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Expression plasmid for B. subtilis.

P S Lovett1, R G Schoner

  • 1Department of Biological Sciences, University of Maryland Baltimore County 21228.

Gene Amplification and Analysis
|January 1, 1983
PubMed
Summary
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Foreign gene expression in Bacillus subtilis is possible using Bacillus regulatory elements. However, transcriptional and translational barriers limit the expression of genes from gram-negative bacteria like E. coli.

Area of Science:

  • Molecular Biology
  • Microbial Genetics
  • Gene Expression

Background:

  • Heterologous gene expression in Bacillus subtilis (B. subtilis) is a key area in biotechnology.
  • Understanding the limitations of expressing foreign genes, particularly from Escherichia coli (E. coli), is crucial for optimizing protein production.

Purpose of the Study:

  • To investigate the barriers to heterologous gene expression in B. subtilis.
  • To identify the specific transcriptional and translational challenges encountered when expressing E. coli genes in B. subtilis.

Main Methods:

  • Analysis of Bacillus and E. coli promoter sequences and their recognition by B. subtilis RNA polymerase in vitro.
  • Assessment of the in vitro translation activity of B. subtilis ribosomes with mRNA from gram-negative bacteria.

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Main Results:

  • Bacillus promoters share similarities with E. coli promoters, yet B. subtilis RNA polymerase poorly recognizes E. coli promoters in vitro.
  • Ribosomes from gram-positive bacteria, including B. subtilis, exhibit low activity in translating mRNA from gram-negative species.
  • This translational inefficiency is attributed to the inability of B. subtilis ribosomes to effectively utilize weak ribosome binding sites common in gram-negative mRNA.

Conclusions:

  • Transcriptional barriers exist, as indicated by the poor recognition of E. coli promoters by B. subtilis RNA polymerase.
  • Translational barriers are also significant, stemming from the inefficient interaction between B. subtilis ribosomes and gram-negative mRNA.
  • Overcoming these transcriptional and translational hurdles is necessary for successful heterologous gene expression in B. subtilis.