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Expression of Double Vitreoscilla Hemoglobin Enhances Growth and Alters Ribosome and tRNA Levels in Escherichia coli
Author(s) -
Roos Viktoria,
Andersson Charlotte I. J.,
Arfvidsson Cecilia,
Wahlund KarlGustav,
Bülow Leif
Publication year - 2002
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1021/bp020005v
Subject(s) - escherichia coli , transfer rna , hemoglobin , biology , ribosome , escherichia , microbiology and biotechnology , rna , biochemistry , gene
In several organisms, expression of a gene encoding dimeric hemoglobin (VHb) from the obligate aerobic bacterium Vitreoscilla stercoraria has been shown to increase microaerobic cell growth and enhance oxygen‐dependent cell metabolism. In an attempt to further improve these effects of VHb, a gene encoding two vhb genes connected by a short linker of six base pairs was constructed and expressed in Escherichia coli (double VHb). Escherichia coli cells expressing double VHb reached a cell density 19% higher than that of cells expressing native VHb. The protein production per cell remained constant since the increase in cell growth was accompanied by an increase in protein content by 16%. Investigation of ribosome and tRNA content revealed that cells expressing double VHb reached their maximal capacity of protein synthesis later during cultivation than cells expressing native VHb, and furthermore they reached considerably higher levels of ribosome and tRNA compared to that of the VHb‐expressing cells.