Interactions of cytosolic termini of the Jen1 monocarboxylate transporter are critical for trafficking, transport activity and endocytosis

Interactions of cytosolic termini of the Jen1 monocarboxylate transporter are critical for trafficking, transport activity and endocytosis
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Jen1 单羧酸转运蛋白胞质末端的相互作用对于运输、转运活性和内吞作用至关重要

DOI:
10.1101/2021.09.27.461913
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发表时间:
2021
期刊:
--
影响因子:
--
通讯作者:
Barata-Antunes C
Barata-Antunes C
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--
文献类型:
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作者:
Barata-Antunes C

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在原核生物和真核生物中,主要促进子超家族 (MFS) 的质膜 (PM) 转运蛋白对于细胞代谢和生长以及响应应激或细胞毒性药物的生存至关重要。在酿酒酵母中,Jen1 是一种单羧酸盐/H+ 同向转运蛋白,已用于剖析 MFS 转运蛋白的细胞表达、转运机制和周转控制的分子细节。在这里,我们通过对合理设计的截断和与 UapA、aS 的嵌合结构进行功能分析,提出证据支持之前未描述过的胞质 N 端和 C 端在 Jen1 生物发生、PM 稳定性和活性中的作用。来自构巢曲霉的酿酒酵母胞吞作用不敏感的嘌呤转运蛋白。我们的结果揭示了 N 末端区域的神秘作用,从而表明胞质 N 末端和 C 末端对于 Jen1 运输到 PM、运输活性和内吞作用至关重要。特别是,我们提供的证据表明 Jen1 的 N 和 C 胞质末端经历运输依赖性动态分子内相互作用,这对 Jen1 的运输和周转机制产生严重影响。我们的结果支持了一个新兴概念,即 PM 转运蛋白的胞质尾部通过彼此之间以及蛋白质的跨膜核心之间灵活的分子内相互作用来控制转运蛋白的表达和功能。这个想法可以扩展到其他 MFS 成员,提供对 MFS 转运蛋白结构-功能关系的保守但不断发展的机制的更深入的理解。
Plasma membrane (PM) transporters of the major facilitator superfamily (MFS) are essential for cell metabolism and growth, as well as for survival in response to stress or cytotoxic drugs, in both prokaryotes and eukaryotes. In the yeastSaccharomyces cerevisiae, Jen1 is a monocarboxylate/H+symporter that has been used to dissect the molecular details underlying control of cellular expression, transport mechanism and turnover of MFS transporters. Here, we present evidence supporting previously non-described roles of the cytosolic N- and C- termini in Jen1 biogenesis, PM stability and activity, through functional analyses of rationally designed truncations and chimeric constructs with UapA, aS. cerevisiaeendocytosis-insensitive purine transporter fromAspergillus nidulans. Our results reveal a cryptic role of the N-terminal region and thus show that both cytosolic N- and C-termini are critical for Jen1 trafficking to the PM, transport activity and endocytosis. In particular, we provide evidence that the N- and the C-cytosolic termini of Jen1 undergo transport-dependent dynamic intra-molecular interactions, which critically affect the mechanism of transport and turnover of Jen1. Our results support an emerging concept where the cytosolic tails of PM transporters control transporter expression and function, through flexible intra-molecular interactions with each other and the transmembrane core of the protein. This idea may be extended to other MFS members providing a deeper understanding of conserved, but also evolving, mechanisms underlying MFS transporter structure-function relationships.
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