Bacterial CMP-sialic acid synthetases: production, properties, and applications

Area of Science:

• Biochemistry and Molecular Biology
• Microbiology
• Glycobiology

Background:

• Sialic acids are critical nine-carbon sugars on cell surfaces, influencing cell adhesion, signaling, and glycoprotein stability.
• Bacterial N-acetylneuraminic acid (Neu5Ac) polymers are key virulence factors.
• Cytidine 5 '-monophosphate (CMP)-N-acetylneuraminic acid synthetase (CSS) synthesizes the essential sialic acid donor molecule.

Purpose of the Study:

• To review the sources, functions, and biotechnological applications of bacterial CSS enzymes.
• To provide an overview of characterized bacterial CSS enzymes from pathogenic and nonpathogenic species.
• To discuss the catalytic properties and classification of bacterial CSS enzymes.

Main Methods:

• Literature review of bacterial CSS enzymes.
• Analysis of enzyme properties including catalytic mechanisms, divalent cation dependence, and optimal temperature/pH.
• Categorization of enzymes based on molecular weight and functional characteristics.

Main Results:

• Several bacterial CSS enzymes have been described, from species including Neisseria meningitidis, Escherichia coli, and Clostridium thermocellum.
• Bacterial CSS enzymes share common catalytic properties but differ in molecular weight, classifying them as smaller or larger enzymes.
• Larger CSS enzymes can exhibit bifunctional activity, including acetylhydrolase and sugar nucleotidyltransferase functions.

Conclusions:

• Bacterial CSS enzymes are crucial for synthesizing sialic acid derivatives.
• Understanding bacterial CSS enzymes aids in exploring their biotechnological potential.
• These enzymes are significant tools for the chemoenzymatic synthesis of valuable sialooligosaccharides.