Peripheral protein quality control removes unfolded CFTR from the plasma membrane.

Peripheral protein quality control removes unfolded CFTR from the plasma membrane.
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DOI:
10.1126/science.1191542
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发表时间:
2010-08-13
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Lukacs GL
Lukacs GL
中科院分区:
其他
文献类型:
--
作者:
Okiyoneda T;Barrière H;Bagdány M;Rabeh WM;Du K;Höhfeld J;Young JC;Lukacs GL

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恢复缺乏F508残基的囊性纤维化跨膜传导调节因子(ΔF508CFTR)的生物合成加工的治疗努力受到来自质膜的非天然的、拯救的ΔF508CFTR的泛素依赖性溶酶体降解的阻碍。在这里,功能性小干扰RNA筛选揭示了分子伴侣,辅分子伴侣,和泛素结合和连接酶的贡献,从细胞表面消除未折叠的CFTR,作为外周蛋白质质量控制系统的一部分。非天然CFTR的泛素化是有效内化和溶酶体降解所必需的。这种外周蛋白质质量控制机制可能参与细胞内稳态的保存,通过降解受损的质膜蛋白质,这些蛋白质已从内质网质量控制中逃脱或由原位环境应力产生。
Therapeutic efforts to restore biosynthetic processing of the cystic fibrosis transmembrane conductance regulator lacking the F508 residue (ΔF508CFTR) are hampered by ubiquitin-dependent lysosomal degradation of nonnative, rescued ΔF508CFTR from the plasma membrane. Here, functional small interfering RNA screens revealed the contribution of chaperones, cochaperones, and ubiquitin-conjugating and -ligating enzymes to the elimination of unfolded CFTR from the cell surface, as part of a peripheral protein quality-control system. Ubiquitination of nonnative CFTR was required for efficient internalization and lysosomal degradation. This peripheral protein quality-control mechanism probably participates in the preservation of cellular homeostasis by degrading damaged plasma membrane proteins that have escaped from the endoplasmic reticulum quality control or are generated by environmental stresses in situ.
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发表时间: 2009-03-23
期刊: The Journal of cell biology
影响因子: --
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