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The genes encoding transferrin-binding proteins (TBPs) 1 and 2 of Neisseria meningitidis and N. gonorrhoeae were used as model loci in a novel method of cloning (twin N-terminal polymerase chain reaction; TNT-PCR) involving amplification between the 5' ends of two genes. Primers were based on N-terminal amino-acid sequences. A 2.1-kb product amplified from N. meningitidis strain SD (B15 P1.16) was cloned into a plasmid vector and partially sequenced. Translated sequence immediately downstream of the primer at both ends of this product correlated to the additional known N-terminal amino acids of TBP-1 and 2. The protein encoded by the cloned sequence reacted with TBP-2-specific antiserum. The size of products generated in TNT-PCR correlated exactly with the different sized TBP-2 produced by 10 strains of the Neisseria spp. examined, indicating successful cloning of the gene for TBP-2 and showing it to be adjacent to and preceding TBP-1 on the chromosome for both N. meningitidis and N. gonorrhoeae.

Cloning and partial sequence of transferrin-binding protein 2 of Neisseria meningitidis using a novel method: Twin N-terminal PCR