1887

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Volume 102, Issue 3

Fiber1, but not fiber2, is the essential fiber gene for fowl adenovirus 4 (FAdV-4) Free

Abstract

Fibre is the viral protein that mediates the attachment and infection of adenovirus to the host cell. Fowl adenovirus 4 (FAdV-4) possesses two different fibre trimers on each penton capsomere, and roles of the separate fibres remain elusive. Here, we attempted to investigate the function of FAdV-4 fibres by using reverse genetics approaches. Adenoviral plasmids carrying fiber1 or fiber2 mutant genes were constructed and used to transfect chicken LMH cells. Fiber1-mutated recombinant virus could not be rescued. Such defective phenotype was complemented when a fiber1-bearing helper plasmid was included for co-transfection. The infection of fiber-intact FAdV-4 (FAdV4-GFP) to LMH cells could be blocked with purified fiber1 knob protein in a dose-dependent manner, while purifed fiber2 knob had no such function. On the contrary, fiber2-mutated FAdV-4, FAdV4XF2-GFP, was successfully rescued. The results of one-step growth curves showed that proliferative capacity of FAdV4XF2-GFP was 10 times lower than that of the control FAdV4-GFP. FAdV4XF2-GFP also caused fewer deaths of infected chicken embryos than FAdV4-GFP did, which resulted from poorer virus replication . These data illustrated that fiber1 mediated virus adsorption and was essential for FAdV-4, while fiber2 was dispensable although it significantly contributed to the virulence.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): essential gene , fiber , fowl adenovirus , reverse genetics and virus adsorption
Funding
This study was supported by the:
  • Ministry of Science and Technology of the People's Republic of China (Award 2018ZX10305-410-003-002)
    • Principle Award Recipient: XiaohuiZou
  • Ministry of Science and Technology of the People′s Republic of China (Award 2018ZX10102001)
    • Principle Award Recipient: ZhuoZhuangLu
© 2021 The Authors
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/content/journal/jgv/10.1099/jgv.0.001559
2021-02-24
2024-10-06
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Fiber1, but not fiber2, is the essential fiber gene for fowl adenovirus 4 (FAdV-4)
J. Gen. Virol. 102, 001559 (2021); https://doi.org/10.1099/jgv.0.001559
/content/journal/jgv/10.1099/jgv.0.001559
/content/journal/jgv/10.1099/jgv.0.001559
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