Lipid sorting by ceramide structure from plasma membrane to ER for the cholera toxin receptor ganglioside GM1.

Lipid sorting by ceramide structure from plasma membrane to ER for the cholera toxin receptor ganglioside GM1.
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DOI:
10.1016/j.devcel.2012.08.002
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发表时间:
2012-09-11
期刊:
影响因子:
11.8
通讯作者:
Lencer, Wayne I.
Lencer, Wayne I.
中科院分区:
生物学1区
文献类型:
--
作者:
Chinnapen, Daniel J-F.;Hsieh, Wan-Ting;te Welscher, Yvonne M.;Saslowsky, David E.;Kaoutzani, Lydia;Brandsma, Eelke;D'Auria, Ludovic;Park, Hyejung;Wagner, Jessica S.;Drake, Kimberly R.;Kang, Minchul;Benjamin, Thomas;Ullman, M. David;Costello, Catherine E.;Kenworthy, Anne K.;Baumgart, Tobias;Massol, Ramiro H.;Lencer, Wayne I.

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鞘糖脂GM1结合宿主细胞上的霍乱毒素(CT),并将其从质膜(PM)逆行携带通过内体、反式高尔基体(TGN)和内质网(ER)以诱导毒性。为了阐明膜脂质如何在这些途径中指定贩运,我们合成了具有交替神经酰胺结构域的GM1亚型,并在活细胞中对其贩运进行成像。只有具有不饱和酰基链的GM1有效地从PM分选到TGN和ER。毒素结合,有效地交联GM1脂质,是不必要的,但膜胆固醇和脂筏相关蛋白肌动蛋白和flotillin是必需的。这些结果暗示了神经酰胺结构的脂质分选的蛋白质依赖性机制,并为宿主细胞中CT逆行运输的多样性和特异性提供了分子解释。
The glycosphingolipid GM1 binds cholera toxin (CT) on host cells and carries it retrograde from the plasma membrane (PM) through endosomes, the trans-Golgi (TGN), and the endoplasmic reticulum (ER) to induce toxicity. To elucidate how a membrane lipid can specify trafficking in these pathways, we synthesized GM1 isoforms with alternate ceramide domains and imaged their trafficking in live cells. Only GM1 with unsaturated acyl chains sorted efficiently from PM to TGN and ER. Toxin binding, which effectively crosslinks GM1 lipids, was dispensable, but membrane cholesterol and the lipid raft-associated proteins actin and flotillin were required. The results implicate a protein-dependent mechanism of lipid-sorting by ceramide structure and provide a molecular explanation for the diversity and specificity of retrograde trafficking by CT in host cells.
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