UGT74AN1, a Permissive Glycosyltransferase from Asclepias curassavica for the Regiospecific Steroid 3-O-Glycosylation
摘要:
A permissive steroid glycosyltransferase (UGT74AN1) from Asclepias curassavica exhibited robust capabilities for the regiospecific C3 glycosylation of cardiotonic steroids and C-21 steroid precursors, and unprecedented promiscuity toward 53 structurally diverse natural and unnatural compounds to form O-, N-, and S-glycosides, along with the catalytic reversibility for a one-pot transglycosylation reaction. These findings highlight UGT74AN1 as the first regiospecific catalyst for cardiotonic steroid C3 glycosylation and exhibit significant potential for glycosylation of diverse bioactive molecules in drug discovery.
3'-epi-19-Norafroside and 12.BETA.-Hydroxycoroglaucigenin from Asclepias curassavica.
作者:Fumiko ABE、Yujiro MORI、Tatsuo YAMAUCHI
DOI:10.1248/cpb.39.2709
日期:——
3'-epi-19-Norafraside, a 19-norcardenolide glycoside with dual linkages between a cardenolide and 4, 6-dideoxy-galactos-2-ulose, and 12β-hydroxycoroglausigenin were newly isolated from the stems of Asclepias curassavica, along with known glycosides and free cardenolides. The structures were determined by spectral and chemical methods.
A permissive steroid glycosyltransferase (UGT74AN1) from Asclepias curassavica exhibited robust capabilities for the regiospecific C3 glycosylation of cardiotonic steroids and C-21 steroid precursors, and unprecedented promiscuity toward 53 structurally diverse natural and unnatural compounds to form O-, N-, and S-glycosides, along with the catalytic reversibility for a one-pot transglycosylation reaction. These findings highlight UGT74AN1 as the first regiospecific catalyst for cardiotonic steroid C3 glycosylation and exhibit significant potential for glycosylation of diverse bioactive molecules in drug discovery.