Related Experiment Video
Updated: May 6, 2026
Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
Published on: October 2, 2017
Characterization of Streptococcus pneumoniae N-acetylglucosamine-6-phosphate deacetylase as a novel diagnostic marker
Chi-Won Choi1, Hee-Young An, Yong Ju Lee
1Division of Life Science, Korea Basic Science Institute (KBSI), Daejeon 305-806, Republic of Korea.
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 post-translational 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.
Insights
Researchers identified a novel diagnostic marker, N-acetylglucosamine-6-phosphate deacetylase (NagA), for Streptococcus pneumoniae. This highly immunogenic and specific protein shows promise for improving pneumonia diagnosis and vaccine development.
Area of Science:
- Microbiology and Immunology
- Bacterial Pathogenesis
- Vaccine Development
Background:
- Accurate diagnosis of pathogenic bacteria like Streptococcus pneumoniae is crucial for effective treatment and vaccine design.
- Streptococcus pneumoniae is a major cause of pneumonia, necessitating improved diagnostic tools.
Purpose of the Study:
- To evaluate N-acetylglucosamine-6-phosphate deacetylase (NagA) from Streptococcus pneumoniae as a potential diagnostic marker.
- To characterize the protein's properties, including its specificity and immunogenicity.
Main Methods:
- Recombinant Streptococcus pneumoniae NagA protein was expressed and purified.
- Mass spectrometry was used to analyze protein characteristics and post-translational modifications.
- Immunospecificity and immunogenicity were assessed using antibodies and animal models.
Main Results:
- Streptococcus pneumoniae NagA was found to have four internal disulfide bonds and no post-translational modifications.
- NagA antibodies specifically detected NagA in various S. pneumoniae strains but not in other bacterial species.
- Infection with S. pneumoniae effectively induced NagA antibody production in mice.
Conclusions:
- N-acetylglucosamine-6-phosphate deacetylase (NagA) exhibits high immunogenicity and immunospecificity.
- NagA demonstrates significant potential as a novel diagnostic marker for Streptococcus pneumoniae infections.
More Related Videos
Related Concept Videos
01:14Atypical Pneumonia
01:30Pneumonia III: Complications and Assessment