概括
酵母病毒 ScV 含有两种 dsRNA:L 和 M. 缺陷干扰颗粒 (S) 由 M 删除产生的,保存的 3' 端序列表明它在病毒RNA聚合酶识别中发挥作用.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 酵母遗传学 酵母遗传学
背景情况:
- 酵母病毒ScV通过交配传播,并具有两个不同的dsRNA分子.
- 一个dsRNA,L,编码主要囊蛋白,而另一个,M,编码影响酵母缺乏ScV-M颗粒的毒素.
研究的目的:
- 调查ScV.中缺陷干扰粒子 (S) 的起源和特征.
- 分析ScV dsRNAs的3'末端保存的序列及其潜在的功能.
主要方法:
- 分析独立分离的S dsRNAs以确定它们与M dsRNA的关系.
- 测序L,M和SdRNA的3'末端,以确定保存和可变区域.
主要成果:
- 五个独立分离的S dsRNA都被发现是通过内部删除从M dsRNA衍生出来的.
- 在所有ScVdRNAs的3'端观察到显著的异质性.
- 在M和S dsRNAs (AAACACCCAUCAOH和AUUCUUUAUUUUUCAOH) 和L dsRNAs (UAAAAAUUUCAOH和AAAAAUXCAOH) 的3'端发现了保存的序列.
结论:
- 这些发现表明,ScV的缺陷干扰颗粒 (S) 源于MdRNA内部的内部删除.
- 保存的3'端序列AUUUUUCAOH被提议作为囊相关单链RNA聚合酶的识别位点.
- 病毒RNA的3'末端可能延伸一个核酸超出ppGp的5'末端.
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