Two independent domains of hDlg are sufficient for subcellular targeting: the PDZ1-2 conformational unit and an alternatively spliced domain.

Two independent domains of hDlg are sufficient for subcellular targeting: the PDZ1-2 conformational unit and an alternatively spliced domain.
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HDLG的两个独立域足以用于亚细胞靶向:PDZ1-2构象单元和一个剪接的域。

DOI:
10.1083/jcb.135.4.1125
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发表时间:
1996-11
影响因子:
7.8
通讯作者:
Branton, D
Branton, D
中科院分区:
生物学1区
文献类型:
--
作者:
Lue, RA;Brandin, E;Chan, EP;Branton, D

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HDlg是果蝇Dig肿瘤抑制因子的人类同源物,含有两个结合蛋白4.1的结合位点,一个位于包含三个PSD-95/DLG/ZO-1(PDZ)重复序列的结构域中,另一个位于选择性剪接的I3结构域中。在这里,我们进一步定义了PDZ-蛋白4.1在体外的相互作用,并展示了两个4.1结合位点在原位的功能作用。完整的PDZ重复序列1和2(PDZ1-2)形成一个单一的蛋白酶抗性结构(PDZ1-2),含有蛋白4.1结合位点。这个PDZ1-2位点和I3结构域都与蛋白4.1的一个30-kD的NH2末端结构域有关,该结构域在Ezrin/Radisin/Moesin(ERM)蛋白中保守。我们发现蛋白4.1和Ezrin ERM蛋白都与小鼠形式的hDlg在共沉淀免疫复合体中相互作用。在通透性细胞和组织中,仅PDZ1-2结构域或I3结构域就足以正确地针对外源hDlg进行亚细胞靶向。在原位,PDZ1-2介导的靶向包括与4.1/ERM蛋白和含有COOH末端T/SXV基序的蛋白的相互作用。I3介导的靶向完全依赖于与4.1/ERM蛋白的相互作用。我们的数据阐明了膜相关鸟苷酸激酶同源蛋白(MAGUK)靶向的多价性质,从而开始定义那些在MAGUK功能中至关重要的蛋白质相互作用。
hDlg, a human homologue of the Drosophila Dig tumor suppressor, contains two binding sites for protein 4.1, one within a domain containing three PSD-95/Dlg/ZO-1 (PDZ) repeats and another within the alternatively spliced I3 domain. Here, we further define the PDZ- protein 4.1 interaction in vitro and show the functional role of both 4.1 binding sites in situ. A single protease-resistant structure formed by the entirety of both PDZ repeats 1 and 2 (PDZ1-2) contains the protein 4.1-binding site. Both this PDZ1-2 site and the I3 domain associate with a 30-kD NH2-terminal domain of protein 4.1 that is conserved in ezrin/radixin/moesin (ERM) proteins. We show that both protein 4.1 and the ezrin ERM protein interact with the murine form of hDlg in a coprecipitating immune complex. In permeabilized cells and tissues, either the PDZ1-2 domain or the I3 domain alone are sufficient for proper subcellular targeting of exogenous hDlg. In situ, PDZ1-2- mediated targeting involves interactions with both 4.1/ERM proteins and proteins containing the COOH-terminal T/SXV motif. I3-mediated targeting depends exclusively on interactions with 4.1/ERM proteins. Our data elucidates the multivalent nature of membrane-associated guanylate kinase homologue (MAGUK) targeting, thus beginning to define those protein interactions that are critical in MAGUK function.
DOI: 10.1083/jcb.121.3.491
发表时间: 1993-05
期刊: The Journal of cell biology
影响因子: --
作者:
Itoh M;Nagafuchi A;Yonemura S;Kitani-Yasuda T;Tsukita S;Tsukita S
通讯作者: Tsukita S
DOI: 10.1038/378085a0
发表时间: 1995-11-02
期刊: NATURE
影响因子: 64.8
作者:
KIM, E;NIETHAMMER, M;SHENG, M
通讯作者: SHENG, M
DOI: 10.1016/0092-8674(93)90296-3
发表时间: 1993-07-16
期刊: CELL
影响因子: 64.5
作者:
BARSAGI, D;ROTIN, D;SCHLESSINGER, J
通讯作者: SCHLESSINGER, J
DOI: 10.1016/0092-8674(87)90025-0
发表时间: 1987-08-14
期刊: CELL
影响因子: 64.5
作者:
BECKERS, CJM;KELLER, DS;BALCH, WE
通讯作者: BALCH, WE
DOI: 10.1016/0896-6273(92)90245-9
发表时间: 1992-11-01
期刊: NEURON
影响因子: 16.2
作者:
CHO, KO;HUNT, CA;KENNEDY, MB
通讯作者: KENNEDY, MB