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
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    2014-11-20 bioon1
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