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. 1989 Sep;55(9):2130–2137. doi: 10.1128/aem.55.9.2130-2137.1989

Integration and expression of alpha-amylase and endoglucanase genes in the Lactobacillus plantarum chromosome.

T Scheirlinck 1, J Mahillon 1, H Joos 1, P Dhaese 1, F Michiels 1
PMCID: PMC203044  PMID: 2679379

Abstract

A commercial grass silage starter strain of Lactobacillus plantarum was transformed by high-frequency electroporation with plasmids containing an alpha-amylase gene from Bacillus stearothermophilus and an endoglucanase gene from Clostridium thermocellum. Both genes were expressed from their native regulatory signals, and active enzymes were found in the supernatant. However, the segregational stability of the transforming plasmids was rather low. Therefore, the transforming genes were inserted in the L. plantarum chromosome by means of single homologous recombination. In the majority of the transformants, this led to extremely stable segregation and expression of the transforming genes, without generating secondary mutations in the host. Increased selective pressure led to tandem amplification of the transforming DNA. The transformed strains demonstrated the ability of L. plantarum to express heterologous gene products; they can be used to detect the inoculum in silage ecology studies; and they demonstrate the feasibility of engineering truly cellulolytic silage starter bacteria.

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Selected References

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