Enzymatic glycosylation of oleanane-type triterpenoids

Area of Science:

• Natural Product Chemistry
• Biocatalysis
• Medicinal Chemistry

Background:

• Glycosylation enhances natural product druggability by increasing water solubility.
• Oleanane-type triterpenoids are a class of natural products with potential therapeutic applications.
• Enzymatic glycosylation offers a sustainable and efficient method for modifying natural products.

Purpose of the Study:

• To investigate the glycosylation of oleanane-type triterpenoids using a recombinant microbial glycosyltransferase, YjiC1.
• To isolate and characterize novel glycosylated triterpenoid derivatives.
• To evaluate the improved physicochemical properties and biological activities of the synthesized compounds.

Main Methods:

• Recombinant expression and purification of microbial glycosyltransferase YjiC1.
• Enzymatic O-glycosylation reaction of oleanane-type triterpenoids.
• Liquid chromatography-mass spectrometry (LC/MS) for preliminary screening and product analysis.
• Isolation and structural elucidation of new compounds using spectroscopic methods.

Main Results:

• YjiC1 demonstrated robust O-glycosylation capabilities for oleanane-type triterpenoids.
• Two new glycosylated triterpenoids (2a and 3a) and one known compound (1a) were successfully synthesized and isolated.
• The resulting glycosides exhibited significantly improved water solubility compared to the parent triterpenoids.
• Compound 3a displayed moderate anti-HIV activity at a concentration of 100 μM.

Conclusions:

• The recombinant microbial glycosyltransferase YjiC1 is an effective biocatalyst for the synthesis of triterpenoid glucosides.
• This enzymatic approach provides a facile and efficient method for improving the druggability of oleanane-type triterpenoids.
• The synthesized compounds hold potential for further development as therapeutic agents, particularly compound 3a for anti-HIV applications.