Abstract
We succeeded in obtaining a strain adapted to higher temperature from a thermotolerant strain, Gluconobacter frateurii CHM43, for sorbose fermentation. The adapted strain showed higher growth and l-sorbose production than original CHM43 strain at higher temperature around 38.5–40 °C. It was also shown to be useful even with the fermentation without temperature control. To understand the sorbose fermentation ability of the adapted strain at higher temperature, d-sorbitol-oxidizing respiratory chain was compared with the CHM43 strain and the adapted strain. We found that the activity of pyrroloquinoline quinone (PQQ)-dependent glycerol dehydrogenase (GLDH), which is a primary dehydrogenase of the respiratory chain and responsible for l-sorbose production, was decreased when the temperature increased, but the decreased activity of GLDH was recovered by the addition of PQQ. Since the adapted strain was found to produce more PQQ than the CHM43 strain, it was suggested that the adapted strain keeps GLDH as holoenzyme with the increased PQQ production, and thus produces more l-sorbose and grows better under higher temperature.
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Acknowledgments
This work was financially supported by the Program for Promotion of Basic Research Activities for Innovative Biosciences (PROBRAIN). We thank Hiroaki Yamamoto for his technical support.
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Hattori, H., Yakushi, T., Matsutani, M. et al. High-temperature sorbose fermentation with thermotolerant Gluconobacter frateurii CHM43 and its mutant strain adapted to higher temperature. Appl Microbiol Biotechnol 95, 1531–1540 (2012). https://doi.org/10.1007/s00253-012-4005-4
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DOI: https://doi.org/10.1007/s00253-012-4005-4