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Updated: Jul 11, 2025

Efficient Mammalian Cell Expression and Single-step Purification of Extracellular Glycoproteins for Crystallization

Efficient Mammalian Cell Expression and Single-step Purification of Extracellular Glycoproteins for Crystallization

Published on: December 23, 2015

Tips for efficiently maintaining pET expression plasmids.

Diana Khananisho¹, Alister J Cumming¹, Daria Kulakova¹

¹Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden.

Current Genetics

|November 8, 2023

Summary

This summary is machine-generated.

Efficiently maintain pET plasmids for recombinant protein production by selecting the right Escherichia coli host strain and antibiotic resistance cassette. Optimize induction times to prevent plasmid loss, especially with high T7 RNA polymerase strains.

Keywords:

Aminoglycoside-3’-phosphotransferase Bacterial cell factory Plasmid instability Plasmid maintenance Plasmid stability Tn3 Tn903 pET expression plasmid ß-Lactamase

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Area of Science:

Molecular Biology
Biotechnology
Microbiology

Background:

pET expression plasmids are crucial for recombinant protein production in Escherichia coli.
Plasmid maintenance relies on antibiotic resistance markers, typically ß-lactamase (Tn3.1) or aminoglycoside phosphotransferase (Tn903.1).

Purpose of the Study:

To investigate the efficiency of pET plasmid maintenance using Tn3.1 and Tn903.1 genetic fragments.
To identify factors influencing plasmid stability during long-term recombinant protein expression.

Main Methods:

Comparative analysis of pET plasmid maintenance in different Escherichia coli strains (e.g., C41(DE3), BL21(DE3)).
Evaluation of plasmid stability under varying induction times (short vs. long) and antibiotic selection pressures.
Assessment of Tn3.1 and Tn903.1 cassette performance.

Main Results:

pET plasmids are maintained efficiently with both resistance markers under short induction times.
Longer induction times (20 h) reveal strain-dependent plasmid maintenance.
Plasmid stability is influenced by the host strain and the specific antibiotic resistance cassette used.

Conclusions:

Strain selection (e.g., C41(DE3) with low T7 RNA polymerase) ensures efficient plasmid maintenance over long induction periods.
For high T7 RNA polymerase strains (e.g., BL21(DE3)), short induction or Tn903.1 cassettes with kanamycin selection are recommended for stable pET plasmid maintenance.