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Pap pili as a vector system for surface exposition of an immunoglobulin G-binding domain of protein A of Staphylococcus aureus in Escherichia coli.

Laboratory of Molecular Biology, Gent University, Belgium.

ABSTRACT

Fusion genes between papA, the gene coding for the major Pap pilus subunit, and fragments coding for an immunoglobulin G-binding domain of the Staphylococcus aureus protein A were constructed in such a way that the spa fragments were inserted following either codon 7 or 68 of the coding sequence for the mature portion of PapA. Peptides in the area of amino acids 7 and 68 of PapA are localized at the external side of the pilus. A set of pL expression plasmids containing papA and derivatives suitable for insertion were constructed. A papA gene carrying a spa insert following codon 68 was cloned back into the pap operon. The presence of this altered operon in a bacterial strain allowed the detection of immunoglobulin G-binding activity at the surfaces of the bacterial cells.

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