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Bacterial RNA Polymerase00:43

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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Production of Reverse Transcriptase and DNA Polymerase in Bacterial Expression Systems.

Kristína Hriňová1, Johana Dlapová1, Bohuš Kubala2

  • 1Department of Molecular Biology, Faculty of Natural Sciences, Comenius University in Bratislava, 84215 Bratislava, Slovakia.

Bioengineering (Basel, Switzerland)
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Summary

Vibrio natriegens is a promising host for producing recombinant DNA amplification and reverse transcription enzymes, offering a suitable alternative to Escherichia coli for enzyme production. This study demonstrates its potential for generating soluble Taq DNA polymerase and mutant M-MLV reverse transcriptase.

Keywords:
DNA polymeraseEscherichia coliVibrio natriegensextracellular productionprotein productionreverse transcriptase

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Microbial Engineering

Background:

  • DNA amplification and reverse transcription enzymes are critical for diagnostics and research.
  • High-level production of these enzymes is essential for their widespread application.
  • Escherichia coli is a common host, but challenges exist in recombinant protein production.

Purpose of the Study:

  • To evaluate Vibrio natriegens as an expression host for mutant Taq DNA polymerase and mutant M-MLV reverse transcriptase.
  • To compare enzyme production levels and solubility in V. natriegens versus Escherichia coli.
  • To investigate extracellular enzyme production in V. natriegens.

Main Methods:

  • Gene expression of mutant Taq DNA polymerase and M-MLV reverse transcriptase in V. natriegens and E. coli.
  • Optimization of expression conditions.
  • Analysis of intracellular and extracellular protein production using percentage of total cell proteins (TCPs).
  • Assessment of protein solubility.

Main Results:

  • Intracellular M-MLV production: 11% TCPs in V. natriegens vs. 16% TCPs in E. coli; soluble protein: 11% in V. natriegens vs. 22% in E. coli.
  • Intracellular Taq pol production: 30% TCPs in V. natriegens vs. 26% TCPs in E. coli; soluble protein: 23% in V. natriegens vs. almost non-soluble in E. coli.
  • Substantial extracellular Taq pol production was detected in V. natriegens.

Conclusions:

  • Vibrio natriegens is a viable alternative host for recombinant enzyme production.
  • V. natriegens demonstrates potential for high-level soluble production of Taq DNA polymerase and M-MLV reverse transcriptase.
  • Extracellular production of Taq pol in V. natriegens offers additional production possibilities.