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A novel xylB-based positive selection vector.

P E Stevis1, N W Ho

  • 1Laboratory of Renewable Resources Engineering, Purdue University, West Lafayette, Indiana 47907.

Plasmid
|July 1, 1988
PubMed
Summary
This summary is machine-generated.

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A novel positive selection method uses a lac-xylB fusion plasmid to efficiently construct genomic libraries. This method disrupts xylB expression, enabling selection on xylitol medium and reducing cloning time.

Area of Science:

  • Molecular Biology
  • Genetic Engineering
  • Microbiology

Background:

  • The Escherichia coli xylulokinase gene (xylB) is crucial for xylose metabolism.
  • Constitutive expression of xylB can be achieved using the lac promoter.
  • Previous cloning methods lacked efficient positive selection markers.

Purpose of the Study:

  • To develop a novel positive selection strategy for DNA cloning.
  • To utilize the lac-xylB fusion for efficient genomic library construction.
  • To reduce the time and effort required for routine molecular cloning experiments.

Main Methods:

  • Constructed a lac-xylB fusion plasmid (pLEK100) for constitutive xylulokinase expression.
  • Transformed a xylB- mutant E. coli strain, restoring xylose utilization (Xyl+ phenotype).

Related Experiment Videos

  • Developed a positive selection system by disrupting xylB expression via DNA insertion into unique restriction sites, enabling selection on xylitol medium.

    • Main Results:

    • Plating transformants on xylitol medium resulted in growth inhibition for plasmids without inserts, while plasmids with inserts showed growth.
    • This positive selection system successfully identified transformants containing cloned DNA fragments.
    • Three unique restriction sites (BglII, HindIII, SalI) were identified for disrupting xylB expression and enabling selection.

    Conclusions:

    • The developed lac-xylB positive selection system significantly streamlines genomic library construction and DNA cloning.
    • This method offers a considerable reduction in time and effort compared to traditional cloning techniques.
    • The system provides efficient positive selection through disruption of xylB expression, facilitating molecular biology workflows.