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• W2129335818 abstract "ABSTRACT Expression of the vhb gene encoding hemoglobin from Vitreoscilla sp. (VHb) in several organisms has been shown to improve microaerobic cell growth and enhance oxygen-dependent product formation. The amino-terminal hemoglobin domain of the flavohemoprotein (FHP) of the gram-negative hydrogen-oxidizing bacterium Alcaligenes eutrophus has 51% sequence homology with VHb. However, like other flavohemoglobins and unlike VHb, FHP possesses a second (carboxy-terminal) domain with NAD(P)H and flavin adenine dinucleotide (FAD) reductase activities. To examine whether the carboxy-terminal redox-active site of flavohemoproteins can be used to improve the positive effects of VHb in microaerobic Escherichia coli cells, we fused sequences encoding NAD(P)H, FAD, or NAD(P)H-FAD reductase activities of A. eutrophus in frame after the vhb gene. Similarly, the gene for FHP was modified, and expression cassettes encoding amino-terminal hemoglobin (FHPg), FHPg-FAD, FHPg-NAD, or FHP activities were constructed. Biochemically active heme proteins were produced from all of these constructions in Escherichia coli , as indicated by their ability to scavenge carbon monoxide. The presence of FHP or of VHb-FAD-NAD reductase increased the final cell density of transformed wild-type E. coli cells approximately 50 and 75%, respectively, for hypoxic fed-batch culture relative to the control synthesizing VHb. Approximately the same final optical densities were achieved with the E. coli strains expressing FHPg and VHb. The presence of VHb-FAD or FHPg-FAD increased the final cell density slightly relative to the VHb-expressing control under the same cultivation conditions. The expression of VHb-NAD or FHPg-NAD fusion proteins reduced the final cell densities approximately 20% relative to the VHb-expressing control. The VHb-FAD-NAD reductase-expressing strain was also able to synthesize 2.3-fold more recombinant β-lactamase relative to the VHb-expressing control." @default.
• W2129335818 created "2016-06-24" @default.
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• W2129335818 date "2000-01-01" @default.
• W2129335818 modified "2023-10-16" @default.
• W2129335818 title "Expression of <i>Alcaligenes eutrophus</i> Flavohemoprotein and Engineered <i>Vitreoscilla</i> Hemoglobin-Reductase Fusion Protein for Improved Hypoxic Growth of <i>Escherichia coli</i>" @default.
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• W2129335818 doi "https://doi.org/10.1128/aem.66.1.98-104.2000" @default.
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