Streamlining Sulfated Oligosaccharide and Glycan Synthesis with Engineered Mutant 6-SulfoGlcNAcases

Area of Science:

• Biochemistry
• Glycobiology
• Enzymology

Background:

• Sulfation is a crucial post-glycosylational modification (PGM) influencing biological functions.
• Understanding sulfated glycoforms and their binding proteins requires expanded enzymatic synthesis tools.

Purpose of the Study:

• To engineer a 6-SulfoGlcNAcase enzyme for direct synthesis of various sulfated glycan linkages.
• To develop a cost-effective in vitro method for generating well-defined sulfated oligosaccharides and glycoforms.

Main Methods:

• Engineering of mutant 6-SulfoGlcNAcase enzymes from Streptococcus pneumoniae.
• Utilizing pNP-6S-GlcNAc as an activated donor for enzymatic synthesis.
• Elaboration of synthesized linkages into complex N-glycan and O-glycan structures.

Main Results:

• Successful synthesis of 6S-GlcNAc-β-1,3-Gal, 6S-GlcNAc-β-1,6-GalNAc, and 6S-GlcNAc-β-1,4-GalNAc linkages.
• Generation of complex sulfated N-glycans and O-glycans of biological relevance.
• Demonstration of a simple and efficient in vitro method for sulfated glycan synthesis.

Conclusions:

• Engineered 6-SulfoGlcNAcases offer a powerful alternative to traditional sulfotransferases and glycosyltransferases.
• This method enables the production of well-defined sulfated glycans for applications in glycan arrays, remodeling, and protein-binding studies.
• The developed enzymatic approach simplifies the synthesis of complex sulfated structures, advancing glycomic research.