Microbial Transformation of Protopanaxadiol and Protopanaxatriol Derivatives with <i>Mycobacterium</i> sp. (NRRL B-3805)
作者:K. C. Wang、Perng-Haur Wang、Shoei-Sheng Lee
DOI:10.1021/np970331y
日期:1997.12.1
Transformation of the dammaranes (20R)-dihydroprotopanaxadiol (3) and a mixture of(20S)and (20R)-dihydroprotopanaxatriol (4a, 4b) by Mycobacterium sp. (NRRL B-3805) yielded the corresponding 3-oxo-(5 and 7) and 3-oxo-25-hydroxylated (6 and 8) derivatives. Incubation of (20R)-hydroxydammarane-3,12-dione (9), a pyridinium chlorochromate oxidation product, of 3, with the same microorganism yielded 3 beta,20R-dihydroxydammaran-12-one (10); 20R,24-dihydroxypropakisnordammarane-3,12-dione (11); and 3 beta,20R,24-trihydroxypropakisnordammaran-12-one (12). These results indicated that the uptake of the compound into the bacterial cells might be a critical factor in the side-chain degradation process because it occurred only in the lass polar compound 9. it has also been demonstrated that hydroxylation at C-25 by this microorganism using 3 and 4 represents a diverse reaction mechanism.