Disruption of disulfide bonds exhibits differential effects on trafficking of regulated secretory proteins.

Disruption of disulfide bonds exhibits differential effects on trafficking of regulated secretory proteins.
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二硫键的破坏对受调节的分泌蛋白的运输表现出不同的影响。

DOI:
10.1152/ajpcell.1999.277.1.c121
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发表时间:
1999
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Arvan,P
Arvan,P
中科院分区:
--
文献类型:
--
作者:
Gorr,SU;Huang,XF;Cowley,DJ;Kuliawat,R;Arvan,P

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对于一些分泌蛋白,有假设认为二硫键环结构是分选分泌颗粒所必需的。为了探索这一假设,我们在活胰岛以及PC-12和gh4c1细胞中使用了二硫苏糖醇(DTT)治疗。在胰岛中,远端分泌途径中二硫的减少并没有增加胰岛素原(或胰岛素)的组成或组成样分泌。在PC-12细胞中,DTT处理导致新合成的嗜铬粒蛋白B (CgB)的非刺激分泌急剧增加,可能是由于单个保守的嗜铬粒蛋白二硫键减少的结果(E. Chanat, U. Weiss, W. B. Huttner和S. a . Tooze)。[j] .环境科学学报,1993(12):2159-2168。然而,在同样内源性合成CgB的gh4c1细胞中,DTT处理减少了新合成的催乳素并阻断了其输出,而新合成的CgB则被正常输送到分泌颗粒中。此外,在gh4c1细胞的瞬时表达中,CgA和缺乏保守二硫键的CgA突变体表现出相似的多聚体聚集特性,并通过刺激分泌试验靶向分泌颗粒。因此,由二硫破坏引起的调节分泌蛋白的构象扰动导致蛋白质运输的后果,这些后果都是蛋白质和细胞类型依赖的。
For several secretory proteins, it has been hypothesized that disulfide-bonded loop structures are required for sorting to secretory granules. To explore this hypothesis, we employed dithiothreitol (DTT) treatment in live pancreatic islets, as well as in PC-12 and GH4C1cells. In islets, disulfide reduction in the distal secretory pathway did not increase constitutive or constitutive-like secretion of proinsulin (or insulin). In PC-12 cells, DTT treatment caused a dramatic increase in unstimulated secretion of newly synthesized chromogranin B (CgB), presumably as a consequence of reducing the single conserved chromogranin disulfide bond (E. Chanat, U. Weiss, W. B. Huttner, and S. A. Tooze.EMBO J.12: 2159–2168, 1993). However, in GH4C1cells that also synthesize CgB endogenously, DTT treatment reduced newly synthesized prolactin and blocked its export, whereas newly synthesized CgB was routed normally to secretory granules. Moreover, on transient expression in GH4C1cells, CgA and a CgA mutant lacking the conserved disulfide bond showed comparable multimeric aggregation properties and targeting to secretory granules, as measured by stimulated secretion assays. Thus the conformational perturbation of regulated secretory proteins caused by disulfide disruption leads to consequences in protein trafficking that are both protein and cell type dependent.
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