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单个处理中心模型用于人类Dicer和细菌RNase III

Haidi Zhang¹, Fabrice A Kolb, Lukasz Jaskiewicz

¹Friedrich Miescher Institute for Biomedical Research, PO Box 2543, 4002 Basel, Switzerland.

|July 10, 2004

概括

人类Dicer和大肠杆菌RNase III酶利用单一的催化中心进行RNA处理,产生特定的2nt3'突起. 这表明Dicer通过其RNase III域的分子内二元化来发挥作用.

科学领域:

分子生物学分子生物学
生物化学生物化学
在RNA生物学,RNA生物学.

背景情况:

迪克是RNA干扰至关重要的核糖酶,它将双链RNAs (dsRNAs) 处理成小干扰RNAs (siRNAs).
迪塞尔具有与细菌RNase III同源的域,这种酶已知可以作为同质体起作用.
之前的模型提出了dSRNA相互作用和RNase III在两个复合催化中心的分裂.

研究的目的:

研究人类Dicer和大肠杆菌RNaseIII的催化机制.
确定处理中心的数量和RNA裂变产品的性质.
为Dicer的酶活性提出一个功能模型.

主要方法:

在催化过程中涉及的人类Dicer和大肠杆菌RNase III残留物的局部定向突变发生.
分析突变对RNA处理活动的影响.
实验数据与RNase III的结构信息的整合.

主要成果:

突变分析显示,Dicer和RNase III都只有一个活跃的处理中心.
这个单一的中心包含了两个不同的RNA分裂点.
这些酶产生具有特征的2 nt 3'突起的RNA产物.

结论:

迪克可能通过其两个RNase III域的分子内二元化而起作用.
PAZ和dsRBD域有助于这种分子内二分化过程.
这项研究阐明了Dicer在RNA处理中的催化机制和四级结构.

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