Download MendeleyFunctional investigation of the SAM-dependent methyltransferase RdmB in anthracycline biosynthesis.
Sang, M., Yang, Q., Guo, J., Feng, P., Ma, W., Zhang, W.(2025) Synth Syst Biotechnol 10: 102-109
- PubMed: 39308748
- DOI: https://doi.org/10.1016/j.synbio.2024.09.002
- Primary Citation of Related Structures:
9J56 - PubMed Abstract:
A novel sub-class of S -adenosyl-l-methionine (SAM)-dependent methyltransferases catalyze atypical chemical transformations in the biosynthesis of anthracyclines. Exemplified by RdmB from Streptomyces purpurascens, it was found with 10-decarboxylative hydroxylation activity on anthracyclines. We herein investigated the catalytic activities of RdmB and discovered a previously unknown 4- O -methylation activity. The site-directed mutagenesis studies proved that the residue at position R307 and N260 are vital for the decarboxylative hydroxylation and 4- O -methylation, respectively, which define two distinct catalytic centers in RdmB. Furthermore, the multifunctionality of RdmB activity was found as cofactor-dependent and stepwise. Our findings expand the versatility and importance of methyltransferases and should aid studies to enrich the structural diversity and bioactivities of anthracyclines.
Organizational Affiliation:
State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, 266237, China.
