Structural and functional characterization of CalS11, a TDP-rhamnose 3'-O-methyltransferase involved in calicheamicin biosynthesis.

Structural and functional characterization of CalS11, a TDP-rhamnose 3'-O-methyltransferase involved in calicheamicin biosynthesis.
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DOI:
10.1021/cb400068k
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发表时间:
2013-07-19
影响因子:
4
通讯作者:
Thorson JS
Thorson JS
中科院分区:
生物学2区
文献类型:
--
作者:
Singh S;Chang A;Helmich KE;Bingman CA;Wrobel RL;Beebe ET;Makino S;Aceti DJ;Dyer K;Hura GL;Sunkara M;Morris AJ;Phillips GN Jr;Thorson JS

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糖甲基转移酶(MT)是一类重要的剪裁酶,其催化甲基从S-腺苷-L-甲硫氨酸转移到糖基N-、C-和O-亲核试剂。虽然已经发现参与天然产物生物合成的糖N-和C-MT在随后的糖基转移酶反应之前作用于糖核苷酸底物,但迄今为止研究的相应糖O-甲基化反应发生在糖基转移反应之后。本文首次报道了利用1H-13 C-gHSQC和同位素标记底物对棘孢小单孢菌TDP-3′-O-鼠李糖甲基转移酶CalS 11进行体外表征,并在1.55 nm分辨率下进行了X射线结构测定。这项研究突出了一个独特的NMR为基础的甲基转移酶测定,暗示CalS 11是一种金属和一般的酸/碱依赖性O-甲基转移酶,并作为第一个晶体结构的TDP-己糖-O-甲基转移酶,提出了一个新的模板的机制研究和/或工程。
Sugar methyltransferases (MTs) are an important class of tailoring enzymes which catalyze the transfer of a methyl group from S-adenosyl-L-methionine to sugar-based N-, C- and O- nucleophiles. While sugar N- and C-MTs involved in natural product biosynthesis have been found to act on sugar nucleotide substrates prior to a subsequent glycosyltransferase reaction, corresponding sugar O-methylation reactions studied thus far occur after the glycosyltransfer reaction. Herein we report the first in vitro characterization using 1H-13C-gHSQC with isotopically-labeled substrates and the X-ray structure determination at 1.55 Å resolution of the TDP-3′-O-rhamnose-methyltransferase CalS11 from Micromonospora echinospora. This study highlights a unique NMR-based methyltransferase assay, implicates CalS11 to be a metal and general acid/base-dependent O-methyltransferase and, as a first crystal structure for a TDP-hexose-O-methyltransferase, presents a new template for mechanistic studies and/or engineering.
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