Dissecting the early and late endosomal pathways of Singapore grouper iridovirus by single-particle tracking in living cells

虹彩病毒 内体 生物 细胞生物学 衣壳 微管 自噬 病毒 细胞内 病毒学 遗传学 细胞凋亡
作者
Liqun Wang,Qiang Li,Xiaozhi Wen,Xinyue Zhang,Sheng Wang,Qiwei Qin
出处
期刊:International Journal of Biological Macromolecules [Elsevier]
卷期号:256: 128336-128336 被引量:1
标识
DOI:10.1016/j.ijbiomac.2023.128336
摘要

Iridoviruses are large DNA viruses that infect a wide range of invertebrates and lower vertebrates, causing serious threats to ecological security and aquaculture industry worldwide. However, the mechanisms underlying intracellular transport of iridovirus remain unknown. In this study, the transport of Singapore grouper iridovirus (SGIV) in early endosomes (EEs) and late endosomes (LEs) was explored by single-particle tracking technology. SGIV employs EEs to move rapidly from the cell membrane to the nucleus, and this long-range transport is divided into “slow-fast-slow” stages. SGIV within LEs mainly underwent oscillatory movements near the nucleus. Furthermore, SGIV entered newly formed EEs and LEs, respectively, possibly based on the interaction between the viral major capsid protein and Rab5/Rab7. Importantly, interruption of EEs and LEs by the dominant negative mutants of Rab5 and Rab7 significantly inhibited the movement of SGIV, suggesting the important roles of Rab5 and Rab7 in virus transport. In addition, it seems that SGIV needs to enter clathrin-coated vesicles to move from actin to microtubules before EEs carry the virus moving along microtubules. Together, our results for the first time provide a model whereby iridovirus transport depending on EEs and LEs, helping to clarify the mechanism underlying iridovirus infection, and provide a convenient tactic to investigate the dynamic infection of large DNA virus.
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