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核糖體分流

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核糖體分流(Ribosome shunting)為真核生物細胞的核糖體轉譯一些病毒mRNA時,在掃描mRNA的過程中跳過5′非翻译区部分二級結構複雜的序列,直接與該序列下游的序列結合的機制[1],最早於1990年代在花椰菜嵌紋病毒(CaMV)的mRNA中發現[2]。許多病毒mRNA的核糖體分流需仰賴其5′非翻译区的上游开放阅读框(uORF),核糖體完成uORF的轉譯後(通常僅有2-15個密碼子),60S核糖体亚基自核糖體脫離,40S核糖体亚基則跳過(take-off)mRNA下游5-10nt處一段二級結構複雜的序列,與下游的降落位點(landing site)結合,再重新開始掃描,找到下一個開放閱讀框起始密碼子後再次與60S亚基結合而開始轉譯[2][3]

已知腺病毒[4]仙台病毒[5][6]人類乳突病毒(HPV)、人泡沫病毒英语Human foamy virus[2]鴨B型肝炎病毒[2]水稻东格鲁桿狀病毒英语Tungrovirus(RTBV)[7]與花椰菜嵌紋病毒[8]等多種病毒的mRNA轉譯都有核糖體分流的機制。

參考文獻

  1. ^ Edgil, D; Polacek, C; Harris, E. Dengue virus utilizes a novel strategy for translation initiation when cap-dependent translation is inhibited. Journal of Virology. 2006, 80 (6): 2976–86. PMC 1395423可免费查阅. PMID 16501107. doi:10.1128/JVI.80.6.2976-2986.2006. 
  2. ^ 2.0 2.1 2.2 2.3 Pooggin MM, Ryabova LA. Ribosome Shunting, Polycistronic Translation, and Evasion of Antiviral Defenses in Plant Pararetroviruses and Beyond.. Front Microbiol. 2018, 9: 644. PMC 5902531可免费查阅. PMID 29692761. doi:10.3389/fmicb.2018.00644. 
  3. ^ Roger Hull. Chapter 6 - Genome Composition, Organization, and Expression. Plant Virology (Fifth Edition). Academic Press. 2014 [2021-12-05]. doi:10.1016/B978-0-12-384871-0.00006-6. (原始内容存档于2021-12-05). 
  4. ^ Yueh, A; Schneider, RJ. Selective translation initiation by ribosome jumping in adenovirus-infected and heat-shocked cells. Genes & Development. 1996, 10 (12): 1557–67. PMID 8666238. doi:10.1101/gad.10.12.1557可免费查阅. 
  5. ^ De Breyne, S; Simonet, V; Pelet, T; Curran, J. Identification of a cis-acting element required for shunt-mediated translational initiation of the Sendai virus Y proteins. Nucleic Acids Research. 2003, 31 (2): 608–18. PMC 140508可免费查阅. PMID 12527769. doi:10.1093/nar/gkg143. 
  6. ^ Latorre, P; Kolakofsky, D; Curran, J. Sendai virus Y proteins are initiated by a ribosomal shunt. Molecular and Cellular Biology. 1998, 18 (9): 5021–31. PMC 109087可免费查阅. PMID 9710586. doi:10.1128/mcb.18.9.5021. 
  7. ^ Pooggin, M. M.; Ryabova, LA; He, X; Fütterer, J; Hohn, T. Mechanism of ribosome shunting in Rice tungro bacilliform pararetrovirus. RNA. 2006, 12 (5): 841–50. PMC 1440904可免费查阅. PMID 16556934. doi:10.1261/rna.2285806. 
  8. ^ Pooggin, MM; Hohn, T; Fütterer, J. Role of a short open reading frame in ribosome shunt on the cauliflower mosaic virus RNA leader. The Journal of Biological Chemistry. 2000, 275 (23): 17288–96. PMID 10747993. doi:10.1074/jbc.M001143200可免费查阅.