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Sorting Signals That Mediate Traffic of Chitin Synthase III between the TGN/Endosomes and to the Plasma Membrane in Yeast

机译:分选信号那TGN /内涵体之间和在质膜中酵母甲壳质合酶III的调解交通

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摘要

Traffic of the integral yeast membrane protein chitin synthase III (Chs3p) from the trans-Golgi network (TGN) to the cell surface and to and from the early endosomes (EE) requires active protein sorting decoded by a number of protein coats. Here we define overlapping signals on Chs3p responsible for sorting in both exocytic and intracellular pathways by the coats exomer and AP-1, respectively. Residues 19DEESLL24, near the N-terminal cytoplasmically-exposed domain, comprise both an exocytic di-acidic signal and an intracellular di-leucine signal. Additionally we show that the AP-3 complex is required for the intracellular retention of Chs3p. Finally, residues R374 and W391, comprise another signal responsible for an exomer-independent alternative pathway that conveys Chs3p to the cell surface. These results establish a role for active protein sorting at the trans-Golgi en route to the plasma membrane (PM) and suggest a possible mechanism to regulate protein trafficking.
机译:完整的酵母膜蛋白几丁质合酶III(Chs3p)从反式高尔基体网络(TGN)到细胞表面以及与早期内体(EE)之间的运输,需要对活性蛋白进行分类,并通过许多蛋白外壳进行解码。在这里,我们在Chs3p上定义了重叠信号,分别由外壳外显子和AP-1负责细胞外和细胞内途径的分类。 NDE胞质暴露域附近的残基19DEESLL24既包含胞外二酸信号,又包含胞内二亮氨酸信号。此外,我们表明,AP-3复合物是Chs3p在细胞内保留所必需的。最后,残基R374和W391包含另一个信号,该信号负责将Chs3p传递至细胞表面的不依赖外聚物的替代途径。这些结果为反式高尔基体到质膜(PM)途中的活性蛋白分选奠定了基础,并提出了调节蛋白运输的可能机制。

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