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Syngas biological transformation into hydroxyectoine.

Eva Marcos-Rodrigo¹, Raquel Lebrero¹, Raúl Muñoz¹

¹Institute of Sustainable Processes, Doctor Mergelina s/n, Valladolid 47011, Spain; Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, University of Valladolid, Doctor Mergelina s/n, Valladolid 47011, Spain.

Bioresource Technology

|November 20, 2024

Summary

This study identifies Hydrogenibacillus schlegelii as a bacterium capable of producing valuable hydroxyectoine from syngas. This research offers a sustainable route for converting waste gases into high-value compounds for pharmaceuticals.

Keywords:

Carbon monoxide Extremophiles Gas fermentation Hydrogenibacillus schlegelii Osmolytes

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Published on: October 2, 2012

Area of Science:

Biotechnology and Industrial Microbiology
Sustainable Chemistry
Synthetic Biology

Background:

Syngas from organic waste is a potential bioeconomy feedstock but yields low-value products.
Biological production of high-value osmolytes like hydroxyectoine is not yet cost-effective.

Purpose of the Study:

To identify and characterize a bacterium capable of producing hydroxyectoine from syngas.
To optimize conditions for hydroxyectoine production using syngas components.

Main Methods:

Shotgun genomics and laboratory validation were used to identify Hydrogenibacillus schlegelii.
Semi-continuous bioreactors were employed to optimize NaCl concentration, temperature, and syngas composition.

Main Results:

Hydrogenibacillus schlegelii was identified as a carboxydotrophic, halotolerant bacterium producing hydroxyectoine from H2, CO, and CO2.
Optimal hydroxyectoine production occurred at 70:10 CO:H2 (v/v) syngas composition (44.8 ± 10.1 mg hydroxyectoine·g biomass−1).
5% NaCl enhanced hydroxyectoine yield (46.7 ± 9.5 mg hydroxyectoine·g biomass−1) but reduced gas consumption.

Conclusions:

This study presents a novel pathway for syngas valorization into hydroxyectoine.
The findings open avenues for developing new cell factories for pharmaceutical production using syngas.