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通过RNA转糖酶对DNA基质进行特定部位的共价标记

Ember M Tota¹, Neal K Devaraj¹

¹Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States.

Journal of the American Chemical Society

|March 29, 2023

概括

细菌tRNA关氨酸转糖酶 (TGTs) 现在可以修改DNA,而不仅仅是RNA. 这种新的DNA-TAG系统可以为各种生物研究应用提供特定地点的DNA标签.

科学领域:

生物化学
分子生物学
合成生物学

背景情况:

细菌tRNA关氨酸转糖酶 (TGTs) 通过将关氨酸与prequeuosine1 (preQ1) 交换自然修饰RNA.
该RNA-TAG系统使用TGTs来修改RNA与记者分子.
之前的研究表明,TGT不能改变原生DNA.

研究的目的:

调查并确定TGTs修改DNA基质的能力.
开发一种类似于RNA-TAG的DNA修饰系统.
确定TGT介导转糖酶的最小DNA序列要求.

主要方法:

对突变DNA针序列进行代测试,以确定最小的识别动机.
优化DNA发针结构以控制硬质约束并提高标签效率.
开发的DNA-TAG系统用于探针合成.

主要成果:

证明大肠杆菌TGT可以识别和特定地标记DNA针基质.
确定控制DNA发针中的硬质约束对于有效的标记至关重要.
在优化时实现了DNA基质的近量修饰.
通过DNA-TAG系统成功合成了光北方涂抹和RNA FISH的探针.

结论:

该DNA-TAG系统可使用TGT进行特定位点的DNA修饰.
这一突破将TGTs的实用性扩展到RNA修饰之外.
DNA-TAG系统提供了一种多功能且易于使用的工具,用于创建多种研究应用的修饰DNA基板.

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