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Protein export elements from Lactococcus lactis.

G Perez-Martinez1, J Kok, G Venema

  • 1Department of Genetics, Centre of Biological Sciences, Haren, The Netherlands.

Molecular & General Genetics : MGG
|September 1, 1992
PubMed
Summary
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Researchers identified novel bacterial export elements from Lactococcus lactis DNA. These elements efficiently secrete heterologous proteins in L. lactis, with one enabling starch utilization.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Identifying and characterizing protein export signals is crucial for microbial biotechnology.
  • Lactococcus lactis is a key organism in food fermentation, but its protein secretion systems are not fully understood.

Purpose of the Study:

  • To identify and characterize novel functional export signal sequences from Lactococcus lactis chromosomal DNA.
  • To evaluate the efficiency and host-specificity of these identified export elements in different bacterial hosts.

Main Methods:

  • Utilized broad-host-range plasmids with reporter genes (alpha-amylase, beta-lactamase) to screen L. lactis chromosomal DNA fragments.
  • Assessed reporter protein export in Escherichia coli, Bacillus subtilis, and L. lactis.
  • Performed nucleotide sequence analysis of identified export elements.

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Main Results:

  • Several DNA fragments encoding functional export elements were identified and confirmed in E. coli.
  • Selected export elements, particularly AL9 and BL1, demonstrated high efficiency in L. lactis for secreting heterologous proteins (B. licheniformis alpha-amylase, E. coli TEM-beta-lactamase).
  • Export element AL9 enabled L. lactis to utilize starch as a sole carbon source, indicating robust secretion capabilities.

Conclusions:

  • Novel, efficient signal sequences for protein export in L. lactis have been identified from its chromosomal DNA.
  • The efficiency of these export elements is host-dependent and influenced by the reporter gene.
  • These findings have significant implications for enhancing heterologous protein production in L. lactis and related bacteria.