Identification of regulators of chaperone-mediated autophagy.

Identification of regulators of chaperone-mediated autophagy.
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DOI:
10.1016/j.molcel.2010.08.004
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发表时间:
2010-08-27
期刊:
影响因子:
16
通讯作者:
Cuervo AM
Cuervo AM
中科院分区:
生物学1区
文献类型:
--
作者:
Bandyopadhyay U;Sridhar S;Kaushik S;Kiffin R;Cuervo AM

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伴侣介导的自噬(CMA)是溶酶体中胞质蛋白降解的一种选择性机制,有助于细胞质量控制,并在营养缺乏时成为氨基酸的额外来源。伴侣复合物将CMA底物传递给溶酶体膜上的受体蛋白,该受体蛋白组装成多聚易位复合物。然而,调控这一过程的机制在很大程度上仍然是未知的。在这项工作中,我们已经确定了两个调节蛋白,GFAP和EF1α,介导GTP对CMA的先前未知的抑制作用。GFAP稳定多聚易位复合物,防止伴侣介导的拆卸,而gtp介导的溶酶体膜EF1α的释放促进GFAP的自我结合,CMA易位复合物的拆卸,从而减少CMA。这两种蛋白在溶酶体膜上的动态相互作用揭示了GTP作为CMA负调节因子的作用。
Chaperone-mediated autophagy (CMA) is a selective mechanism for the degradation of cytosolic proteins in lysosomes that contributes to cellular quality control and becomes an additional source of amino acids when nutrients are scarce. A chaperone complex delivers CMA substrates to a receptor protein at the lysosomal membrane that assembles into multimeric translocation complexes. However, the mechanisms regulating this process remain, for the most part, unknown. In this work, we have identified two regulatory proteins, GFAP and EF1α, that mediate a previously unknown inhibitory effect of GTP on CMA. GFAP stabilizes the multimeric translocation complex against chaperone-mediated disassembly, whereas GTP-mediated release of EF1α from the lysosomal membrane promotes self-association of GFAP, disassembly of the CMA translocation complex and the consequent decrease in CMA. The dynamic interactions of these two proteins at the lysosomal membrane unveil now a role for GTP as negative regulator of CMA.
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