Site-specific alkylation of complex biomolecules is critical for late-stage product diversification as well as post-synthetic labeling and manipulation of proteins and nucleic acids. Promiscuous methyltransferases in combination with analogs of S-adenosyl-L-methionine (AdoMet) can functionalize all major classes of biomolecules. We show that benzylic moieties are transferred by Ecm1 with higher catalytic
caging groups enables the study and control of processes and interactions of nucleic acids. Numerous positions on nucleobases have been targeted, but all involve formal substitution of a hydrogen atom with a photocaging group. Nature, however, also uses ring‐nitrogen methylation, such as m7G and m1A, to change the electronic structure and properties of RNA and control biomolecular interactions essential
用不稳定性笼蔽基团对核碱基进行选择性修饰使得研究和控制核酸的过程和相互作用成为可能。核碱基上的许多位置已成为目标,但所有位置都涉及用光笼基团正式取代氢原子。然而,大自然也利用环氮甲基化(例如 m 7 G 和 m 1 A)来改变 RNA 的电子结构和性质,并控制翻译和更新所必需的生物分子相互作用。我们报告说,如果芳基酮(例如二苯甲酮和 α-羟烷基酮)安装在鸟苷的 N7 位或腺苷的 N1 位,则它们是光不稳定的笼蔽基团。衍生自邻硝基苄基部分的常见光锁定基团不适合。开发了在核苷、二核苷酸和RNA中对N7G进行位点特异性修饰的化学和酶促方法,从而为研究m 7 G和m 1 A在时空控制下的分子相互作用打开了大门。
Engineered SAM Synthetases for Enzymatic Generation of AdoMet Analogs with Photocaging Groups and Reversible DNA Modification in Cascade Reactions
作者:Freideriki Michailidou、Nils Klöcker、Nicolas V. Cornelissen、Rohit K. Singh、Aileen Peters、Anna Ovcharenko、Daniel Kümmel、Andrea Rentmeister
DOI:10.1002/anie.202012623
日期:2021.1.4
function of these modifications would benefit from tools for their site‐specific inhibition and timed removal. S‐Adenosyl‐L‐methionine (AdoMet) analogs in combination with methyltransferases (MTases) have proven useful to map or block and release MTase target sites, however their enzymatic generation has been limited to aliphatic groups at the sulfur atom. We engineered a SAM synthetase from Cryptosporidium
Nucleoside-modified AdoMet analogues for differential methyltransferase targeting
作者:Nicolas V. Cornelissen、Freideriki Michailidou、Fabian Muttach、Kristina Rau、Andrea Rentmeister
DOI:10.1039/c9cc07807j
日期:——
Methyltransferases (MTases) modify a wide range of biomolecules using S-adenosyl-l-methionine (AdoMet) as the cosubstrate. Synthetic AdoMet analogues are powerful tools to site-specifically introduce a variety of functional groups and exhibit potential to be converted only by distinct MTases. Extending the size of the substituent at the sulfur/selenium atom provides selectivity among MTases but is
Post-synthetic benzylation of the mRNA 5′ cap <i>via</i> enzymatic cascade reactions
作者:N. V. Cornelissen、R. Mineikaitė、M. Erguven、N. Muthmann、A. Peters、A. Bartels、A. Rentmeister
DOI:10.1039/d3sc03822j
日期:——
exclusively modifies mRNAs at the terminal N7G, producing mRNAs with functional 5′ caps. It avoids the wrong orientation of the 5′ cap—a problem in common co-transcriptional capping. In the case of the 4-chlorobenzyl group, protein production was increased to 139% during in vitro translation and to 128–150% in four different cell lines. This 5′ cap modification did not activate cytosolic pathogen recognition