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Generation of Plasmid Vectors Expressing FLAG-tagged Proteins Under the Regulation of Human Elongation Factor-1α Promoter Using Gibson Assembly
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Assembling DNA fragments by USER fusion.

Narayana Annaluru1, Héloïse Muller, Sivaprakash Ramalingam

  • 1Pondicherry Biotech Private Limited, IT Park, Pondy Technopolis, Pillaichavady, Puducherry, India.

Methods in Molecular Biology (Clifton, N.J.)
|February 14, 2012
PubMed
Summary
This summary is machine-generated.

The uracil specific excision reaction (USER) fusion method enables rapid and efficient assembly of DNA fragments. This technique streamlines DNA fragment assembly both in vitro and in vivo using Escherichia coli.

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Biotechnology

Background:

  • DNA synthesis allows for the creation of large DNA fragments, but assembling smaller fragments into larger constructs remains challenging.
  • Efficient methods for DNA fragment assembly are crucial for synthetic biology and genetic engineering.

Purpose of the Study:

  • To describe a novel uracil specific excision reaction (USER)-mediated approach for rapid and efficient assembly of multiple DNA fragments.
  • To demonstrate the utility of USER fusion for both in vitro and in vivo DNA assembly using Escherichia coli.

Main Methods:

  • DNA fragments (building blocks, BBs) were amplified with uracil-containing primers.
  • USER enzyme treatment generated complementary 3' overhangs for ligation and amplification (in vitro).
  • USER treatment in the presence of a synthetic plasmid followed by transformation into E. coli enabled in vivo assembly.

Main Results:

  • Successfully assembled 0.75 kb DNA fragments into larger 3-kb segments using USER fusion in vitro.
  • Demonstrated efficient and correct reconstitution of recombinant plasmids containing target inserts via in vivo USER fusion in E. coli.
  • Rapidly assembled three target genes into a vector to create a new synthetic plasmid construct.

Conclusions:

  • USER fusion provides a rapid and efficient method for assembling multiple DNA fragments.
  • The USER fusion approach is versatile, applicable to both in vitro and in vivo DNA assembly strategies.
  • This method simplifies the construction of complex DNA molecules and synthetic gene constructs.