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酵母端粒酶RNA的逆折叠设计增加了体外活性

Kevin J Lebo¹, David C Zappulla^1,2

¹Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA.

|September 22, 2023

概括

研究人员使用逆RNA设计来设计Saccharomyces cerevisiae端粒酶RNA (TLC1) 以改善体外活性. 虽然这增强了催化功能,但它在体内减少了RNA的丰度,影响了端粒长度.

科学领域:

分子生物学分子生物学
在RNA生物学,RNA生物学.
生物化学生物化学

背景情况:

TLC1是一种大型非编码RNA,对Saccharomyces cerevisiae端粒酶功能至关重要,作为DNA合成模板和支架.
全长TLC1在体外表现出有限的活性,阻碍了研究,与较小的截断版本不同.
这表明全长的TLC1在体外可能会错误折叠,从而损害其催化效率.

研究的目的:

通过反向RNA设计方法,设计一个全长的酵母端粒酶RNA (TLC1),改善了体外折叠和活性.
评估逆设计的TLC1等位基对telomerase功能在体外和体内生物化学和生物学影响.

主要方法:

利用基于Mfold软件预测的逆RNA折叠策略来改变TLC1序列以提高结构稳定性.
通过改变59个核酸以有利于本地结构折叠,创建了一个修改后的TLC1等位基因,DA-TLC1.
在体外和体内对tlc1∆菌株的补充中评估了复制的端粒酶活性.

主要成果:

反向设计的DA-TLC1等位基因在体外表现出与野生型TLC1.1相比,大约5倍的端粒酶活性.
在体内,DA-TLC1补充了tlc1∆菌株,保持端粒长度并防止衰老.
反向设计的TLC1变种在体内显示细胞丰度减少,在广泛的Ku臂修改后显著减少.

结论:

反向RNA设计可以增强酵母端末酶RNA的体外折叠和催化活性.
在改善体外功能的同时,反向设计策略可能会对体内RNA稳定性和丰度产生负面影响.
本研究提出了一种有效的反向设计方法来控制RNA结构,适用于基础研究和生物医学.

关键词:

这里是Est2 Est2.在Mfold中,Mfold是Mfold,而Mfold是Mfold.这是一个RNARNARNARNARNA.RNA的二级结构是RNA的二级结构.这就是为什么 TERTTT.在TLC1上.设计的反向设计.没有编码的RNA.衰老是一种老化.端粒酶的使用方法端粒是什么意思端粒是什么意思

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