Bioproduction strategies for rare hexose sugars

Area of Science:

• Biochemistry
• Metabolic Engineering
• Synthetic Biology

Background:

• Ketohexoses are important sugar molecules with various applications.
• Efficient bioproduction methods for rare ketohexoses are limited.
• Existing methods often lack the ability to produce all ketohexose isomers.

Purpose of the Study:

• To develop a comprehensive strategy for the bioproduction of all ketohexoses.
• To explore the interconversion pathways between ketohexoses and hexitols.
• To identify routes for producing rare D- and L-hexose sugars.

Main Methods:

• Utilized D-tagatose 3-epimerase for C-3 epimerization of ketohexoses.
• Employed oxidoreductases for reversible oxidation-reduction reactions between ketohexoses and hexitols.
• Designed a biochemical network connecting ketohexoses and hexitols through 20 reactions.
• Incorporated aldose isomerases for ketohexose to aldohexose conversion.

Main Results:

• Successfully designed a bioproduction strategy for all rare ketohexoses.
• Demonstrated the utility of hexitols as key intermediates in a symmetric ring structure.
• Identified 20 biochemical reactions essential for the proposed bioproduction network.
• Revealed four distinct pathways connecting the D-hexose and L-hexose metabolic worlds.

Conclusions:

• The developed strategy enables the bioproduction of all ketohexoses and rare hexose sugars.
• The biocatalytic approach offers a versatile platform for sugar synthesis.
• The findings provide insights into stereospecific sugar interconversions and L-sugar production.