Regulation of Beclin 1 in autophagy.

Regulation of Beclin 1 in autophagy.
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DOI:
10.4161/auto.5.5.8524
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发表时间:
2009-07
期刊:
影响因子:
13.3
通讯作者:
Zhong Q
Zhong Q
中科院分区:
生物学1区
文献类型:
--
作者:
Sun Q;Fan W;Zhong Q

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第三类磷脂酰肌醇3-激酶(PI3KC3)在自噬和蛋白质分选途径中起着多效性的作用。PI3KC3的人核心复合体由PI3KC3/hVps34、P150和Beclin 1三个主要组分组成,PI3KC3复合体的自噬特异性尚不清楚。利用顺序亲和纯化结合质谱学的方法,我们成功地纯化了人Beclin 1复合体,并克隆了一个新的蛋白,我们称之为Barkor(Beclin 1相关自噬相关关键调节蛋白)。Barkor在自噬中的作用已经在几种分析中得到了证实,包括应激诱导的LC3脂化、自噬小体的形成和鼠伤寒沙门氏菌的扩增。在机制上,Barkor与紫外线辐射抗性相关基因产物(UVRAG)竞争与Beclin 1的相互作用,并将Beclin 1定向到自噬小体。Barkor在酵母中与Atg14有相当大的序列同源性,代表着在自噬形成早期进化保守的自噬特异性调控步骤。
Class III phosphatidylinositol 3-kinase (PI3KC3) plays a pleiotropic role in autophagy and protein sorting pathways. The human core complex of PI3KC3 consists of three major components including PI3KC3/hVps34, p150 and Beclin 1. How the specificity of PI3KC3 complex is derived towards autophagy is not clear. Utilizing a sequential affinity purification coupled with mass spectrometry approach, we have successfully purified a human Beclin 1 complex and cloned a novel protein we called Barkor (Beclin 1-associated autophagy-related key regulator). The function of Barkor in autophagy has been manifested in several assays, including stress-induced LC3 lipidation, autophagosome formation and Salmonella typhimurium amplification. Mechanistically, Barkor competes with UV radiation resistance associated gene product (UVRAG) for interaction with Beclin 1, and orients Beclin 1 to autophagosomes. Barkor shares considerable sequence homology with Atg14 in yeast, representing an evolutionary conserved autophagy specific regulatory step in early autophagosome formation.
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发表时间: 2001-02-05
期刊: The Journal of cell biology
影响因子: --
作者:
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