Insertion of the Polytopic Membrane Protein MalF Is Dependent on the Bacterial Secretion Machinery (*)

Insertion of the Polytopic Membrane Protein MalF Is Dependent on the Bacterial Secretion Machinery (*)
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多位膜蛋白 MalF 的插入取决于细菌分泌机制 (*)

DOI:
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发表时间:
1996
影响因子:
4.8
通讯作者:
Christopher Murphy
Christopher Murphy
中科院分区:
生物学2区
文献类型:
--
作者:
B. Traxler;Christopher Murphy

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我们研究了依赖于蛋白质出口和膜蛋白插入SecE和SecA,两个组成部分的分泌(Sec)的大肠杆菌装置。分泌缺陷的幅度观察到的信号序列的蛋白质在细胞中耗尽SecE是更大的和更普遍的比,在许多温度或冷敏感的Sec突变体。此外,我们还表明,多位MalF蛋白(在没有信号序列的情况下合成)正确插入细胞质膜也是SecE依赖性的。与早期的研究(McGovern,K.,Beckwith,J.(1991)J.Biol.Chem.266,20870-20876),MalF的膜插入也通过用叠氮化钠(SecA的有效抑制剂)处理细胞来抑制。因此,我们的数据有力地表明,MalF的细胞质膜插入依赖于相同的细胞机器,因为它参与了含有信号序列的蛋白质的出口。我们建议,从细胞质的出口机制是相关的信号序列和细胞质膜蛋白,但疏水膜蛋白,如MalF可能有更高的亲和力的SEC装置。
We examined the dependence of protein export and membrane protein insertion on SecE and SecA, two components of the secretion (Sec) apparatus of Escherichia coli. The magnitude of the secretion defect observed for signal sequence-containing proteins in cells depleted of SecE is larger and more general than that in many temperature- or cold-sensitive Sec mutants. In addition, we show that the proper insertion of the polytopic MalF protein (synthesized without a signal sequence) into the cytoplasmic membrane is also SecE-dependent. In contrast to an earlier study (McGovern, K., and Beckwith, J.(1991) J. Biol. Chem. 266, 20870-20876), the membrane insertion of MalF also is inhibited by treatment of cells with sodium azide, a potent inhibitor of SecA. Therefore, our data strongly suggest that the cytoplasmic membrane insertion of MalF is dependent on the same cellular machinery as is involved in the export of signal sequence-containing proteins. We propose that the mechanism of export from the cytoplasm is related for both signal sequence-containing and cytoplasmic membrane proteins, but hydrophobic membrane proteins such as MalF may have a higher affinity for the Sec apparatus.
DOI: 10.1073/pnas.87.21.8227
发表时间: 1990-11-01
影响因子: 11.1
作者:
OLIVER, DB;CABELLI, RJ;JAROSIK, GP
通讯作者: JAROSIK, GP
大肠杆菌甘露醇渗透酶的膜插入发生在 SecA 功能受损的条件下。
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
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三个跨膜延伸之一足以发挥 SecE 蛋白(大肠杆菌分泌机制的膜成分)的功能。
DOI: 10.1002/j.1460-2075.1991.tb07699.x
发表时间: 1991
期刊: The EMBO journal
影响因子: --
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DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
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通讯作者: Beckwith,J
膜蛋白拓扑的两亲序列决定因素。
DOI: --
发表时间: 1994
期刊: The Journal of biological chemistry
影响因子: --
作者:
Seligman,L;Manoil,C
通讯作者: Manoil,C