Dengue and Zika Virus Capsid Proteins Contain a Common PEX19-Binding Motif.

Dengue and Zika Virus Capsid Proteins Contain a Common PEX19-Binding Motif.
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DOI:
10.3390/v14020253
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发表时间:
2022-01-27
期刊:
Viruses
影响因子:
--
通讯作者:
Mayerhofer PU
Mayerhofer PU
中科院分区:
其他
文献类型:
--
作者:
Farelo MA;Korrou-Karava D;Brooks KF;Russell TA;Maringer K;Mayerhofer PU

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黄病毒,如登革热病毒(DENV)和寨卡病毒(ZIKV),已经进化出复杂的机制来抑制宿主免疫系统。例如,黄病毒感染被发现破坏了在先天免疫中具有重要作用的细胞器--过氧化物体。目前的模型表明,DENV和ZIKV的衣壳(C)蛋白下调过氧化物体,最终通过与宿主蛋白PEX19相互作用而导致干扰素的产生减少,PEX19是过氧化物体生物发生中的关键伴侣蛋白。在这里,我们旨在探索过氧化体的重要性以及C与PEX19相互作用在黄病毒生命周期中的作用。通过感染缺乏过氧酶体的细胞,我们证明了这种细胞器是DENV最佳复制所必需的。此外,我们证明DENV和ZIKV C通过保守的PEX19结合基序与PEX19结合,这也普遍存在于细胞过氧体膜蛋白(PMPs)中。然而,与PMPs不同的是,这种相互作用不会导致C靶向过氧化物酶体。此外,我们还表明,C的存在会导致过氧化物体生物发生受损,从而导致过氧化物体丢失,这似乎是通过PEX19不依赖的机制发生的。因此,这些发现挑战了目前的模型,即黄病毒C如何下调过氧化物体的丰度,并表明过氧化物体在黄病毒生物学中的作用尚不清楚。
Flaviviruses such as dengue virus (DENV) and Zika virus (ZIKV) have evolved sophisticated mechanisms to suppress the host immune system. For instance, flavivirus infections were found to sabotage peroxisomes, organelles with an important role in innate immunity. The current model suggests that the capsid (C) proteins of DENV and ZIKV downregulate peroxisomes, ultimately resulting in reduced production of interferons by interacting with the host protein PEX19, a crucial chaperone in peroxisomal biogenesis. Here, we aimed to explore the importance of peroxisomes and the role of C interaction with PEX19 in the flavivirus life cycle. By infecting cells lacking peroxisomes we show that this organelle is required for optimal DENV replication. Moreover, we demonstrate that DENV and ZIKV C bind PEX19 through a conserved PEX19-binding motif, which is also commonly found in cellular peroxisomal membrane proteins (PMPs). However, in contrast to PMPs, this interaction does not result in the targeting of C to peroxisomes. Furthermore, we show that the presence of C results in peroxisome loss due to impaired peroxisomal biogenesis, which appears to occur by a PEX19-independent mechanism. Hence, these findings challenge the current model of how flavivirus C might downregulate peroxisomal abundance and suggest a yet unknown role of peroxisomes in flavivirus biology.
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