Chemoenzymatic synthesis and in situ application of S-adenosyl-L-methionine analogs.

Chemoenzymatic synthesis and in situ application of S-adenosyl-L-methionine analogs.
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DOI:
10.1039/c3ob41702f
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发表时间:
2013-11-21
影响因子:
3.2
通讯作者:
Clausen RP
Clausen RP
中科院分区:
化学3区
文献类型:
--
作者:
Thomsen M;Vogensen SB;Buchardt J;Burkart MD;Clausen RP

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S-腺苷-L-甲硫氨酸(SAM)类似物越来越多地应用于甲基转移酶(MT)催化的生物分子(包括蛋白质、核酸和小分子)的修饰。然而,SAM和类似物具有固有的不稳定性,并且它们的化学合成受到低产率和立体异构体分离和抑制困难的挑战。在这里,我们报告了一系列SAM类似物的化学酶合成使用野生型(WT)和点突变体的两个最近确定的卤化酶,萨尔和FDAS。分子建模研究用于指导突变体的合理设计,并证明了L-Met和其他类似物转化为SAM类似物的酶促转化。我们还将这种原位酶促合成应用于蛋白质精氨酸甲基转移酶1(PRMT 1)对小肽底物的修饰。这种技术提供了一种有吸引力的替代化学合成,并可以在原位应用,以克服稳定性和活性问题。
Analogs of S-adenosyl-L-methionine (SAM) are increasingly applied to the methyltransferase (MT) catalysed modification of biomolecules including proteins, nucleic acids, and small molecules. However, SAM and analogs suffer from an inherent instability, and their chemical synthesis is challenged by low yields and difficulties in stereoisomer isolation and inhibition. Here we report the chemoenzymatic synthesis of a series of SAM analogs using wild-type (wt) and point mutants of two recently identified halogenases, SalL and FDAS. Molecular modelling studies are used to guide the rational design of mutants, and the enzymatic conversion of L-Met and other analogs into SAM analogs is demonstrated. We also apply this in situ enzymatic synthesis to the modification of a small peptide substrate by protein arginine methyltransferase 1 (PRMT1). This technique offers an attractive alternative to chemical synthesis and can be applied in situ to overcome stability and activity issues.
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