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Autophagy:中科院科学家阐述NAC复合体在细胞自噬中的功能

2014-11-18 佚名 生物谷

2014年10月, 中科院生物物理所张宏研究组在国际著名期刊Autophagy上发表题为“The nascent polypeptide-associated complex is essential for autophagic flux”的文章报告了其最新研究成果。研究人员采用RNAi的方法使相应基因在线虫发育特定阶段失活。利用这种手段,张宏等人进行全基因组RNAi筛选,通过分析线虫肠道细胞中

2014年10月, 中科院生物物理所张宏研究组在国际著名期刊Autophagy上发表题为“The nascent polypeptide-associated complex is essential for autophagic flux”的文章报告了其最新研究成果。

研究人员采用RNAi的方法使相应基因在线虫发育特定阶段失活。利用这种手段,张宏等人进行全基因组RNAi筛选,通过分析线虫肠道细胞中自噬底物SQST-1(线虫中的p62同源物)聚集体增加与否来判断与线虫发育相关的自噬相关基因。通过分析,张宏等人首次发现icd-2和icd-1等基因具有与目前学术界已知自噬基因相似的表型。


通过进一步分析这两种基因的功能,科学家发现icd-2和icd-1基因分别控制着编码新生多肽复合体NAC(nascent polypeptide-associated complex)的α和β亚单位的形成,而前期研究显示这种复合体在核糖体相关的多个蛋白质共翻译过程,包括将蛋白质转运至内质网和线粒体,并且NAC作为一个分子伴侣能帮助蛋白质正确折叠, 维持蛋白质的稳态和功能等功能中起着重要作用。

在这一研究中,研究人员首次证明NAC介导细胞自噬过程,并在降解一系列不同蛋白质的过程中扮演重要角色。NAC功能缺失严重影响自噬溶酶体的降解功能,导致自噬作用的蛋白底物在自噬溶酶体中大量聚集,导致细胞功能障碍。该研究证明NAC能够通过自噬机制维持细胞中蛋白质的稳态平衡。

原始出处:

Guo B1, Huang J2, Wu W3, Feng D3, Wang X4, Chen Y5, Zhang H1.The nascent polypeptide-associated complex is essential for autophagic flux.Autophagy. 2014 Oct 1;10(10):1738-48. doi: 10.4161/auto.29638. Epub 2014 Jul 18.

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    2015-01-26 gous
  2. [GetPortalCommentsPageByObjectIdResponse(id=1862508, encodeId=943c186250819, content=<a href='/topic/show?id=a121223385b' target=_blank style='color:#2F92EE;'>#中科院#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=22338, encryptionId=a121223385b, topicName=中科院)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7a9987, createdName=gous, createdTime=Mon Jan 26 23:36:00 CST 2015, time=2015-01-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1937720, encodeId=5db9193e720ed, content=<a href='/topic/show?id=ca28426010b' target=_blank style='color:#2F92EE;'>#复合体#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=67, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=42601, encryptionId=ca28426010b, topicName=复合体)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=395f25, createdName=bioon1, createdTime=Thu Nov 20 02:36:00 CST 2014, time=2014-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1299313, encodeId=26bf1299313d1, content=<a href='/topic/show?id=1dd5e8010f5' target=_blank style='color:#2F92EE;'>#细胞自噬#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78010, encryptionId=1dd5e8010f5, topicName=细胞自噬)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a7b6284, createdName=FukaiBao, createdTime=Thu Nov 20 04:36:00 CST 2014, time=2014-11-20, status=1, ipAttribution=)]
    2014-11-20 bioon1
  3. [GetPortalCommentsPageByObjectIdResponse(id=1862508, encodeId=943c186250819, content=<a href='/topic/show?id=a121223385b' target=_blank style='color:#2F92EE;'>#中科院#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=22338, encryptionId=a121223385b, topicName=中科院)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7a9987, createdName=gous, createdTime=Mon Jan 26 23:36:00 CST 2015, time=2015-01-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1937720, encodeId=5db9193e720ed, content=<a href='/topic/show?id=ca28426010b' target=_blank style='color:#2F92EE;'>#复合体#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=67, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=42601, encryptionId=ca28426010b, topicName=复合体)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=395f25, createdName=bioon1, createdTime=Thu Nov 20 02:36:00 CST 2014, time=2014-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1299313, encodeId=26bf1299313d1, content=<a href='/topic/show?id=1dd5e8010f5' target=_blank style='color:#2F92EE;'>#细胞自噬#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78010, encryptionId=1dd5e8010f5, topicName=细胞自噬)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a7b6284, createdName=FukaiBao, createdTime=Thu Nov 20 04:36:00 CST 2014, time=2014-11-20, status=1, ipAttribution=)]

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