Abstract
Recombinant vector pJLECit (8,232 bp) was constructed using citrate permease gene contained in the 3,919-bp fragment of plasmid pCM1 (8,280 bp) isolated from Lactococcus lactis subsp. lactis biovar diacetylactis NIAI N-7, repA and ori from pLU1, and pMB1 ori and the erythromycin resistance gene from pJIR418. Lactobacillus casei L-49-4 (plasmid-free mutant of strain L-49) harboring the constructed pJLECit converted citrate into diacetyl/acetoin. Citrate uptake rate of resting cells was the highest at pH 5.5 and 10 mM citrate concentration. Diacetyl formation activity by the cell-free extracts of Lb. casei L-49-4 (pJLECit) grown in de Man–Rogosa–Sharpe (MRS) broth was higher than that of cells grown in MRS broth without citrate. On the other hand, diacetyl reductase activity of cells grown in MRS broth was lower than that of cells grown in MRS broth without citrate.







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Part of this study was supported by the regional innovative consortium project of the Ministry of Economy, Trade and Industry, Japan.
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An, HY., Tsuda, H. & Miyamoto, T. Expression of citrate permease gene of plasmid pCM1 isolated from Lactococcus lactis subsp. lactis biovar diacetylactis NIAI N-7 in Lactobacillus casei L-49-4. Appl Microbiol Biotechnol 74, 609–616 (2007). https://doi.org/10.1007/s00253-006-0702-1
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DOI: https://doi.org/10.1007/s00253-006-0702-1


