Abstract
Rhizopus oryzae is becoming more important due to its ability to produce an optically pure l-lactic acid. However, fermentation by Rhizopus usually suffers from low yield because of production of ethanol as a byproduct. Limiting ethanol production in living immobilized R. oryzae by inhibition of alcohol dehydrogenase (ADH) was observed in shake flask fermentation. The effects of ADH inhibitors added into the medium on the regulation of ADH and lactate dehydrogenase (LDH) as well as the production of cell biomass, lactic acid, and ethanol were elucidated. 1,2-diazole and 2,2,2-trifluroethanol were found to be the effective inhibitors used in this study. The highest lactic acid yield of 0.47 g/g glucose was obtained when 0.01 mM 2,2,2-trifluoroethanol was present during the production phase of the pregrown R. oryzae. This represents about 38% increase in yield as compared with that from the simple glucose fermentation. Fungal metabolism was suppressed when iodoacetic acid, N-ethylmaleimide, 4,4′-dithiodipyridine, or 4-hydroxymercury benzoic acid were present. Dramatic increase in ADH and LDH activities but slight change in product yields might be explained by the inhibitors controlling enzyme activities at the pyruvate branch point. This showed that in living R. oryzae, the inhibitors regulated the flux through the related pathways.
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Acknowledgments
This work has been supported by Thailand Research Fund and the Graduate School of Chulalongkorn University via the TRF Master Research Grant (MRG-WII51E053). Partial funding from the National Research University Project of Commission on Higher Education (CHE) and the Ratchadapiseksomphot Endowment Fund (AM1026A) is also acknowledged. The authors appreciated US Department of Agriculture for providing the fungal strain used in this study. We thank Professor Shang-Tian Yang, Ph.D. (Department of Chemical and Biomolecular Engineering, The Ohio State University, USA) for his valuable guidance and comments throughout lactic acid fermentation study. English proof reading and fruitful suggestion provided by Professor Anthony Whalley, Ph.D. (School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, UK) are highly appreciated.
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Thitiprasert, S., Sooksai, S. & Thongchul, N. In Vivo Regulation of Alcohol Dehydrogenase and Lactate Dehydrogenase in Rhizopus Oryzae to Improve l-Lactic Acid Fermentation. Appl Biochem Biotechnol 164, 1305–1322 (2011). https://doi.org/10.1007/s12010-011-9214-2
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DOI: https://doi.org/10.1007/s12010-011-9214-2