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. 1990 Apr;87(8):3166–3169. doi: 10.1073/pnas.87.8.3166

Improved genetic selection for screening bacteriophage libraries by homologous recombination in vivo.

D M Kurnit 1, B Seed 1
PMCID: PMC53855  PMID: 2183225

Abstract

Three major difficulties have hindered the general application of in vivo recombination techniques to library screening: (i) the original selection could not be applied to libraries prepared in phage vectors lacking amber mutations, (ii) nonirradiated packaging extracts gave high backgrounds even when amber mutated vectors were used, and (iii) most red- vectors lacked rap, a recently discovered phage gene promoting phage-plasmid recombination. Here we describe a selection scheme for phage bearing suppressor tRNA plasmids, which relies upon an Escherichia coli host bearing an amber mutation in the dnaB gene. The selection is tight enough to allow library screening by recombination, is applicable to almost every phage vector in common use, and overcomes the background associated with nonirradiated packaging extracts. We also describe an ancillary plasmid that supplies the rap gene function in trans, permitting the recombination level to be raised fruitfully in phage libraries lacking endogenous rap. Finally, we demonstrate simple procedures for preparing and detecting phages that have lost integrated suppressor tRNA plasmids by homologous recombination.

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Selected References

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