Expression of genes for subunits of plant‐type RuBisCO from Chromatium and production of the enzymically active molecule in Escherichia coli

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Abstract
A DNA fragment containing genes for both large (A) and small (B) subunits ofribulose‐1,5‐bisphosphate carboxylase/oxygenase (RuBisCO) from a photosynthetic bacterium Chromatium vinosum was ligated with vectors for expressing unfused proteins and introduced into cells of Escherichia coli. The expressers of RuBisCO were screened on agar plates using the specific antibody raised against the native enzyme from Chromatium. The production of both subunits A and B in the expressers was demonstrated by an immunoblotting experiment. The amount of RuBisCO produced in the E. coli cells was as high as 15% of the total soluble protein after induction with isopropyl‐β‐D‐thiogalactoside. The specific activity of enzyme molecules produced in E. coli was nearly the same as that of the original Chromatium enzyme. On gel filtration high‐performance liquid chromatography the two enzymes showed identical elution behavior, strongly indicating their similar quaternary structures.