Journal of Microbiology

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The Identification of Six Novel Proteins with Fibronectin or Collagen Type І Binding Activity from Streptococcus suis Serotype 2: Hui Zhang , Junxi Zheng , Li Yi , Yue Li , Zhe Ma , Hongjie Fan , Chengping Lu; J. Microbiol. 2014;52(11):963-969. Published online October 31, 2014; DOI: https://doi.org/10.1007/s12275-014-4311-x

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Streptococcus suis, a major swine pathogen, is an emerging zoonotic agent that causes meningitis and septic shock. Bacterial cell wall and secreted proteins are often involved in interactions with extracellular matrix proteins (ECMs), which play important roles in the initial steps of pathogenesis. In this study, 2D SDS-PAGE, western blotting-based binding affinity measurements, and microtiter plate binding assays were used to identify cell wall and secreted proteins from S. suis that interact with fibronectin and collagen type І. We identified six proteins from S. suis, including three proteins (translation elongation factor G, oligopeptide-binding protein OppA precursor, and phosphoglycerate mutase) that show both fibronectin and collagen type І binding activity. To the best of our knowledge, these three newly identified proteins had no previously reported fibronectin or collagen type І binding activity. Overall, the aim in this study was to identify proteins with ECM binding activity from S. suis and it represents the first report of six new proteins from S. suis that interact with fibronectin or collagen type І.

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Characterization of Streptococcus pneumoniae N-Acetylglucosamine-6-Phosphate Deacetylase as a Novel Diagnostic Marker: Chi-Won Choi , Hee-Young An , Yong Ju Lee , Yeol Gyun Lee , Sung Ho Yun , Edmond Changkyun Park , Yeonhee Hong , Gun-Hwa Kim , Jae-Eun Park , Sun Jong Baek , Hyun Sik Kim , Seung Il Kim; J. Microbiol. 2013;51(5):659-664. Published online October 31, 2013; DOI: https://doi.org/10.1007/s12275-013-3451-8

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Abstract

The identification of novel diagnostic markers of pathogenic bacteria is essential for improving the accuracy of diagnoses and for developing targeted vaccines. Streptococcus pneumoniae is a significant human pathogenic bacterium that causes pneumonia. N-acetylglucosamine-6-phosphate deacetylase (NagA) was identified in a protein mixture secreted by S. pneumoniae and its strong immunogenicity was confirmed in an immuno-proteomic assay against the anti-serum of the secreted protein mixture. In this study, recombinant S. pneumoniae NagA protein was expressed and purified to analyze its protein characteristics, immunospecificity, and immunogenicity, thereby facilitating its evaluation as a novel diagnostic marker for S. pneumoniae. Mass spectrometry analysis showed that S. pneumoniae NagA contains four internal disulfide bonds and that it does not undergo posttranslational modification. S. pneumoniae NagA antibodies successfully detected NagA from different S. pneumoniae strains, whereas NagA from other pathogenic bacteria species was not detected. In addition, mice infected with S. pneumoniae generated NagA antibodies in an effective manner. These results suggest that NagA has potential as a novel diagnostic marker for S. pneumoniae because of its high immunogenicity and immunospecificity.

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