Using an enzymatic combinatorial approach to identify anticoagulant heparan sulfate structures

Area of Science:

• Biochemistry
• Glycobiology
• Medicinal Chemistry

Background:

• Heparan sulfate (HS) is crucial for physiological functions, but its specific sulfation patterns are difficult to synthesize.
• Current methods like organic synthesis yield oligosaccharides that may not fully replicate polysaccharide functions.
• Microarray techniques for HS and glycosaminoglycans are emerging for structure-function studies.

Purpose of the Study:

• To develop an enzyme-based method for synthesizing a library of heparan sulfate (HS) polysaccharides with diverse sulfation patterns.
• To overcome limitations in obtaining biologically relevant HS structures for glycomics and therapeutic development.

Main Methods:

• Utilized a combination of biosynthetic enzymes to synthesize eight unique polysaccharides.
• Focused on creating HS structures with varied sulfation patterns, including those lacking specific residues.

Main Results:

• Successfully synthesized a library of eight unique HS polysaccharides using an enzyme-based approach.
• Identified that HS polysaccharides lacking the iduronic acid residue exhibit strong binding affinity to antithrombin.
• Demonstrated high anti-factor Xa (anti-Xa) and anti-factor IIa (anti-IIa) activities in these specific HS structures.

Conclusions:

• The enzyme-based synthesis is a viable method for generating diverse HS structures.
• HS structures lacking iduronic acid show potent anticoagulant properties, suggesting therapeutic potential.
• This approach can facilitate the discovery of novel HS structures with unique biological functions.