2-5A-依赖RNAase的表达克隆:干扰素作用的独特调节的介质
A Zhou1, B A Hassel, R H Silverman
1Department of Cancer Biology, Cleveland Clinic Foundation, Ohio 44195.
Cell
|March 12, 1993
概括
研究人员克隆并分析了2-5A依赖RNAase,这是干扰素作用和RNA稳定性至关重要的酶. 他们在自然和重组形式中发现了相同的结合和活性,揭示了这个重要的酶的关键结构见解.
科学领域:
- 分子生物学分子生物学
- 酶学 是一种酶学.
- 哺乳动物细胞生物学
背景情况:
- 2-5A依赖RNAase是一种干扰素诱导的酶.
- 它是由5'-酸化,2',5'-结合的橄基酸盐 (2-5A) 激活的.
- 这种酶在干扰素作用和细胞RNA稳定性中起作用.
研究的目的:
- 执行表达克隆和分析小鼠和人类2-5A依赖RNAases.
- 描述这些酶的2-5A结合特性和RNAase活动.
- 为了研究干扰素诱导2-5A依赖RNAase表达的作用.
主要方法:
- 鼠类和人类2-5A依赖RNAases的表达克隆.
- 生物化学测试以评估2-5A结合和RNAase活性.
- 在干扰素和循环赫西米德治疗后测量mRNA水平.
- 序列对齐,删除分析和位点定向突变发生.
主要成果:
- 再组合和自然发生的2-5A依赖RNAase表现出相同的2-5A结合和RNAase活动.
- 干扰素治疗诱导了2-5A依赖的RNAase表达,由mRNA水平分析证实.
- 序列分析显示了与大肠杆菌RNAase E的相似性,并确定了对2-5A结合至关重要的重复酸盐结合环模式.
结论:
- 这项研究成功地克隆和表征了哺乳动物的2-5A依赖RNAases.
- 一个重复的酸盐结合环形象对酶与2-5A的相互作用至关重要.
- 这些发现提供了对干扰素作用和RNA稳定性控制的分子机制的见解.
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