Enzyme-catalyzed transfer of a ketone group from an S-adenosylmethionine analogue: a tool for the functional analysis of methyltransferases.
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 analogue 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 analogue 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 analogue expands the toolbox available to interrogate the biochemical functions of methyltransferases.
Lee
Bobby W K
BW
The Barnett Institute and Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115, USA.
Sun
He G
HG
Zang
Tianzhu
T
Kim
Byung Ju
BJ
Alfaro
Joshua F
JF
Zhou
Zhaohui Sunny
ZS
D000818:Animals; D055162:Biocatalysis; D057075:Enzyme Assays / Q000379:methods*; D006801:Humans; D006834:Hydrazines / Q000737:chemistry; D006898:Hydroxylamines / Q000737:chemistry; D007659:Ketones / Q000737:chemistry / Q000378:metabolism*; D008780:Methyltransferases / Q000378:metabolism*; D012436:S-Adenosylmethionine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism*; D013379:Substrate Specificity
D006834:Hydrazines; D006898:Hydroxylamines; D007659:Ketones; C029424:hydrazine; D012436:S-Adenosylmethionine; D008780:Methyltransferases