A new lambda RES vector with a built-in Tn1721-encoded excision system.
A new lambda replacement vector for construction of genomic libraries was developed which allows the excision of cloned fragments by site-specific recombination from the lambda DNA and conversion into autonomously replicating plasmids. The vector system, derived from lambda EMBL4, is called lambda RES. It contains two recognition sites for site-specific recombination from Tn1721 on both sides of the replacement fragment of lambda EMBL4. Additionally, on one side, there is a plasmid replication origin from Rtsl with a kanamycin-resistance (KmR) marker. DNA fragments in the range of 8-14 kb may be inserted between BamHI or Sall sites in the lambda vector. Efficient excision and conversion of plaque-forming units into KmR colonies are obtained by infection of Escherichia coli strains harbouring Tn1739tnpR on a F' plasmid. Tn1739tnpR is a derivative of Tn1721 with a chloramphenicol-resistance-encoding gene (CmR), the lambda cI repressor gene, and a further copy of the resolvase-encoding tnpR gene under control of the tac promoter.
Institut für Industrielle Genetik, Universität Stuttgart, Germany.
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Altenbuchner
D010582:Bacteriophage lambda / Q000235:genetics*; D003001:Cloning, Molecular; D004251:DNA Transposable Elements; D004274:DNA, Recombinant; D015723:Gene Library; D005816:Genetic Complementation Test; D005819:Genetic Markers; D005822:Genetic Vectors; D007613:Kanamycin Resistance / Q000235:genetics; D010957:Plasmids; D015183:Restriction Mapping
D004251:DNA Transposable Elements; D004274:DNA, Recombinant; D005819:Genetic Markers