Food Science and Biotechnology

Korean Society of Food Science and Technology (한국식품과학회)
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Use of the Cellulase Gene as a Selection Marker of Food-grade Integration System in Lactic Acid Bacteria

  • Lee, Jung-Min (Department of Agricultural Biotechnology, Seoul National University) ;
  • Jeong, Do-Won (Center for Food and Drug Analysis, Gyeongin Regional Food & Drug Administration) ;
  • Lee, Jong-Hoon (Department of Food Science and Biotechnology, Kyonggi University) ;
  • Chung, Dae-Kyun (School of Biotechnology and Institute of Life Science and Resources, Kyung Hee University) ;
  • Lee, Hyong-Joo (Department of Agricultural Biotechnology, Seoul National University)
  • Published : 2008.12.31
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Abstract

The application of the cellulase gene (celA) as a selection marker of food-grade integration system was investigated in Lactobacillus (Lb.) casei, Lactococcus lactis, and Leuconostoc (Leu.) mesenteroides. The 6.0-kb vector pOC13 containing celA from Clostridium thermocellum with an integrase gene and a phage attachment site originating from bacteriophage A2 was used for site-specific recombination into chromosomal DNA of lactic acid bacteria (LAB). pOC13 was also equipped with a broad host range plus replication origin from the lactococcal plasmid pWV01, and a controllable promoter of nisA ($P_{nisA}$) for the production of foreign proteins. pOC13 was integrated successfully into Lb. casei EM116, and pOC13 integrants were easily detectable by the formation of halo zone on plates containing cellulose. Recombinant Lb. casei EM 116::pOC13 maintained these traits in the absence of selection pressure during 100 generations. pOC13 was integrated into the chromosome of L. lactis and Leu. mesenteroides, and celA acted as an efficient selection marker. These results show that celA can be used as a food-grade selection marker, and that the new integrative vector could be used for the production of foreign proteins in LAB.

Keywords

References

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