Beclin 2 functions in autophagy, degradation of G protein-coupled receptors, and metabolism.

Beclin 2 functions in autophagy, degradation of G protein-coupled receptors, and metabolism.
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Beclin 2在自噬中功能,G蛋白偶联受体的降解和代谢。

DOI:
10.1016/j.cell.2013.07.035
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发表时间:
2013-08-29
期刊:
影响因子:
64.5
通讯作者:
Levine B
Levine B
中科院分区:
生物学1区
文献类型:
--
作者:
He C;Wei Y;Sun K;Li B;Dong X;Zou Z;Liu Y;Kinch LN;Khan S;Sinha S;Xavier RJ;Grishin NV;Xiao G;Eskelinen EL;Scherer PE;Whistler JL;Levine B

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自噬的分子机制及其与其他溶酶体降解途径的关系仍不完全清楚。在这里,我们确定了一种以前未表征的拟南芥特异性蛋白Beclin 2,它与Beclin 1一样,在自噬中起作用,并与III类PI 3 K复合物组分和Bcl-2相互作用。然而,Beclin 2,而不是Beclin 1,在另外的溶酶体降解途径中起作用。Beclin 2通过与GASP 1的相互作用,对几种G蛋白偶联受体(GPCR)的配体诱导的内溶酶体降解是必需的。Beclin 2纯合子敲除小鼠的胚胎存活率降低,杂合子敲除小鼠的自噬缺陷、脑大麻素1受体水平升高、食物摄入量增加、肥胖和胰岛素抵抗。我们的研究结果将Beclin 2确定为自噬和GPCR周转的新型融合调节剂,并强调了Beclin家族成员在自噬,内溶酶体运输和代谢中的功能和机制多样性。
The molecular mechanism of autophagy and its relationship to other lysosomal degradation pathways remain incompletely understood. Here, we identified a previously uncharacterized mammalian-specific protein, Beclin 2, which like Beclin 1, functions in autophagy and interacts with class III PI3K complex components and Bcl-2. However, Beclin 2, but not Beclin 1, functions in an additional lysosomal degradation pathway. Beclin 2 is required for ligand-induced endolysosomal degradation of several G protein-coupled receptors (GPCRs) through its interaction with GASP1. Beclin 2 homozygous knockout mice have decreased embryonic viability, and heterozygous knockout mice have defective autophagy, increased levels of brain cannabinoid 1 receptor, elevated food intake, and obesity and insulin resistance. Our findings identify Beclin 2 as a novel converging regulator of autophagy and GPCR turnover, and highlight the functional and mechanistic diversity of Beclin family members in autophagy, endolysosomal trafficking and metabolism.
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