Abstract
A genomic library of meningococcal DNA from a clinical isolate of Neisseria meningitidis was constructed in the expression vector lambda gt11. Outer membrane complex was prepared from the same strain and used to immunize rabbits to raise polyclonal anti-outer membrane complex serum. The amplified library was probed with this polyclonal serum, and seven expressing recombinants were isolated; further investigations indicated these to be identical. The expressed meningococcal gene in these recombinants was fused to vector beta-galactosidase and shown to encode epitopes present on the 42-kilodalton class 1 outer membrane protein. Estimation of the size of the recombinant fusion protein suggests that up to 40 kilodaltons of protein-coding sequence is present. The lambda gt11 recombinant contains a 3.4-kilobase DNA insert, which has been recloned into a plasmid and characterized by restriction endonuclease analysis. A restriction fragment from the insert, representing the protein-coding region hybridizes to a single 2.2-kilobase XbaI fragment from the homologous strain and to similar-sized XbaI fragments in other strains of meningococci, expressing antigenically distinct class 1 proteins.
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Selected References
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