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CSP泛素化有利于伯氏疟原虫在早期肝脏阶段感染期间存活。

CSP ubiquitylation favours Plasmodium berghei survival during early liver stage infection.

作者信息

Baptista Sara J S, Lahree Aparajita, Marques Sofia, Bento Inês, Mello-Vieira João, Mendes António M, Zuzarte-Luís Vanessa, Mota Maria M

机构信息

Gulbenkian Institute for Molecular Medicine, 1649-028, Lisbon, Portugal.

Instituto de Medicina Molecular JLA, Universidade de Lisboa, 1649-028, Lisbon, Portugal.

出版信息

Sci Rep. 2025 Apr 25;15(1):14498. doi: 10.1038/s41598-025-98294-4.

Abstract

The circumsporozoite protein (CSP), an essential protein that covers the surface of the Plasmodium sporozoite, is a key player in multiple stages of the parasite development within the mosquito and during interactions between sporozoites and mammalian hepatocytes. Here, we identify a novel function of Plasmodium berghei CSP: preventing parasite elimination during the early stages of hepatic infection, through its ubiquitylation at two lysine (K) residues, K252 and K258, located in the C-terminal domain. A Plasmodium berghei transgenic line lacking these lysine residues exhibited a significant decrease in hepatic infectivity, with parasites being eliminated 4 h after infection. The reduced infectivity correlated with an increased association of host autophagy markers, LC3 and LAMP1, to the parasitophorous vacuole membrane of the liver stage parasite. Notably, inhibiting the host autophagy pathway fully rescued the mutant parasites from elimination. Collectively, we reveal a strategy employed by Plasmodium to evade early clearance during hepatic infection, which relies on the ubiquitylation of specific CSP lysine residues, that results in reduced parasite elimination via host autophagic and lysosomal activity.

摘要

环子孢子蛋白(CSP)是一种覆盖疟原虫子孢子表面的必需蛋白,在疟原虫在蚊子体内发育的多个阶段以及子孢子与哺乳动物肝细胞相互作用的过程中发挥关键作用。在此,我们鉴定出伯氏疟原虫CSP的一种新功能:通过其位于C末端结构域的两个赖氨酸(K)残基K252和K258的泛素化作用,在肝脏感染的早期阶段防止寄生虫被清除。缺乏这些赖氨酸残基的伯氏疟原虫转基因系肝脏感染性显著降低,感染后4小时寄生虫即被清除。感染性降低与宿主自噬标志物LC3和LAMP1与肝期寄生虫的寄生泡膜的结合增加相关。值得注意的是,抑制宿主自噬途径可完全挽救突变寄生虫免于被清除。我们共同揭示了疟原虫在肝脏感染期间用于逃避早期清除的一种策略,该策略依赖于特定CSP赖氨酸残基的泛素化作用,导致通过宿主自噬和溶酶体活性减少寄生虫清除。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0624/12032137/68ab549019aa/41598_2025_98294_Fig1_HTML.jpg

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