Immobilization and purification of enzymes with staphylococcal protein A gene fusion vectors (original) (raw)

Abstract

Two improved plasmid vectors, containing the gene coding for staphylococcal protein A and adapted for gene fusions, have been constructed. These vectors allow fusion of any gene to the protein A moiety, giving fusion proteins which can be purified, in a one-step procedure by IgG affinity chromatography. One vector, pRIT2, is designed for temperature-inducible expression of intracellular fusion proteins in Escherichia coli and the other pRIT5, is a shuttle vector designed for secretion. The latter gives a periplasmatic fusion protein in E. coli and an extracellular protein in Gram-positive hosts such as Staphylococcus aureus. The usefulness of these vectors is exemplified by fusion of the protein A gene and the E. coli genes encoding the enzymes beta-galactosidase and alkaline phosphatase. High amounts of intact fusion protein are produced which can be immobilized on IgG-Sepharose in high yield (95-100%) without loss of enzymatic activity. Efficient secretion in both E. coli and S. aureus, was obtained for the alkaline phosphatase hybrid, in contrast to beta-galactosidase which was only expressed efficiently using the intracellular system. More than 80% of the protein A alkaline-phosphatase hybrid protein can be eluted from IgG affinity columns without loss of enzymatic activity.

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