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Lambda ZAP: improved strategies for expression library construction and use.

R Webb1, K J Reddy, L A Sherman

  • 1Division of Biological Sciences, University of Missouri, Columbia 65211.

DNA (Mary Ann Liebert, Inc.)
|January 1, 1989
PubMed
Summary
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This study presents an efficient method for constructing lambda ZAP genomic expression libraries. The optimized strategy simplifies troubleshooting and facilitates the cloning and characterization of gene inserts, as demonstrated with cyanobacterial species.

Area of Science:

  • Molecular Biology
  • Genomics
  • Biotechnology

Background:

  • Construction of genomic expression libraries is crucial for functional genomics.
  • Lambda ZAP vectors are widely used for creating such libraries.
  • Efficient library construction requires optimized protocols for DNA fragmentation, ligation, and cloning.

Purpose of the Study:

  • To develop and present an efficient strategy for constructing lambda ZAP genomic expression libraries.
  • To provide methods for evaluating vector DNA status during library construction for troubleshooting.
  • To demonstrate the utility of the constructed libraries for gene identification and characterization.

Main Methods:

  • Utilized sonication for rapid generation of random chromosomal DNA fragments.

Related Experiment Videos

  • Employed restriction enzyme digestion for verification of vector DNA status.
  • Cloned DNA fragments into the Not I site of the lambda ZAP polylinker, avoiding DNA methylation.
  • Constructed genomic expression libraries for Synechococcus sp. PCC7942, Synechocystis sp. PCC6803, and Prochlorothrix hollandica.

    • Main Results:

    • The Not I cloning site eliminated the need for chromosomal DNA methylation, simplifying the process.
    • Sonication provided DNA fragments of optimal size for library construction.
    • Verified clones coding for Synechococcus sp. PCC7942 cytochrome f, unambiguously determining reading frames.
    • Successfully constructed functional genomic expression libraries for three cyanobacterial species.

    Conclusions:

    • The presented strategy offers an efficient and streamlined approach to lambda ZAP genomic expression library construction.
    • The method facilitates troubleshooting and enhances the ease of cloning and mapping of inserts.
    • The utility of these expression libraries and in vivo excision was confirmed through successful gene identification.