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Related Experiment Videos

Construction of a multiframe vector to express coding sequences in Escherichia coli.

V Domínguez-Martínez1, G Guarneros-Peña, M Segura-Nieto

  • 1Facultad de Ciencias Biológicas e Instituto, Salud Pública, Universidad Veracruzana, Xalapa, Ver., México.

Canadian Journal of Microbiology
|March 31, 2004
PubMed
Summary

Researchers developed a new expression vector, pMFV7, simplifying foreign DNA cloning and analysis in Escherichia coli. This vector enables expression of cloned coding sequences regardless of their reading frame, streamlining molecular biology workflows.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Traditional cloning for coding sequence analysis in Escherichia coli often requires multiple vectors.
  • Simplifying the cloning process is crucial for efficient molecular biology research.

Purpose of the Study:

  • To develop a single expression vector, pMFV7, that can accommodate foreign DNA fragments in any reading frame.
  • To assess the feasibility of using pMFV7 for gene expression irrespective of the cloned sequence's reading frame.

Main Methods:

  • Construction of the pMFV7 expression vector with three ATG start codons in different frames downstream of a Shine-Dalgarno sequence.
  • Cloning of lacZ gene fragments into pMFV7 in all possible reading frames.
  • Sequence analysis of N-terminus regions and measurement of beta-galactosidase activity.

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Main Results:

  • Sequence analysis confirmed that ribosomes initiate translation at each of the three start codons in pMFV7.
  • Expression of cloned DNA fragments was achieved regardless of their reading frame.
  • Beta-galactosidase activity levels were observed to be influenced by the N-terminus of translation products in one instance.

Conclusions:

  • The pMFV7 expression vector is effective for expressing coding sequences in Escherichia coli, regardless of their reading frame.
  • pMFV7 simplifies the cloning process, reducing the need for multiple vectors.
  • This vector offers a versatile tool for molecular cloning and gene expression studies.