A Clathrin-binding Site in the Hinge of the 2 Chain of Mammalian AP-2 Complexes (*)

A Clathrin-binding Site in the Hinge of the 2 Chain of Mammalian AP-2 Complexes (*)
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哺乳动物 AP-2 复合物 2 链铰链中的网格蛋白结合位点 (*)

DOI:
--
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发表时间:
1995
影响因子:
4.8
通讯作者:
T. Kirchhausen
T. Kirchhausen
中科院分区:
生物学2区
文献类型:
--
作者:
W. Shih;A. Gallusser;T. Kirchhausen

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组装的胞质网格蛋白到细胞质面的包被坑和包被囊泡似乎是由网格蛋白相关蛋白(AP)复合物。我们之前已经证明,AP复合物的大链之一,β链,足以在体外驱动涂层组装。该链由两个结构域组成,氨基末端主干和羧基末端耳,通过“铰链”连接。我们在此报道,重组β主干或重组β耳片段中铰链的存在对于驱动网格蛋白体外组装成被毛是必需的。我们还使用了结合试验来映射网格蛋白结合位点的嵌套删除铰链序列的铰链中心的50个残基的区域。该序列在来自多细胞生物的所有已知β序列中是保守的。单个β铰链与网格蛋白三聚体离子的相互作用较弱,我们提出,胞质网格蛋白向形成的包被凹坑的募集涉及单个网格蛋白三聚体的腿与两个或三个膜结合AP复合物的β铰链之间的同时接触。剥离涂层可能需要中断这些接触。
The assembly of cytosolic clathrin into the cytoplasmic face of coated pits and coated vesicles appears to be driven by the clathrin-associated protein (AP) complexes. We have previously shown that one of the large chains of the AP complexes, the β chain, is sufficient to drive coat assembly in vitro. This chain consists of two domains, the amino-terminal trunk and the carboxyl-terminal ear, linked by a “hinge.” We report here that presence of the hinge in recombinant β trunk or in recombinant β ear fragments is essential for driving in vitro assembly of clathrin into coats. We have also used a binding assay to map the clathrin-binding site by nested deletion of hinge sequences to a 50-residue region in the center of the hinge. This sequence is conserved in all known β sequences from multicellular organisms. The interaction of a single β hinge with a clathrin triskelion is weak, and we propose that recruitment of cytosolic clathrin to a forming coated pit involves simultaneous contacts between the legs of single clathrin trimers and the β hinges of two or three membrane-bound AP complexes. Uncoating is likely to require interruption of these contacts.
DOI: 10.1016/s0021-9258(18)61070-1
发表时间: 1987-07
期刊: The Journal of biological chemistry
影响因子: --
作者:
P. Matsudaira
通讯作者: P. Matsudaira
网格蛋白三体上网格蛋白相关蛋白 AP-2 和 AP-3 的识别位点。
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
Murphy,JE;Keen,JH
通讯作者: Keen,JH
网格蛋白结构域参与组装蛋白 AP-2 的识别。
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
作者:
Keen,JH;Beck,KA;Kirchhausen,T;Jarrett,T
通讯作者: Jarrett,T
激活的 EGF 受体与包被的凹坑适应素的相互作用。
DOI: 10.1126/science.8342026
发表时间: 1993
期刊: Science (New York, N.Y.)
影响因子: --
作者:
Sorkin,A;Carpenter,G
通讯作者: Carpenter,G
组装蛋白 AP-2 及其分离亚基与网格蛋白的相互作用。
DOI: 10.1021/bi00236a036
发表时间: 1991
期刊: Biochemistry
影响因子: 2.9
作者:
Prasad,K;Keen,JH
通讯作者: Keen,JH