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.
名称: Turnip crinkle virus / タイプ: virus / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: In the manuscript, this sample is designated TCV-M. The complete P38 coat protein gene was inserted into the pBin61 vector. Expression was initiated by infiltrating leaves of Nicotiana ...詳細: In the manuscript, this sample is designated TCV-M. The complete P38 coat protein gene was inserted into the pBin61 vector. Expression was initiated by infiltrating leaves of Nicotiana benthamiana with suspensions of Agrobacterium tumefaciens strain LBA4404 harbouring this vector. NCBI-ID: 11988 / 生物種: Turnip crinkle virus / Sci species strain: M / ウイルスタイプ: VIRION / ウイルス・単離状態: STRAIN / ウイルス・エンベロープ: No / ウイルス・中空状態: No