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Superpolylinkers in cloning and expression vectors.

J Brosius1

  • 1Fishberg Research Centre for Neurobiology, Mt. Sinai School of Medicine, New York, NY 10029.

DNA (Mary Ann Liebert, Inc.)
|December 1, 1989
PubMed
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New DNA polylinkers were created for genetic engineering, offering numerous restriction sites for cloning. These versatile DNA tools were integrated into various E. coli vectors, expanding their utility in molecular biology applications.

Area of Science:

  • Molecular Biology
  • Genetic Engineering
  • Biotechnology

Background:

  • DNA polylinkers are essential tools in molecular cloning for inserting DNA fragments.
  • Existing polylinkers may have limitations in the number and type of restriction sites available.
  • The development of versatile polylinkers can enhance cloning efficiency and experimental flexibility.

Purpose of the Study:

  • To construct and characterize versatile DNA polylinkers with a comprehensive set of restriction enzyme recognition sites.
  • To integrate these novel polylinkers into commonly used bacterial cloning and expression vectors.
  • To evaluate the utility and performance of the modified vectors in genetic engineering applications.

Main Methods:

  • Construction of DNA polylinkers exceeding 300 bp, incorporating recognition sites for known and potentially novel palindromic hexameric restriction enzymes.

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  • Insertion of polylinkers into various Escherichia coli vectors including pBluescript, pUC, and expression vectors.
  • Characterization of modified vectors, including assessment of insert detection via color discrimination and evaluation in different bacterial hosts.

    • Main Results:

    • Successfully constructed versatile DNA polylinkers containing numerous restriction sites, including 64 uninterrupted hexameric sites, interrupted palindromes, nonpalindromic sequences, and 8 bp recognition sites.
    • Integrated polylinkers into multiple cloning and expression vectors, creating new variants like pSLJ10, pSL250-300, pSL180, pSL190, pSL1180, pSL1190, pSE1200, pSE220, pSE280, and pSE380.
    • Demonstrated subtle color discrimination for insert presence/absence in pSL300 and expanded expression vector utility beyond specific E. coli strains.

    Conclusions:

    • The developed versatile DNA polylinkers significantly expand the cloning capacity and flexibility of standard bacterial vectors.
    • These modified vectors offer broad applications in genetic engineering, facilitating complex molecular cloning and expression studies.
    • The inclusion of a lac repressor gene in pSE380 enhances the versatility of expression systems for diverse bacterial hosts.