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. 1985 Jun;82(12):4202–4206. doi: 10.1073/pnas.82.12.4202

Two-codon insertion mutagenesis of plasmid genes by using single-stranded hexameric oligonucleotides.

F Barany
PMCID: PMC397964  PMID: 3889924

Abstract

An efficient method for introducing two codons into a cloned gene has been applied to studying functional regions of the pBR322-encoded tetracycline-resistance gene and beta-lactamase (ampicillin-resistance) gene. Single-stranded hexameric linkers are inserted into a preexisting cohesive end restriction site to create a new (six-base recognition) restriction site. Insertion mutations are enriched by using biochemical selection or are selected by using a kanamycin-resistance cassette (biological selection). Phenotypes of insertion mutations isolated in the tetracycline-resistance gene support the hypothesis that it is comprised of two domains connected by a central hinge. Mutations in the beta-lactamase gene are temperature sensitive and demonstrate altered sensitivity to various beta-lactams and inhibitors.

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Selected References

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