Saponin and Sapogenol. XLVIII. On the Constituents of the Roots of Glycyrrhiza uralensis FISCHER from Northeastern China. (2). Licorice-saponins D3, E2, F3, G2, H2, J2, and K2.
The regiospecific glycosylation of pentacyclictriterpenoids by UGT73F17, a new glycosyltransferase from Glycyrrhiza uralensis, is highlighted. UGT73F17 exhibited strict substrate specificity toward the carboxyl group at C-30/C-29 of pentacyclictriterpenoids, and showed high promiscuity to sugar donors. UGT73F17 represents the first identified triterpenoid 30/29-O-glycosyltransferase, and could be
Following the structure elucidation of licorice-saponins A3, B2, C2, D3, and E2, the structures of five more new oleanene-triterpene oligoglycosides named licorice-saponins F3 (<1>__∼), G2 (<5>__∼), H2 (<7>__∼), J2 ((10)___∼), and K2 ((12)___∼), concomitantly isolated from the root of Glycyrrhiza uralensis Fischer= (Tohoku-kanzo in Japanese), have been determined on the basis of chemical and physicochemical evidence. During the process, a facile chemical conversion method from olean-12-ene or olean-12-en-11-one oligoglycosides to an olean-11, 13-diene oligoglycoside, has been found.
GuRhaGT is the first saponin 2′′-O-rhamnosyltransferase with broad substrate promiscuity, high sugar donor- and regio-specificity. It could be an efficient biocatalyst for the synthesis of bioactive saponins.