Biotechnology and Biological Sciences Research Council (BBSRC)
BB/X01097X/1
英国
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/Y005732/1
英国
引用
ジャーナル: J Mol Biol / 年: 2025 タイトル: The Specificity of RNA Packaging in Isometric RNA Plant Viruses is Principally Determined by Replication. 著者: Keith Saunders / Sachin N Shah / Hadrien Peyret / Yulia Meshcheriakova / Jake Richardson / Sandra Eltschkner / David M Lawson / George P Lomonossoff / 要旨: A potato virus X (PVX)-based transient expression system (pEff) that produces replicating RNA has been used to examine the specificity of RNA packaging in the isometric viruses, turnip crinkle virus ...A potato virus X (PVX)-based transient expression system (pEff) that produces replicating RNA has been used to examine the specificity of RNA packaging in the isometric viruses, turnip crinkle virus (TCV) and satellite tobacco necrosis virus-1 (STNV-1). Expression of the coat proteins from the subgenomic RNA derived from the replicating PVX genome results in the efficient production of virus-like particles (VLPs), indistinguishable in structure from native virus particles, and encapsidation of both the subgenomic RNA and truncated versions of the replicating genomic RNA. Non-specific encapsidation of host RNA (which is not replicating) could not be detected in this system, implying that replication is the major determinant of packaging in isometric as well as filamentous positive-strand RNA plant viruses. We further utilised the system to investigate the role of putative packaging signals previously identified within the coat protein open reading frames of both TCV and STNV-1. The results show that eliminating the hairpin structures previously identified as packaging signals has no detectable effect on the specificity of RNA packaging. Replacement of the 213 nucleotide sequence within the TCV coat protein coding region, believed to be important for genomic packaging, with an equivalent sequence codon-optimised for Plasmodium falciparum resulted in less efficient capsid formation and RNA packaging, but did not alter packaging specificity; addition of copies of the wild-type sequence did not complement the defects. We propose that replication is the major determinant of genome packaging specificity in plant RNA viruses, while packaging signals may play a role in packaging efficiency.
履歴
登録
2025年4月11日
登録サイト: PDBE / 処理サイト: PDBE
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2025年4月23日
Provider: repository / タイプ: Initial release
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2025年4月23日
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名称: Turnip crinkle virus / タイプ: VIRUS 詳細: In the manuscript, this sample is designated TCV-P38+1. The complete P38 coat protein gene was inserted into the pEff vector together with an additional duplicated portion of P38 (hence +1). ...詳細: In the manuscript, this sample is designated TCV-P38+1. The complete P38 coat protein gene was inserted into the pEff vector together with an additional duplicated portion of P38 (hence +1). Expression was initiated by infiltrating leaves of Nicotiana benthamiana with suspensions of Agrobacterium tumefaciens strain LBA4404 harbouring this vector. Entity ID: all / 由来: RECOMBINANT
分子量
値: 6.86 MDa / 実験値: NO
由来(天然)
生物種: Turnip crinkle virus (ウイルス) / 株: M
由来(組換発現)
生物種: Nicotiana benthamiana (ナス科)
ウイルスについての詳細
中空か: NO / エンベロープを持つか: NO / 単離: STRAIN / タイプ: VIRUS-LIKE PARTICLE
天然宿主
生物種: Brassica rapa subsp. rapa
ウイルス殻
名称: capsid / 直径: 340 nm / 三角数 (T数): 3
緩衝液
pH: 7.4 / 詳細: 1 mM MgSO4 1mM NaPO4 and pH7.4
試料
濃度: 4 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES
試料支持
詳細: glow discharged for 60 seconds at 8 mA using an ACE 200 (Leica Microsystems) グリッドの材料: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R2/1
急速凍結
装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277 K