在体外通过cordycepin 5'-三酸盐对染色质相关的多A合成的特定抑制
K M Rose1, L E Bell, S T Jacob
1Department of Pharmacology, Milton S. Hershey Medical Centre, Pennsylvania State University, College of Medicine, Hershey, Pennsylvania 17033, USA.
Nature
|May 12, 1977
概括
科迪塞5'-三酸盐 (3'dATP) 在体外选择性地抑制了mRNA的初始多基化. 这种药物还抑制了RNA合成,与染色质结合的RNA聚合酶I比RNA聚合酶II更敏感.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 基因表达规范 基因表达规范
背景情况:
- 细胞mRNA在其3'-末端拥有多基酸) 环,这对mRNA稳定性和翻译至关重要.
- mRNA多基化发生在转录后,涉及最初快速添加腺酸残留物,其次是缓慢的链延伸.
- 科尔迪塞宾 (Cordicepin) (3 个阶段脱氧腺素) 已被用于抑制多基化,但其体内特异性仍有争议.
研究的目的:
- 为了在体外研究由cordycepin 5 étaire三酸盐 (3 étairedATP) 选择性抑制初始mRNA多基化.
- 为了确定染色体相关的多聚合酶是否被3 étairedATP.选择性抑制.
主要方法:
- 使用无细胞系统进行体外研究,以评估3个阶段ATP对多基和RNA合成的影响.
- 对于RNA聚合酶I和RNA聚合酶II到3的差异敏感性测定,ATP抑制得到了改善.
主要成果:
- 低水平的3 étairedATP在体外选择性地抑制了初始mRNA多化反应.
- 更高度的3 étairedATP抑制了mRNA和rRNA合成.
- 染色素结合的RNA聚合酶I比染色素结合的RNA聚合酶II对3个阶段的ATP抑制显著敏感.
结论:
- 这项研究支持这样一个假设:染色素相关的多聚酶参与了初始mRNA多基化,并且可以通过3个阶段的ATP选择性地抑制.
- 3 étairedATP对RNA聚合酶表现出差异性抑制作用,这对理解基因表达调节有意义.
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