Helical-1结构域含有RNA内切酶的活性位点,可以切pre-crRNA而得到成熟的crRNA,而第二个单元可以切靶点RNA。在7月的最新文章中,她们得到了口腔纤毛菌(Leptotrichia buccalis)的cas13a-crRNA-靶点RNA的三元复合体的结构,从而进一步阐明了cas13a的作用机理。她们发现cas13a的第二个单元中的RNA内切酶结构域(HEPN)在没有结合RNA时是没有活性的,而在crRNA 和靶点RNA配对后,可以激活cas13a中的这个HEPN的RNA酶活性,从而对单链RNA进行快速非特异性的切除。这种由RNA配对而活化的内切酶机理是一个新发现,对CRISPR系统的新应用有很大指导作用。更有趣的是,与Jenifer Doudna组的假说相符,这种cas13a在活化后对RNA的切除不限于靶点RNA,而是非特异地切除附近任何单链RNA。

基于此发现的一个有趣的猜想是:这种CRISPR-cas13a系统对RNA的非特异降解将可以造成感染RNA病毒的宿主细菌死亡,从而阻止病毒继续感染其他细胞。这个系统在概念上类似于真核细胞的凋亡,通过牺牲细胞个体来保证整个机体的存活。然而对于单细胞的纤毛菌来说,这种牺牲个体来保存种群的方式却出乎意料并让人费解。可见细菌的世界还有很多意想不到的事情等着人们去发现。

原始出处
[1]Abudayyeh, O. O., Gootenberg, J. S., Konermann, S.,et al. (2016). C2c2 is a single-component programmable RNA-guided RNA-targeting CRISPR effector. Science, 353(6299), aaf5573.
[2]East-Seletsky, A., O’Connell, M. R., Knight, S. C.,et al.(2016). Two distinct RNase activities of CRISPR-C2c2 enable guide-RNA processing and RNA detection. Nature, 538(7624), 270-273.
[3]Liu, L., Li, X., Wang, J.,et al. (2017). Two distant catalytic sites are responsible for C2c2 RNase activities. Cell, 168(1), 121-134.
[4]Liang Liu, Xueyan Li, Jun Ma, et al.The Molecular Architecture for RNA-Guided RNA Cleavage by Cas13a.Cell.DOI: http://dx.doi.org/10.1016/j.cell.2017.06.050

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    2017-11-19 维他命
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    2017-07-29 yuandd
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    2017-07-29 yaanren
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    2017-07-28 Y—xianghai

    学习了新知识

    0

  8. [GetPortalCommentsPageByObjectIdResponse(id=1870078, encodeId=a1e718e00781b, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Wed Aug 02 15:28:00 CST 2017, time=2017-08-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960337, encodeId=83cf196033e6b, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=52, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Sun Nov 19 22:28:00 CST 2017, time=2017-11-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1814518, encodeId=afb3181451818, content=<a href='/topic/show?id=f72795e80d0' target=_blank style='color:#2F92EE;'>#重大进展#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=66, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=95780, encryptionId=f72795e80d0, topicName=重大进展)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4c37265, createdName=医者仁心, createdTime=Thu Aug 10 06:28:00 CST 2017, time=2017-08-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1276036, encodeId=f1db12e6036bd, content=<a href='/topic/show?id=755d5211a0' target=_blank style='color:#2F92EE;'>#CRISPR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5211, encryptionId=755d5211a0, topicName=CRISPR)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=583c133, createdName=yuandd, createdTime=Sat Jul 29 23:28:00 CST 2017, time=2017-07-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1455278, encodeId=0f1014552e83c, content=<a href='/topic/show?id=ce8452137f' target=_blank style='color:#2F92EE;'>#CRISPR-Cas#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=65, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5213, encryptionId=ce8452137f, topicName=CRISPR-Cas)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=e8505649833, createdName=guihongzh, createdTime=Sat Jul 29 23:28:00 CST 2017, time=2017-07-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1624835, encodeId=4c0316248353b, content=<a href='/topic/show?id=0333412062' target=_blank style='color:#2F92EE;'>#Cas#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4120, encryptionId=0333412062, topicName=Cas)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=411420689333, createdName=yaanren, createdTime=Sat Jul 29 23:28:00 CST 2017, time=2017-07-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=227296, encodeId=91ba22e2967c, content=学习了新知识, beContent=null, objectType=article, channel=null, level=null, likeNumber=73, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20201006/4db877c2887649beb09cb5effd0b38c7/916f66edd48a4e77b20ebc3e14b6e45c.jpg, createdBy=141e1980133, createdName=Y—xianghai, createdTime=Fri Jul 28 17:53:28 CST 2017, time=2017-07-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=227142, encodeId=d90222e14299, content=学习,谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=94, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/aLGWoFXAyMbIu3qymFOyhb9xDeHojCicsdRdyC3XXdGk2ib9yLypZuHN06WeW4HO8WN0GGrgEfvnTX8gsckof05GHOU5OM4Mvx/0, createdBy=9cee1982656, createdName=执着追梦, createdTime=Fri Jul 28 08:45:54 CST 2017, time=2017-07-28, status=1, ipAttribution=)]
    2017-07-28 执着追梦

    学习,谢谢分享

    0

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