title: Identification of high immunoreactive proteins from Streptococcus agalactiae isolates recognized by human serum antibodies.
abstract: The aim of the studies was to identify immunogenic proteins of Streptococcus agalactiae (group B streptococcus; GBS) isolates. Investigation of the immunoreactivity with human sera allowed us to determine major immunogenic proteins which might be potential candidates for the development of vaccine. For the study, we have selected 60 genetically different, well-characterized GBS clinical isolates. The proteins immunoreactivity with 24 human sera from patients with GBS infections, carriers, and control group without GBS was detected by SDS-PAGE and Western blotting. As a result, some major immunogenic proteins were identified, of which four proteins with molecular masses of about 45 to 50 kDa, which exhibited the highest immunoreactivity features, were analyzed by LC-MS/MS. The proteins were identified by comparative analysis of peptides masses using MASCOT and statistical analysis. The results showed known molecules such as enolase (47.4 kDa), aldehyde dehydrogenase (50.6 kDa), and ones not previously described such as trigger factor (47 kDa) and elongation factor Tu (44 kDa). The preliminary results indicated that some GBS proteins that elicit protective immunity hold promise not only as components in a vaccine as antigens but also as carriers or adjuvants in polysaccharide conjugate vaccines, but more studies are needed.
authors.affiliation: Department of Bacteriology, Microbial Ecology and Parasitology, Jagiellonian University Medical College, Krakow, Poland.
authors.forename: Monika
authors.initials: M
authors.lastname: Brzychczy-Wloch
authors.forename: Sabina
authors.initials: S
authors.lastname: Gorska
authors.forename: Ewa
authors.initials: E
authors.lastname: Brzozowska
authors.forename: Andrzej
authors.initials: A
authors.lastname: Gamian
authors.forename: Piotr B
authors.initials: PB
authors.lastname: Heczko
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Bulanda
mesh_terms: D000907:Antibodies, Bacterial / Q000097:blood / Q000378:metabolism*; D000942:Antigens, Bacterial / Q000235:genetics / Q000276:immunology*; D002853:Chromatography, Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D013292:Streptococcus agalactiae / Q000235:genetics / Q000276:immunology*; D053719:Tandem Mass Spectrometry
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial
keywords: Streptococcus agalactiae (GBS); immunogenic proteins; pregnant women; vaccination