Sorting of Two Polytopic Proteins, the γ-Aminobutyric Acid and Betaine Transporters, in Polarized Epithelial Cells*

Sorting of Two Polytopic Proteins, the γ-Aminobutyric Acid and Betaine Transporters, in Polarized Epithelial Cells*
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极化上皮细胞中两种多位蛋白(γ-氨基丁酸和甜菜碱转运蛋白)的分选*

DOI:
10.1074/jbc.272.10.6584
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发表时间:
1997
期刊:
The Journal of Biological Chemistry
影响因子:
--
通讯作者:
G. Pietrini
G. Pietrini
中科院分区:
--
文献类型:
--
作者:
C. Perego;A. Bulbarelli;R. Longhi;M. Caimi;A. Villa;M. Caplan;G. Pietrini

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当引入 Madin-Darby 犬肾细胞时,γ-氨基丁酸的 γ-氨基丁酸转运蛋白 (GAT-1) 亚型和甜菜碱 (BGT) 转运蛋白表现出不同的顶端和基底外侧分布(Pietrini, G.、Suh, Y. J.、Edelman, L.、Rudnick, G. 和 Caplan, M. J. (1994) J. Biol.化学 269, 4668-4674)。我们通过突变和嵌合转运蛋白在 Madin-Darby 犬肾细胞中的表达,研究了其 COOH 末端胞质结构域中分选信号的存在。虽然截短的 GAT-1 (ΔC-GAT) 保持了原始的功能活性和顶端定位,但 BGT 胞质尾部的去除 (ΔC-myc BGT) 或替换 (BGS 嵌合体) 产生了在内质网中积累的蛋白质。此外,我们发现 BGT 的胞质尾部将顶端蛋白、多位 GAT-1(GBS 嵌合体)和单位人神经生长因子受体重定向到基底外侧表面。这些结果表明 BGT 胞质尾部存在基底外侧分选信息。我们进一步表明,BGT 从内质网退出和 GBS 嵌合体基底外侧定位所需的信息包含在 BGT 胞质尾部内富含碱性残基的短片段中。
The γ-aminobutyric acid transporter (GAT-1) isoform of the γ-aminobutyric acid and the betaine (BGT) transporters exhibit distinct apical and basolateral distributions when introduced into Madin-Darby canine kidney cells (Pietrini, G., Suh, Y. J., Edelman, L., Rudnick, G., and Caplan, M. J. (1994) J. Biol. Chem. 269, 4668-4674). We have investigated the presence of sorting signals in their COOH-terminal cytosolic domains by expression in Madin-Darby canine kidney cells of mutated and chimeric transporters. Whereas truncated GAT-1 (ΔC-GAT) maintained the original functional activity and apical localization, either the removal (ΔC-myc BGT) or the substitution (BGS chimera) of the cytosolic tail of BGT generated proteins that accumulated in the endoplasmic reticulum. Moreover, we have found that the cytosolic tail of BGT redirected apical proteins, the polytopic GAT-1 (GBS chimera) and the monotopic human nerve growth factor receptor, to the basolateral surface. These results suggest the presence of basolateral sorting information in the cytosolic tail of BGT. We have further shown that information necessary for the exit of BGT from the endoplasmic reticulum and for the basolateral localization of the GBS chimera is contained in a short segment, rich in basic residues, within the cytosolic tail of BGT.
肠刷状缘膜钠/葡萄糖协同转运蛋白作为同源四聚体在原位发挥作用。
DOI: 10.1073/pnas.87.4.1456
发表时间: 1990
影响因子: 11.1
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DOI: 10.1126/science.1975955
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轴突 γ-氨基丁酸转运蛋白 GAT-1 被分选至极化上皮细胞的顶膜。
DOI: --
发表时间: 1994
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Roth,MG
DOI: 10.1002/j.1460-2075.1990.tb07513.x
发表时间: 1990-10-01
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
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通讯作者: PETERSON, PA