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Related Experiment Videos

Cloning, expression and sequence analysis of the SphI restriction-modification system

E P Guthrie1, T Quinton-Jager, L S Moran

  • 1New England Biolabs, Inc., Beverly, MA 01915, USA. guthrie@neb.com

Gene
|November 21, 1996
PubMed
Summary
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Researchers successfully cloned the SphI restriction endonuclease gene (sphIR) from Streptomyces phaeochromogenes into E. coli. This overcomes challenges in expressing active restriction-modification systems in foreign hosts.

Area of Science:

  • Molecular Biology
  • Microbiology
  • Genetics

Background:

  • The SphI restriction-modification (R-M) system from Streptomyces phaeochromogenes recognizes the 5'-GCATGC sequence.
  • Cloning R-M systems, particularly the endonuclease gene (ENase), into heterologous hosts like E. coli can be challenging due to potential toxicity.

Purpose of the Study:

  • To clone and express the SphI restriction endonuclease gene (sphIR) and its cognate methyltransferase gene (sphIM) in Escherichia coli.
  • To determine the nucleotide sequence of the SphI R-M system and analyze its features.
  • To understand the reasons for potential difficulties in expressing the SphI ENase gene in E. coli.

Main Methods:

  • Cloning of the SphI methyltransferase gene (sphIM) into E. coli using MTase selection.
  • A two-step cloning strategy involving PCR to isolate the 3' end of sphIR.

Related Experiment Videos

  • Reconstruction of the intact sphIR gene under an inducible promoter and introduction into E. coli co-harboring the NlaIII MTase gene (nlaIIIM).
  • DNA sequencing and comparative analysis of the SphI R-M system.

    • Main Results:

    • The SphI methyltransferase gene (sphIM) was successfully cloned, but the endonuclease gene (sphIR) was not initially obtained.
    • A two-step cloning approach enabled the isolation and reconstruction of the intact sphIR gene.
    • The complete SphI R-M system sequence was determined and analyzed, with comparisons made to other R-M systems.
    • The study investigated potential reasons for the differential expression of sphIR in E. coli.

    Conclusions:

    • The successful cloning of the SphI ENase gene (sphIR) in E. coli was achieved through a carefully designed two-step strategy.
    • The sequence analysis provided insights into the SphI R-M system and its potential expression characteristics in a heterologous host.
    • This work facilitates further studies on the SphI restriction-modification system and its components.