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pubmed-article:8759848pubmed:abstractTextStreptococcus pneumoniae is believed to produce more than one form of neuraminidase, but there has been uncertainty as to whether this is due to posttranslational modification of a single gene product or the existence of more than one neuraminidase-encoding gene. Only one stable pneumococcal neuraminidase gene (designated nanA) has been described. In the present study, we isolated and characterized a second neuraminidase gene (designated nanB), which is located close to nanA on the pneumococcal chromosome (approximately 4.5kb downstream). nanB was located on an operon separate from that of nanA, which includes at least five other open reading frames. NanB has a predicted size of 74.5 kDa after cleavage of a 29-amino-acid signal peptide. There was negligible amino acid homology between NanA and NanB, but NanB did exhibit limited homology with the sialidase of Clostridium septicum. NanB was purified from recombinant Escherichia coli and found to have a pH optimum of 4.5, compared with 6.5 to 7.0 for NanA. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis suggested that NanB has a molecular size of approximately 65 kDa. The discrepancy between this estimate and the size predicted from the nucleotide sequence is most likely a consequence of C-terminal processing or anomalous electrophoretic behavior.lld:pubmed
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pubmed-article:8759848pubmed:authorpubmed-author:BerryA MAMlld:pubmed
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pubmed-article:8759848pubmed:articleTitleCloning and characterization of nanB, a second Streptococcus pneumoniae neuraminidase gene, and purification of the NanB enzyme from recombinant Escherichia coli.lld:pubmed
pubmed-article:8759848pubmed:affiliationMolecular Microbiology Unit, Women's and Children's Hospital, North Adelaide, South Australia, Australia.lld:pubmed
pubmed-article:8759848pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8759848pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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