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Journal of Bacteriology logoLink to Journal of Bacteriology
. 1985 May;162(2):777–783. doi: 10.1128/jb.162.2.777-783.1985

Phasmid vectors for identification of genes by complementation of Escherichia coli mutants.

S J Elledge, G C Walker
PMCID: PMC218919  PMID: 2985547

Abstract

A bacteriophage lambda cloning vector was designed to facilitate the isolation of genes from procaryotic organisms by complementation of Escherichia coli mutants. This vector, lambda SE4, was constructed by attaching a very-low-copy-number replication system (from the plasmid NR1) and a spectinomycin resistance gene to the left arm of lambda 1059 (Karn et al., Proc. Natl. Acad. Sci. U.S.A. 77:5172-5176, 1980). This phasmid cloning vector is capable of growing lytically as a phage in a nonimmune host or lysogenically as a phasmid in an immune host. This phasmid utilizes the Spi- selection for insertions of DNA into the vector and has the ability to accept 2- to 19-kilobase Sau3A1, BamHI, BglII, BclI, or XhoII fragments; recombinants lysogenize immune hosts as single-copy-number selectable plasmids at 100% frequency. An E. coli library was constructed by using the initial vector lambda SE4, and clones of a number of representative genes were identified. A typical clone, lambda ant+, was shown to be readily mutagenized by a mini-Tn10 transposon. A general method for transferring cloned DNA segments onto bacteriophage lambda was developed. The method involves the use of in vivo recombination with a selection and was used to construct two derivatives of lambda SE4. Possible uses of these vectors and of the method for transferring cloned DNA onto phage lambda are discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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