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Structures of ribonucleoprotein particle modification enzymes

机译:核糖核蛋白颗粒修饰酶的结构

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Small nucleolar and Cajal body ribonucleoprotein particles (RNPs) are required for the maturation of ribosomes and spliceosomes. They consist of small nucleolar RNA or Cajal body RNA combined with partner proteins and represent the most complex RNA modification enzymes. Recent advances in structure and function studies have revealed detailed information regarding ribonucleoprotein assembly and substrate binding. These enzymes form intertwined RNA–protein assemblies that facilitate reversible binding of the large ribosomal RNA or small nuclear RNA. These revelations explain the specificity among the components in enzyme assembly and substrate modification. The multiple conformations of individual components and those of complete RNPs suggest a dynamic assembly process and justify the requirement of many assembly factors in vivo.
机译:核糖体和剪接体的成熟需要小的核仁和Cajal体核糖核蛋白颗粒(RNP)。它们由小分子核仁RNA或Cajal体RNA结合伴侣蛋白组成,代表最复杂的RNA修饰酶。结构和功能研究的最新进展揭示了有关核糖核蛋白组装和底物结合的详细信息。这些酶形成相互缠绕的RNA-蛋白质装配体,促进大核糖体RNA或小核RNA的可逆结合。这些启示解释了酶组装和底物修饰中各组分之间的特异性。单个组件的多种构象和完整RNP的构象提示了动态组装过程,并证明了体内许多组装因子的需求。

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