Cargo-selective SNX-BAR proteins mediate retromer trimer independent retrograde transport.

Cargo-selective SNX-BAR proteins mediate retromer trimer independent retrograde transport.
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DOI:
10.1083/jcb.201702137
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发表时间:
2017-11-06
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Steinberg F
Steinberg F
中科院分区:
其他
文献类型:
--
作者:
Kvainickas A;Jimenez-Orgaz A;Nägele H;Hu Z;Dengjel J;Steinberg F

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Kvainickas等人表明,逆转录物货物CI-MPR不会通过与核心逆转录物三聚体的相互作用从内体再循环到反式高尔基体网络。相反,CI-MPR依赖于货物选择性SNX-BAR蛋白,其功能独立于核心逆转录三聚体。将阳离子非依赖性甘露糖6-磷酸受体(CI-MPR)从内体包裹到反式高尔基体网络(TGN)的逆转录聚合物复合物被认为由货物选择性VPS 26-VPS 29-VPS 35三聚体和分选连接蛋白(SNX)-Bin、Amphyphysin和Rvs(BAR; SNX-BAR)蛋白的膜变形亚基组成。在这项研究中,我们证明了SNX-BAR蛋白的异源二聚体,SNX 1,SNX 2,SNX 5和SNX 6,是介导CI-MPR从内体到TGN的逆行转运的货物选择性元件,独立于核心逆转录三聚体。使用定量蛋白质组学,我们还确定了IGF 1 R,在更多的潜在货物,作为另一个SNX 5和SNX 6结合受体,通过SNX-BAR异源二聚体,但不通过逆转录三聚体,在配体和激活依赖性的方式。总的来说,我们的数据重新定义了基于逆转录酶的分选机制,并质疑逆转录酶是否确实作为SNX-BAR蛋白和VPS 26-VPS 29-VPS 35三聚体的复合物起作用。
Kvainickas et al. show that the retromer cargo CI-MPR does not recycle from endosomes to the trans-Golgi network through interactions with the core retromer trimer. Instead, CI-MPR depends on cargo-selective SNX-BAR proteins, which function independently of the core retromer trimer. The retromer complex, which recycles the cation-independent mannose 6-phosphate receptor (CI-MPR) from endosomes to the trans-Golgi network (TGN), is thought to consist of a cargo-selective VPS26–VPS29–VPS35 trimer and a membrane-deforming subunit of sorting nexin (SNX)–Bin, Amphyphysin, and Rvs (BAR; SNX-BAR) proteins. In this study, we demonstrate that heterodimers of the SNX-BAR proteins, SNX1, SNX2, SNX5, and SNX6, are the cargo-selective elements that mediate the retrograde transport of CI-MPR from endosomes to the TGN independently of the core retromer trimer. Using quantitative proteomics, we also identify the IGF1R, among more potential cargo, as another SNX5 and SNX6 binding receptor that recycles through SNX-BAR heterodimers, but not via the retromer trimer, in a ligand- and activation-dependent manner. Overall, our data redefine the mechanics of retromer-based sorting and call into question whether retromer indeed functions as a complex of SNX-BAR proteins and the VPS26–VPS29–VPS35 trimer.
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