Polyketides and Anthranilic Acid Possessing 6-Deoxy-α-<scp>l</scp>-talopyranose from a <i>Streptomyces</i> Species
作者:Sangkeun Son、Sung-Kyun Ko、Mina Jang、Jae Kyoung Lee、Min Cheol Kwon、Dong Hyo Kang、In-Ja Ryoo、Jung-Sook Lee、Young-Soo Hong、Bo Yeon Kim、Jae-Hyuk Jang、Jong Seog Ahn
DOI:10.1021/acs.jnatprod.6b01059
日期:2017.5.26
A bioassay-guided investigation in conjunction with chemical screening led to the isolation of three new glycosides, ulleungoside (1), 2-methylaminobenzoyl 6-deoxy-alpha-L-talopyranoside (2), and naphthomycinoside (3), along with three known secondary metabolites (5-7) from Streptomyces sp. KCB13F030. Their structures were elucidated by detailed NMR and MS spectroscopic analyses. Absolute configurational analysis of the sugar units based on the magnitudes of the coupling constants, NOESY correlations, chemical derivatization, and optical rotation measurements revealed that compounds 1-3 and 5 incorporate the rare deoxyhexose 6-deoxy-alpha-L-talopyranose. The absolute configuration of a polyketide extender unit of 3 was determined by applying the J-based configuration analysis and modified Mosher's method. Ulleungoside (1) and naphthomycin A (7) showed activity. Further bioevaluation revealed that compounds 1 and cell lines, and compounds 5 and 6, which are members of the 2 plying the J-based configuration analysis and modified Mosher's in vitro inhibitory effects against indoleamine 2,3-dioxygenase 7 had moderate antiproliferative activities against several cancer piericidin family, induced autophagosome accumulation.