Abstract：
:The severe and fatal human disease, tularemia, results from infection with the Gram-negative pathogen Francisella tularensis. Identification of surface outer membrane proteins, specifically lipoproteins, has been of interest for vaccine development and understanding the initiation of disease. We sought to identify Francisella live vaccine strain lipoproteins that could be a component of a subunit vaccine and have adjuvant properties as TLR2 agonists. We have identified a membrane lipoprotein of Francisella LVS isolated by sarkosyl extraction and gel filtration chromatography that is recognized by sera from LVS-vaccinated individuals and tularemia patients, indicating its potential diagnostic value. Sequencing of the protein by mass spectrometry indicated that it encodes the FTL_0645 open reading frame of F. holarctica LVS, which is 100% identical/homologous to FTT1416c of F. tularensis Schu S4. The predicted 137 amino acid lipoprotein encoded by FTL_0645 ORF, was expressed in Escherichia coli, purified, and demonstrated to be a lipoprotein. This recombinant lipoprotein, named Flpp3, was able to activate TLR2 and induce an immunogenic response in mice, suggesting that the E. coli-expressed Flpp3 is palmitoylated and closely resembles the native protein in structure and immunogenicity. Taken together, these data suggest that Flpp3 could be a candidate for inclusion in a F. tularensis vaccine.
journal_name
Microbiol Resjournal_title
Microbiological researchauthors
Parra MC,Shaffer SA,Hajjar AM,Gallis BM,Hager A,Goodlett DR,Guina T,Miller S,Collins CMdoi
10.1016/j.micres.2009.11.004subject
Has Abstractpub_date
2010-09-20 00:00:00pages
531-45issue
7eissn
0944-5013issn
1618-0623pii
S0944-5013(09)00107-4journal_volume
165pub_type
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