Biochemical and Structural Studies of the Carminomycin 4-<i>O</i>-Methyltransferase DnrK
作者:Elnaz Jalali、Fengbin Wang、Brooke R. Overbay、Mitchell D. Miller、Khaled A. Shaaban、Larissa V. Ponomareva、Qing Ye、Hoda Saghaeiannejad-Esfahani、Minakshi Bhardwaj、Andrew D. Steele、Christiana N. Teijaro、Ben Shen、Steven G. Van Lanen、Qing-Bai She、S. Randal Voss、George N. Phillips、Jon S. Thorson
DOI:10.1021/acs.jnatprod.3c00947
日期:2024.4.26
4-O-methyltransferase DnrK are described, with an emphasis on interrogating the acceptor substrate scope of DnrK. Specifically, the evaluation of 100 structurally and functionally diverse naturalproducts and naturalproduct mimetics revealed an array of pharmacophores as productive DnrK substrates. Representative newly identified DnrK substrates from this study included anthracyclines, angucyclines, anthraquinone-fused
A new dimeric isocoumarin, bireticulol, was isolated from the terrestrial Streptomyces sp. and characterized as a 5-5â² dimer of reticulol. In addition, reticulol and 8-hydroxy-6,7-dimethoxy-3-methyl isocoumarin, together with other known polyketides piericidin A, 2â²-(2-hydroxyphenyl)-2,4â²-bibenzoxazole-4-carboxylic acid methyl ester (UK-1) and 3-benzyl-4-hydroxy-5-methyldihydrofuran-2-one were also obtained. Bireticulol exhibited cytotoxic effects against KB (human epidermoid carcinoma, ATCC CCL-17) and NCI-H187 (human small cell lung cancer, ATCC CRL-5804) cell lines with IC50 values of 24.4 and 8.31âμgâmlâ1, respectively.