High-level expression of a heterologous gene in Escherichia coli in response to carbon-nitrogen source and C/N ratio in a batch bioreactor

Sanjoy K. Bhattacharya, Ashok K. Dubey

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Overexpression of the target gene in a recombinant strain of Escherichia coli has been analyzed in view of changes in the carbon-nitrogen source and as a function of C/N ratio. The rate of target gene expression varied over a range of 200%, and the yield coefficient for the target gene product changed over 400% with change in carbon source at 10 g L-1 in M9 medium. With variation in nitrogen source, however, only marginal changes (10-15%) occurred in these parameters of overexpression. Higher concentration, for example 2.5 g L-1, of any nitrogen source adversely affected heterologous expression as rate of target gene expression declined in the range 35%-50% and the yield coefficient of foreign protein decreased between 45% and 60%. A C/N ratio of 15 was found to be optimum for both parameters for overexpression and host specific parameters such as specific growth rate and observed yield coefficient for cellular growth. An analysis with respect to temperature and pH revealed that host and expression parameters were quite susceptible to changes in these factors.

Original languageEnglish (US)
Pages (from-to)151-155
Number of pages5
JournalBiotechnology Progress
Volume13
Issue number2
DOIs
StatePublished - Mar 1 1997
Externally publishedYes

ASJC Scopus subject areas

  • Biotechnology

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