Polyol conversion specificity of Bacillus pallidus.

Area of Science:

• Microbiology
• Biochemistry
• Carbohydrate Chemistry

Background:

• Polyols and their derivatives are crucial in various biological and industrial applications.
• The enzymatic conversion of rare sugar alcohols remains a significant challenge in biotechnology.
• Understanding microbial metabolic pathways offers potential for novel biotransformations.

Purpose of the Study:

• To investigate the conversion specificity of Bacillus pallidus Y25 for rare polyols.
• To identify the enzymes responsible for polyol transformation in B. pallidus.
• To explore the potential of B. pallidus for producing valuable aldoses from sugar alcohols.

Main Methods:

• Cultivation of Bacillus pallidus Y25.
• Incubation of bacterial cells with various rare polyols (allitol, L-mannitol, D/L-talitol, D-iditol).
• Analysis of conversion products using chromatographic and spectroscopic techniques.

Main Results:

• B. pallidus Y25 demonstrated the ability to convert allitol, L-mannitol, D/L-talitol, and D-iditol into their corresponding ketoses.
• The bacterium possesses at least two distinct polyol dehydrogenases with specificity for D-erythro and D-threo configured polyols.
• Intrinsic isomerases within B. pallidus facilitated the direct conversion of polyols to aldoses, including L-xylose, L-talose, D-altrose, and L-glucose.

Conclusions:

• Bacillus pallidus Y25 exhibits remarkable enzymatic machinery for the biotransformation of rare sugar alcohols.
• The identified polyol dehydrogenases and isomerases offer a promising biocatalytic system for producing diverse aldoses.
• This study highlights the potential of microbial biotransformation for sustainable production of valuable carbohydrates.