ATP合成酶epsilon亚基:利什曼原虫中网格蛋白介导的血红蛋白内吞作用的非常规适配器。

IF 3.3 3区 生物学 Q3 CELL BIOLOGY
Journal of cell science Pub Date : 2025-07-15 Epub Date: 2025-07-24 DOI:10.1242/jcs.263555
Anjali Kapoor, Jitender Kumar Verma, Deepali Goyal, Shruti Agarwal, Aditi Gaur, Amitabha Mukhopadhyay
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引用次数: 0

摘要

在网格蛋白介导的胞吞作用中,受体的细胞质结构域与ap2接头结合,募集网格蛋白介导胞吞作用。经典的ap2适配器利什曼原虫尚未被鉴定。在这里,我们通过酵母双杂交筛选鉴定了ATP合成酶epsilon (LdATPS])亚基作为利什曼原虫的一个新的接头。随后,我们从利什曼原虫中克隆并表达了LdATPS,并发现LdATPS在利什曼原虫中与LdClathrin和血红蛋白受体共定位。我们发现LdATPS在LdHbR的细胞质结构域中直接与cargo-binding motif ‘YLAP’结合,而它通过clathrin-binding motif ‘LSELD’与LdClathrin末端结构域相互作用。因此,我们发现突变的网格蛋白结合盒LdATPS / L133A/L136A/D137A不与网格蛋白结合,不能定位在鞭毛袋中,其过表达完全阻断了利什曼原虫的血红蛋白内化。LdATPS[-/-]敲除寄生虫不能存活,表明其基本功能。然而,LdATPS α +/-寄生虫的血红蛋白内化被明显阻断,无法内化血红蛋白的LdATPS α +/-寄生虫无法在巨噬细胞中生长。我们的研究结果表明,LdATPS是利什曼原虫血红蛋白内吞过程中网格蛋白的一种新型接头。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
ATP synthase epsilon subunit is an unconventional adaptor in clathrin-mediated endocytosis of hemoglobin in Leishmania.

In clathrin-mediated endocytosis, the cytoplasmic domain of the receptor binds to the AP2 adaptor, which recruits clathrin to mediate endocytosis. The classical AP2 adaptor in Leishmania has not yet been characterized. Here, we identified ATP synthase epsilon (LdATPSε) subunit as a novel adaptor in Leishmania using yeast two-hybrid screening. Subsequently, we cloned and expressed LdATPSε from Leishmania and showed that LdATPSε colocalizes with LdClathrin and the hemoglobin receptor in Leishmania. We found that LdATPSε directly binds to a cargo-binding motif, 'YLAP', in the cytoplasmic domain of the high-affinity hemoglobin receptor, whereas it interacts with the LdClathrin terminal domain via a clathrin-binding motif, 'LSELD'. Consequently, we showed that mutated clathrin binding box LdATPSεL133A/L136A/D137A does not bind to clathrin and fails to localize in the flagellar pocket, and its overexpression completely blocks hemoglobin internalization in Leishmania. LdATPSε-/- parasites are not viable, indicating the essential function of LdATPSε. However, hemoglobin internalization in LdATPSε+/- parasites is significantly blocked, and LdATPSε+/- parasites fail to grow in macrophages as the parasites are unable to internalize hemoglobin. Our results demonstrate that LdATPSε is a novel adaptor for clathrin in hemoglobin endocytosis in Leishmania.

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来源期刊
Journal of cell science
Journal of cell science 生物-细胞生物学
CiteScore
7.30
自引率
2.50%
发文量
393
审稿时长
1.4 months
期刊介绍: Journal of Cell Science publishes cutting-edge science, encompassing all aspects of cell biology.
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