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.
Umwandlung von Kr�tengiften (Bufadienoliden) durch Mikroorganismen: I. 12?-Hydroxylierung von Bufalin5. Mitteilung �ber Reaktionen mit Mikroorganismen
作者:Ch. Tamm、Alice Gubler
DOI:10.1002/hlca.19590420212
日期:——
Bufalin (111) wurde durch 12β-Hydroxylierung mit Kulturen vonFusarium lini (BOLLEY) in 12β-Hydroxybufalin (5) übergeführt, dessen Konstitution durch Abbau zum bekannten 3β,12βDiacetoxy-14-hydroxy-5β,14β-ätiansäure-methylester (VII)bewiesen wurde. 3-Dehydro-bufalin (= Bufalon) (VIII) lieferte beim Umsatz rnitF. lini3-Dehydro-12β-hydroxy-bufalin (IX) sowie ein Mischkristallisat von 2 weite-ren, nicht
3-epi-Bufadienolides with unique structures and lower toxicities have been isolated from toad bile. A short-chain dehydrogenase/reductase, HSE-1, was cloned from a toad liver cDNA library and verified to regulate the epimerization of bufadienolides.
configuration at C-3 and the A/B fusion mode. 3β-OH and A/B ring cis fusion are favoured by OleD (ASP). An epoxide ring at C-14 and C-15 further increases the bioconversion rate; while an acetyl group at C-16 and lactone ring type at C-17 did not influence the biotransformation. A high conversion rate corresponded to a low Km value. A molecular docking simulation showed that filling of hydrophobic pocket
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.