40S核糖体亚基
真核小核糖體亞基(英文:Eukaryotic small ribosomal subunit)又稱40S核糖体亚基(40S ribosomal subunit),是80S核糖體的較小亞基,該核糖體的另一成分是60S核糖體亞基。“40S”和“60S”的名稱源於核糖體顆粒根據其沉降係數以Svedberg單位表示。它在結構和功能上與70S原核核糖體的30S核糖體亞基有關。[1][2][3][4][5]但是,40S亞基比原核30S亞基大得多,並且包含許多其他蛋白質片段以及rRNA擴展片段。
功能
40S亞基包含一個解碼中心,該中心監控tRNA和mRNA在蛋白質轉譯中的互補性。它是包括43S和48S前起始複合體(PIC)的幾種轉譯起始複合體的最大組成部分,與多種真核起始因子如eIF1、eIF1A和eIF3結合。[6]
參見
- 60S核糖體亞基
參考資料
- 醫學主題詞表(MeSH):40S+Ribosomal+Subunits
- Rabl, J; Leibundgut, M; Ataide, SF; Haag, A; Ban, N. . Science. Feb 2011, 331 (6018): 730–736. PMID 21205638. doi:10.1126/science.1198308. hdl:20.500.11850/153130 .
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外部連結
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