Enzyme-catalyzed transfer of a ketone group from an S-adenosylmethionine analogue: a tool for the functional analysis of methyltransferases.

Enzyme-catalyzed transfer of a ketone group from an S-adenosylmethionine analogue: a tool for the functional analysis of methyltransferases.
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DOI:
10.1021/ja908995p
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发表时间:
2010-03-24
影响因子:
15
通讯作者:
Zhou, Zhaohui Sunny
Zhou, Zhaohui Sunny
中科院分区:
化学1区
文献类型:
--
作者:
Lee, Bobby W. K.;Sun, He G.;Zang, Tianzhu;Kim, Byung Ju;Alfaro, Joshua F.;Zhou, Zhaohui Sunny

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S-Adenosylmethionine (AdoMet or SAM)-dependent methyltransferases belong to a large and diverse family of group-transfer enzymes that perform vital biological functions on a host of substrates. Despite the progress in genomics, structural proteomics and computational biology, functional annotation of methyltransferases remains a challenge. Herein, we report the synthesis and activity of a new AdoMet analog functionalized with a ketone group. Using catechol O-methyltransferase (COMT, EC 2.1.1.6) and thiopurine S-methyltransferase (TPMT, EC 2.1.1.67) as model enzymes, this robust and readily accessible analog displays kinetic parameters that are comparable to AdoMet and exhibits multiple turnovers with enzyme. More importantly, this AdoMet surrogate displays the same substrate specificity as the natural methyl donor. Incorporation of the ketone group allows for subsequent modification via bio-orthogonal labeling strategies and sensitive detection of the tagged ketone products. Hence, this AdoMet analog expands the toolbox available to interrogate the biochemical functions of methyltransferases.
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