In:
Chemistry – A European Journal, Wiley, Vol. 28, No. 31 ( 2022-06)
Abstract:
B 12 ‐dependent radical SAM enzymes are an emerging enzyme family with approximately 200,000 proteins. These enzymes have been shown to catalyze chemically challenging reactions such as methyl transfer to sp2 ‐ and sp3 ‐hybridized carbon atoms. However, to date we have little information regarding their complex mechanisms and their biosynthetic potential. Here we show, using X‐ray absorption spectroscopy, mutagenesis and synthetic probes that the vitamin B 12 ‐dependent radical SAM enzyme TsrM catalyzes not only C ‐ but also N ‐methyl transfer reactions further expanding its synthetic versatility. We also demonstrate that TsrM has the unique ability to directly transfer a methyl group to the benzyl core of tryptophan, including the least reactive position C4. Collectively, our study supports that TsrM catalyzes non‐radical reactions and establishes the usefulness of radical SAM enzymes for novel biosynthetic schemes including serial alkylation reactions at particularly inert C−H bonds.
Type of Medium:
Online Resource
ISSN:
0947-6539
,
1521-3765
DOI:
10.1002/chem.202200627
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
1478547-X
Permalink