Comparative Production of Green Fluorescent Protein Under Co-expression of Bacterial Hemoglobin in Escherichia coli W3110 Using Different Culture Scales

Production of green fluorescent protein (GFP) as a model foreign protein using different culture scales under co-expression of Vitreoscilla hemoglobin (VHb) in the industrial Escherichia coli strain W3110 (a K12 derivative), was examined. It was found that the VHb co-expressing W3110, exhibited an exceptional and sustained production ability during cell cultures using different scales, while the VHb non-expressing strain showed variable production levels. This high and sustained production ability indicates that the VHb co-expressing E. coli W3110, could be successfully employed for practical large-scale production cultures without the need for serious consideration of scale-up problems.