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Global transcriptome response of recombinant Escherichia coli to heat-shock and dual heat-shock recombinant protein induction

  • Sarah W. HarcumEmail author
  • Fu’ad T. Haddadin
Original Paper

Abstract

Recombinant Escherichia coli cultures are used to manufacture numerous therapeutic proteins and industrial enzymes, where many of these processes use elevated temperatures to induce recombinant protein production. The heat-shock response in wild-type E. coli has been well studied. In this study, the transcriptome profiles of recombinant E. coli subjected to a heat-shock and to a dual heat-shock recombinant protein induction were examined. Most classical heat-shock protein genes were identified as regulated in both conditions. The major transcriptome differences between the recombinant and reported wild-type cultures were heavily populated by hypothetical and putative genes, which indicates recombinant cultures utilize many unique genes to respond to a heat-shock. Comparison of the dual stressed culture data with literature recombinant protein induced culture data revealed numerous differences. The dual stressed response encompassed three major response patterns: induced-like, in-between, and greater than either individual stress response. Also, there were no genes that only responded to the dual stress. The most interesting difference between the dual stressed and induced cultures was the amino acid-tRNA gene levels. The amino acid-tRNA genes were elevated for the dual cultures compared to the induced cultures. Since, tRNAs facilitate protein synthesis via translation, this observed increase in amino acid-tRNA transcriptome levels, in concert with elevated heat-shock chaperones, might account for improved productivities often observed for thermo-inducible systems. Most importantly, the response of the recombinant cultures to a heat-shock was more profound than wild-type cultures, and further, the response to recombinant protein induction was not a simple additive response of the individual stresses.

Keywords

Heat-shock response Gene regulation Chloramphenicol acetyltransferase Transcriptome DNA microarrays tRNA Chaperones 

Notes

Acknowledgment

This material is based upon work supported by the National Science Foundation under Grant No. 0303782.

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Copyright information

© Society for Industrial Microbiology 2006

Authors and Affiliations

  1. 1.Department of BioengineeringClemson UniversityClemsonUSA
  2. 2.Department of Chemical and Biomolecular EngineeringClemson UniversityClemsonUSA

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