Folia Microbiologica

, Volume 39, Issue 4, pp 255–260 | Cite as

Direct selection shuttle plasmid vector, pPW264, used for cloning the α-amylase gene ofSchwanniomyces occidentalis

  • F. P⫲ta
  • I. Šmardová
  • G. Varga
  • B. Janderová


We constructed a novel cloning system with positive selection for inserted fragments. The gene for tetracycline resistance (tet R) originally used in plasmid pTR262 was replaced with the gene for chloramphenicol acetyltransferase (cat) and terminator sequences were introduced downstream of thecat gene. The terminator sequences stop transcription originating on strongP R promoter that would otherwise proceed through the region of replication origin and interfere with plasmid replication. Thus the copy number of recombinant plasmid molecules is stabilized. The cloning system has been constructed in a new YEp type shuttle vector, pPW264. The 8.1 kb-vector carries two unique cloning sites,Bg/II andHindIII. The maintenance of the vector and selection in yeast is ensured byURA 3 Saccharomyces cerevisiae gene. The vector was employed in cloning of the gene for α-amylase fromSchwanniomyces occidentalis.


Shuttle Vector Tetracycline Resistance Cloning System Plasmid Replication Chloramphenicol Acetyltransferase 
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Copyright information

© Folia Microbiologica 1994

Authors and Affiliations

  • F. P⫲ta
    • 1
  • I. Šmardová
    • 1
  • G. Varga
    • 1
  • B. Janderová
    • 1
  1. 1.Department of Genetics and Microbiology, Faculty of ScienceCharles UniversityPrague 2Czech Republic

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