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
DNA,RNA和蛋白质的甲基化和去甲基化已成为一种主要的调控机制。研究这些修饰的功能将受益于其位点特异性抑制和定时清除的工具。已证明S-腺苷-L-蛋氨酸(AdoMet)类似物与甲基转移酶(MTase)结合可用于定位或阻断和释放MTase目标位点,但是它们的酶促生成仅限于硫原子上的脂族基团。我们设计了来自人隐孢子虫的SAM合成酶(PC-ChMAT)可有效生成带有光笼基团的AdoMet类似物,迄今为止尚未报道过任何WT MAT所接受。PC-ChMAT在1.87Å处的晶体结构揭示了如何容纳光笼罩的AdoMet类似物并指导詹纳氏甲烷球菌的热稳定MAT工程化。PC-MAT与DNA和RNA MTase兼容,可对质粒DNA进行序列特异性修饰(“写”)并轻触发去除(“擦除”)。