Molecular organization of the COG vesicle tethering complex.

Molecular organization of the COG vesicle tethering complex.
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COG囊泡束缚复合物的分子组织。

DOI:
10.1038/nsmb.1917
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发表时间:
2010-11
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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多亚基拴系复合物的CATALYST(与拴系含螺旋杆)家庭提出介导的细胞内运输囊泡和它的膜靶之间的初始接触。为了开始阐明一个研究得很好的例子的分子结构,COG(保守寡聚高尔基体)复合体,我们重组了它的基本亚基(Cog 1,Cog 2,Cog 3和Cog 4),并使用单粒子电子显微镜揭示了一个Y形结构,具有三个灵活的,高度延伸的腿。标记实验证实,所有四个亚基的N-末端沿着一条腿的近端段相互作用,而四个C-末端中的三个位于腿的尖端。我们的研究结果表明,Cog 1 -4复合物的中心区域,以及至少两条腿的远端区域,都参与与细胞内运输机械的其他组件的相互作用。
Multisubunit tethering complexes of the CATCHR (Complexes Associated with Tethering Containing Helical Rods) family are proposed to mediate the initial contact between an intracellular trafficking vesicle and its membrane target. To begin elucidating the molecular architecture of one well-studied example, the COG (conserved oligomeric Golgi) complex, we reconstituted its essential subunits (Cog1, Cog2, Cog3, and Cog4) and used single-particle electron microscopy to reveal a y-shaped structure with three flexible, highly extended legs. Labeling experiments established that the N-termini of all four subunits interact along the proximal segment of one leg, whereas three of the four C-termini are located at the tips of the legs. Our results suggest that the central region of the Cog1-4 complex, as well as the distal regions of at least two legs, all participate in interactions with other components of the intracellular trafficking machinery.
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