Semi-synthetic heparinoids.

Area of Science:

• Biochemistry
• Carbohydrate Chemistry
• Medicinal Chemistry

Background:

• Bacterial polysaccharide K5 from Escherichia coli serves as a versatile precursor.
• Heparin and heparan sulfate are crucial glycosaminoglycans with significant biological roles.
• Existing synthesis methods may lack efficiency or specificity.

Purpose of the Study:

• To develop a novel chemical-enzymatic approach for synthesizing heparin/heparan sulfate-like molecules.
• To create distinct families of sulfated compounds with varying uronic acid compositions.
• To explore the diverse biological activities of these novel derivatives.

Main Methods:

• Modification of bacterial polysaccharide K5 using chemical and enzymatic techniques.
• Synthesis of two distinct families of sulfated compounds based on uronic acid content.
• Utilizing immobilized recombinant C5 epimerase for iduronic acid epimerization.

Main Results:

• Successful synthesis of heparin/heparan sulfate-like molecules from polysaccharide K5.
• Two families of compounds were generated: one with glucuronic acid, the other with glucuronic and iduronic acids.
• Synthesized derivatives exhibited varied anticoagulant and nonanticoagulant biological activities, including antitumor, antiviral, and anti-inflammatory effects.

Conclusions:

• The developed chemical-enzymatic technology offers a novel route to heparin/heparan sulfate analogs.
• The ability to control uronic acid content allows for tailoring of biological activities.
• These K5 derivatives represent promising candidates for therapeutic applications targeting cancer, viral infections, and inflammation.