Targeting of an abundant cytosolic form of the protein import receptor at Toc159 to the outer chloroplast membrane.

Targeting of an abundant cytosolic form of the protein import receptor at Toc159 to the outer chloroplast membrane.
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DOI:
10.1083/jcb.200104022
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发表时间:
2001-07-23
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Kessler F
Kessler F
中科院分区:
其他
文献类型:
--
作者:
Hiltbrunner A;Bauer J;Vidi PA;Infanger S;Weibel P;Hohwy M;Kessler F

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叶绿体的生物发生需要大规模输入细胞质合成的前体蛋白。一个三聚体的translocon(TOC复合物)含有两个同源的GTP结合蛋白(atToc33和atToc159)和通道蛋白(atToc75)促进蛋白质易位穿过外膜。Toc复合物的功能和组装机制尚不清楚。这项研究表明,atToc159及其豌豆直向同源物存在于丰富的,以前未被识别的可溶性形式,和分区之间的胞质可溶性组分和叶绿体外膜。我们发现,可溶性atToc159直接结合到atToc33的胞质结构域中的同型相互作用,有助于atToc159到叶绿体外膜的整合。这些数据表明,TOC复合物的功能涉及atToc159之间的可溶性和完整的膜形式的开关。
Chloroplast biogenesis requires the large-scale import of cytosolically synthesized precursor proteins. A trimeric translocon (Toc complex) containing two homologous GTP-binding proteins (atToc33 and atToc159) and a channel protein (atToc75) facilitates protein translocation across the outer envelope membrane. The mechanisms governing function and assembly of the Toc complex are not yet understood. This study demonstrates that atToc159 and its pea orthologue exist in an abundant, previously unrecognized soluble form, and partition between cytosol-containing soluble fractions and the chloroplast outer membrane. We show that soluble atToc159 binds directly to the cytosolic domain of atToc33 in a homotypic interaction, contributing to the integration of atToc159 into the chloroplast outer membrane. The data suggest that the function of the Toc complex involves switching of atToc159 between a soluble and an integral membrane form.
DOI: 10.1016/s0014-5793(98)01525-7
发表时间: 1998-12-11
期刊: FEBS LETTERS
影响因子: 3.5
作者:
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通讯作者: Soll, J
DOI: 10.1073/pnas.080491597
发表时间: 2000-04-25
影响因子: 11.1
作者:
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发表时间: 1994-11-11
期刊: SCIENCE
影响因子: 56.9
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DOI: 10.1126/science.7973656
发表时间: 1994-11-11
期刊: SCIENCE
影响因子: 56.9
作者:
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发表时间: 1999-06-25
影响因子: 4.8
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