Biotransformation of steroidal ruscogenins (neoruscogenin and ruscogenin) was carried out with Cunninghamella blakesleeana NRRL 1369 and endophytic fungus Neosartorya hiratsukae yielding mainly P450 monooxygenase products together with a glycosylated compound. Fermentation of ruscogenins (75:25, neoruscogenin-ruscogenin mixture) with C. blakesleeana yielded 8 previously undescribed hydroxylated compounds. Furthermore, microbial transformation of neoruscogenin by endophytic fungus N. hiratsukaЖe afforded three previously undescribed neoruscogenin derivatives. While hydroxylation at C-7, C-12, C-14, C-21 with further oxidation at C-1 and C-7 were observed with C. blakesleeana, N. hiratsukae biotransformation provided C-7 and C-12 hydroxylated compounds along with C-12 oxidized and C-1(O) glycosylated derivatives. The structures of the metabolites were elucidated by 1-D (1H, 13C and DEPT135) and 2-D NMR (COSY, HMBC, HMQC, NOESY, ROESY) as well as HR-MS analyses.

Cunninghamella blakesleeana, microbial biotransformation, neoruscogenin, Neosartorya hiratsukae, ruscogenins, ruscus

• Compound ID: 21777
  

  a-D-Glcp-(1-1)-Subst Subst = neoruscogenin = SMILES [H][C@]1(O[C@](OCC2=C)(CC2)[C@H]3C)C[C@@]4([H])[C@]5([H])CC=C6C{3}[C@@H](O)C{1}[C@@H](O)[C@]6(C)[C@@]5([H])CC[C@]4(C)[C@]13[H]

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  Structure type: monomer ; 613.3353 [M+Na]+
  C33H50O9
  Compound class: glycoside
  
   
  
  Neosartorya hiratsukae
  CSDB ID 49072 (all data & tools)