Abstract
In lactobacilli, CcpA is known to modulate the expression of genes involved in sugar metabolism, stress response and aerobic adaptation. This study aimed to evaluate a ccpA mutant of Lacticaseibacillus casei BL23 to increase lactic acid production using cheese whey. The ccpA derivative (BL71) showed better growth than the L. casei wild-type in the whey medium. In a stirred tank reactor, at 48 h, lactate production by BL71 was eightfold higher than that by BL23. In batch fermentations, the final values reached were 44.23 g L−1 for BL71 and 27.58 g L−1 for BL23. Due to a decrease in the delay of lactate production in the mutant, lactate productivity increased from 0.17 g (L.h)−1 with BL23 to 0.80 g (L.h)−1 with BL71. We found that CcpA would play additional roles in nitrogen metabolism by the regulation of the proteolytic system. BL71 displayed higher activity of the PepX, PepQ and PrtP enzymes than BL23. Analysis of prtP expression confirmed this deregulation in BL71. Promoter analysis of the prtP gene revealed CcpA binding sites with high identity to the cre consensus sequence and the interaction of CcpA with this promoter was confirmed in vitro. We postulate that deregulation of the proteolytic system in BL71 allows a better exploitation of nitrogen resources in cheese whey, resulting in enhanced fermentation capacity. Therefore, the ccpA gene could be a good target for future technological developments aimed at effective and inexpensive lactate production from dairy industrial wastes.
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Funding
The present report was supported by grants from the Universidad de Buenos Aires (UBA) (UBACyT 20020170200329BA and 20020170100019BA) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. JFM is a graduate fellow of CONICET; VMG is a member of CSIC (Spain); MVC and DML are members of INTI (Argentina) and MMP, SMR and MCA are members of CONICET (Argentina).
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Catone, M.V., Palomino, M.M., Legisa, D.M. et al. Lactic acid production using cheese whey based medium in a stirred tank reactor by a ccpA mutant of Lacticaseibacillus casei. World J Microbiol Biotechnol 37, 61 (2021). https://doi.org/10.1007/s11274-021-03028-z
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DOI: https://doi.org/10.1007/s11274-021-03028-z