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A genomic library of Pseudomonas aeruginosa DNA was screened with a monoclonal antibody (MAb 2528) specific for the P. aeruginosa 60-kDa heat shock protein. A positive clone, pAS-1, was isolated. The gene coding for P. aeruginosa chaperonin (hsp60) was localized to a 2-kb EcoRI fragment subcloned in pAS-2. A sequence analysis of pAS-2 and parts of pAS-1 identified two open reading frames that encoded proteins with calculated molecular masses of 10 and 57 kDa. In amino acid sequence comparison studies the sequences of these proteins, which were designated GroES and GroEL, exhibited up to 78% homology with known prokaryotic sequences of 10- and 60-kDa heat shock proteins (hsp10 and hsp60). In order to map the epitope recognized by MAb 2528, a series of GroEL nested carboxy-terminal deletion clones were tested with MAb 2528. We identified the clone with the shortest insertion that was still recognized by MAb 2528 and the clone with the largest insertion that was not recognized by MAb 2528. The 3' ends of the insertions were determined by sequencing and were found to delimit a region that encoded 25 amino acid residues. Synthetic oligonucleotides that coded for peptides possibly resembling the epitope within this region were ligated into expression vector pGEX-3X, and fusion proteins expressed by these clones were tested for reactivity with MAb 2528. By using this method we determined that the decapeptide QADIEARVLQ (positions 339 to 348 on GroEL) was responsible for the binding of P. aeruginosa-specific MAb 2528.

infection and immunity

Cloning and sequencing of the genes coding for the 10- and 60-kDa heat shock proteins from Pseudomonas aeruginosa and mapping of a species-specific epitope