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pubmed-article:11214237pubmed:abstractTextNon-encapsulated or non-typable Haemophilus influenzae (NTHi) is a major cause of middle ear infections in young children. HtrA has been identified as a vaccine candidate antigen from NTHi; therefore physicochemical characterization of this antigen is important for vaccine development. Recombinant NTHi HtrA has been expressed in E. coli and shown to have serine protease activity. Several mutant, recombinant HtrA proteins were expressed and purified to obtain suitable vaccine antigens lacking protease activity. Two mutants with alterations at the putative active site His91 and Ser197, designated H91A and S197A were examined by circular dichroic spectropolarimetry (CD) to evaluate secondary structure. The S197A mutant had a more random secondary structure compared to wild-type rHtrA or H91A. It is likely that improper folding of S197A accounts for its lack of immunoprotective properties in a chinchilla model of otitis media.lld:pubmed
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pubmed-article:11214237pubmed:authorpubmed-author:YangY PYPlld:pubmed
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pubmed-article:11214237pubmed:pagination201-4lld:pubmed
pubmed-article:11214237pubmed:dateRevised2003-11-14lld:pubmed
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pubmed-article:11214237pubmed:articleTitleProperties of recombinant HtrA: an otitis media vaccine candidate antigen from non-typeable Haemophilus influenzae.lld:pubmed
pubmed-article:11214237pubmed:affiliationAventis Pasteur, Toronto, Ontario, Canada.lld:pubmed
pubmed-article:11214237pubmed:publicationTypeJournal Articlelld:pubmed
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