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pubmed-article:11092845pubmed:abstractTextPasteurella multocida is a mucosal pathogen that colonizes the respiratory system of susceptible hosts. Most isolates of P. multocida produce sialidase activity, which may contribute to colonization of the respiratory tract or the production of lesions in an active infection. We have cloned and sequenced a sialidase gene, nanH, from a fowl cholera isolate of P. multocida. Sequence analysis of NanH revealed that it exhibited significant amino acid sequence homology with many microbial sialidases. Insertional inactivation of nanH resulted in a mutant strain that was not deficient in sialidase production. However, this mutant exhibited reduced enzyme activity and growth rate on 2-3' sialyl lactose compared to the wild type. Subsequently, we demonstrated the presence of two sialidases by cloning another sialidase gene that differed from nanH in DNA sequence and substrate specificity. NanB demonstrated activity on both 2-3' and 2-6' sialyl lactose, while NanH demonstrated activity only on 2-3' sialyl lactose. Neither enzyme liberated sialic acid from colominic acid (2-8' sialyl lactose). Recombinant E. coli containing the sialidase genes were able to utilize several sialoconjugants when they were provided as sole carbon sources in minimal medium. These data suggest that sialidases have a nutritional function and may contribute to the ability of P. multocida to colonize and persist on vertebrate mucosal surfaces.lld:pubmed
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pubmed-article:11092845pubmed:dateRevised2010-9-14lld:pubmed
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pubmed-article:11092845pubmed:articleTitleCloning and characterization of sialidases with 2-6' and 2-3' sialyl lactose specificity from Pasteurella multocida.lld:pubmed
pubmed-article:11092845pubmed:affiliationDepartment of Medical Microbiology and Parasitology, University of Georgia, Athens, Georgia 30602, USA.lld:pubmed
pubmed-article:11092845pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11092845pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:11092845pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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