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.
KITAGAWA, ISAO;ZHOU, JUN LIANG;SAKAGAMI, MASAHIRO;UCHIDA, EMIKO;YOSHIKAWA+, CHEM. AND PHARM. BULL., 39,(1991) N, C. 244-246
作者:KITAGAWA, ISAO、ZHOU, JUN LIANG、SAKAGAMI, MASAHIRO、UCHIDA, EMIKO、YOSHIKAWA+
DOI:——
日期:——
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.
Following the characterization of licorice-saponins A3 (2), B2 (3), and C2 (4), the chemical structures of licorice-saponins D3 (5), E2 (6), F3 (7), G2 (8), H2 (9), J2 (10), and K2 (11), seven of the ten oleanane-type triterpene oligoglycosides isolated from the air-dried roots of Glycyrrhiza uralensis FISCHER collected in the northeastern part of China, were investigated. On the basis of chemical and physicochemical evidence, the structures of licorice-saponins D3, E2, F3, G2, H2, J2, and K2 have been determined to be expressed as 3β-[α-L-rhamnopyranosyl(1→2)-β-D-glucuronopyranosyl(1→2)-β-D-glucuronopyranosyloxy]-22β-acetoxyolean-12-en-30-oic acid (5), 3-O-[β-D-glucuronopyranosyl(1→2)-β-D-glucuronopyranosyl]glabrolide (6), 3-O-[α-L-rhamnopyranosyl(1→2)-β-D-glucuronopyranosyl-(1→2)-β-D-glucuronopyranosyl]-11-deoxoglabrolide (7), 24-hydroxyglycyrrhizin (8), 3-O-[β-D-glucuronopyranosyl-(1→2)-β-D-glucuronopyranosyl]liquiritic acid (9), 24-hydroxy-11-deoxoglycyrrhizin (10), and 3β-[β-D-glucuronopyranosyl(1→2)-β-D-glucuronopyranosyloxy]-24-hydroxyoleana-11, 13(18)-dien-30-oic acid (11), respectively.