Liu Sunbin, Li Ping, Dybkov Olexandr, Nottrott Stephanie, Hartmuth Klaus, Lührmann Reinhard, Carlomagno Teresa, Wahl Markus C
Abteilung Zelluläre Biochemie, Max-Planck-Institut für Biophysikalische Chemie, Am Fassberg 11, D-37077 Göttingen, Germany.
Science. 2007 Apr 6;316(5821):115-20. doi: 10.1126/science.1137924.
Although highly homologous, the spliceosomal hPrp31 and the nucleolar Nop56 and Nop58 (Nop56/58) proteins recognize different ribonucleoprotein (RNP) particles. hPrp31 interacts with complexes containing the 15.5K protein and U4 or U4atac small nuclear RNA (snRNA), whereas Nop56/58 associate with 15.5K-box C/D small nucleolar RNA complexes. We present structural and biochemical analyses of hPrp31-15.5K-U4 snRNA complexes that show how the conserved Nop domain in hPrp31 maintains high RNP binding selectivity despite relaxed RNA sequence requirements. The Nop domain is a genuine RNP binding module, exhibiting RNA and protein binding surfaces. Yeast two-hybrid analyses suggest a link between retinitis pigmentosa and an aberrant hPrp31-hPrp6 interaction that blocks U4/U6-U5 tri-snRNP formation.
尽管剪接体中的人源 Prp31 蛋白与核仁中的 Nop56 和 Nop58(Nop56/58)蛋白高度同源,但它们识别不同的核糖核蛋白(RNP)颗粒。hPrp31 与含有 15.5K 蛋白和 U4 或 U4atac 小核 RNA(snRNA)的复合物相互作用,而 Nop56/58 则与 15.5K-box C/D 小核仁 RNA 复合物相关联。我们展示了 hPrp31-15.5K-U4 snRNA 复合物的结构和生化分析,这些分析表明,尽管对 RNA 序列要求较为宽松,但 hPrp31 中保守的 Nop 结构域如何维持高 RNP 结合选择性。Nop 结构域是一个真正的 RNP 结合模块,具有 RNA 和蛋白质结合表面。酵母双杂交分析表明,视网膜色素变性与人源 Prp31 和 hPrp6 之间异常的相互作用有关,这种相互作用会阻止 U4/U6-U5 三小核核糖核蛋白的形成。