51
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Rego S, Heal TJ, Pidwill GR, Till M, Robson A, Lamont RJ, Sessions RB, Jenkinson HF, Race PR, Nobbs AH. Structural and Functional Analysis of Cell Wall-anchored Polypeptide Adhesin BspA in Streptococcus agalactiae. J Biol Chem 2016; 291:15985-6000. [PMID: 27311712 DOI: 10.1074/jbc.m116.726562] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Indexed: 12/21/2022] Open
Abstract
Streptococcus agalactiae (group B Streptococcus, GBS) is the predominant cause of early-onset infectious disease in neonates and is responsible for life-threatening infections in elderly and immunocompromised individuals. Clinical manifestations of GBS infection include sepsis, pneumonia, and meningitis. Here, we describe BspA, a deviant antigen I/II family polypeptide that confers adhesive properties linked to pathogenesis in GBS. Heterologous expression of BspA on the surface of the non-adherent bacterium Lactococcus lactis confers adherence to scavenger receptor gp340, human vaginal epithelium, and to the fungus Candida albicans Complementary crystallographic and biophysical characterization of BspA reveal a novel β-sandwich adhesion domain and unique asparagine-dependent super-helical stalk. Collectively, these findings establish a new bacterial adhesin structure that has in effect been hijacked by a pathogenic Streptococcus species to provide competitive advantage in human mucosal infections.
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Affiliation(s)
- Sara Rego
- From the School of Oral and Dental Sciences, University of Bristol, Bristol BS1 2LY, United Kingdom, the School of Biochemistry, University of Bristol, Bristol BS8 1TD, United Kingdom
| | - Timothy J Heal
- the School of Biochemistry, University of Bristol, Bristol BS8 1TD, United Kingdom, the Bristol Centre for Functional Nanomaterials, University of Bristol, Bristol BS8 1TL, United Kingdom
| | - Grace R Pidwill
- From the School of Oral and Dental Sciences, University of Bristol, Bristol BS1 2LY, United Kingdom
| | - Marisa Till
- the School of Biochemistry, University of Bristol, Bristol BS8 1TD, United Kingdom, the BrisSynBio Synthetic Biology Research Centre, University of Bristol, Bristol BS8 1TQ, United Kingdom, and
| | - Alice Robson
- the School of Biochemistry, University of Bristol, Bristol BS8 1TD, United Kingdom
| | - Richard J Lamont
- the Department of Oral Immunology and Infectious Diseases, University of Louisville, Louisville, Kentucky 40202
| | - Richard B Sessions
- the School of Biochemistry, University of Bristol, Bristol BS8 1TD, United Kingdom, the BrisSynBio Synthetic Biology Research Centre, University of Bristol, Bristol BS8 1TQ, United Kingdom, and
| | - Howard F Jenkinson
- From the School of Oral and Dental Sciences, University of Bristol, Bristol BS1 2LY, United Kingdom
| | - Paul R Race
- the School of Biochemistry, University of Bristol, Bristol BS8 1TD, United Kingdom, the BrisSynBio Synthetic Biology Research Centre, University of Bristol, Bristol BS8 1TQ, United Kingdom, and
| | - Angela H Nobbs
- From the School of Oral and Dental Sciences, University of Bristol, Bristol BS1 2LY, United Kingdom,
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52
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Buscetta M, Firon A, Pietrocola G, Biondo C, Mancuso G, Midiri A, Romeo L, Galbo R, Venza M, Venza I, Kaminski PA, Gominet M, Teti G, Speziale P, Trieu-Cuot P, Beninati C. PbsP, a cell wall-anchored protein that binds plasminogen to promote hematogenous dissemination of group B Streptococcus. Mol Microbiol 2016; 101:27-41. [PMID: 26888569 DOI: 10.1111/mmi.13357] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/15/2016] [Indexed: 02/04/2023]
Abstract
Streptococcus agalactiae (Group B Streptococcus or GBS) is a leading cause of invasive infections in neonates whose virulence is dependent on its ability to interact with cells and host components. We here characterized a surface protein with a critical function in GBS pathophysiology. This adhesin, designated PbsP, possesses two Streptococcal Surface Repeat domains, a methionine and lysine-rich region, and a LPXTG cell wall-anchoring motif. PbsP mediates plasminogen (Plg) binding both in vitro and in vivo and we showed that cell surface-bound Plg can be activated into plasmin by tissue plasminogen activator to increase the bacterial extracellular proteolytic activity. Absence of PbsP results in a decreased bacterial transmigration across brain endothelial cells and impaired virulence in a murine model of infection. PbsP is conserved among the main GBS lineages and is a major plasminogen adhesin in non-CC17 GBS strains. Importantly, immunization of mice with recombinant PbsP confers protective immunity. Our results indicate that GBS have evolved different strategies to recruit Plg which indicates that the ability to acquire cell surface proteolytic activity is essential for the invasiveness of this bacterium.
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Affiliation(s)
- Marco Buscetta
- Metchnikoff Laboratory, Departments of Human Pathology and Medicine, University of Messina, Messina, Italy.,Institut Pasteur, Unité de Biologie des Bactéries Pathogènes à Gram Positif, CNRS ERL3526, 75015, Paris, France
| | - Arnaud Firon
- Institut Pasteur, Unité de Biologie des Bactéries Pathogènes à Gram Positif, CNRS ERL3526, 75015, Paris, France
| | - Giampiero Pietrocola
- Department of Molecular Medicine, Unit of Biochemistry, University of Pavia, Pavia, Italy
| | - Carmelo Biondo
- Metchnikoff Laboratory, Departments of Human Pathology and Medicine, University of Messina, Messina, Italy
| | - Giuseppe Mancuso
- Metchnikoff Laboratory, Departments of Human Pathology and Medicine, University of Messina, Messina, Italy
| | - Angelina Midiri
- Metchnikoff Laboratory, Departments of Human Pathology and Medicine, University of Messina, Messina, Italy
| | - Letizia Romeo
- Metchnikoff Laboratory, Departments of Human Pathology and Medicine, University of Messina, Messina, Italy
| | - Roberta Galbo
- Metchnikoff Laboratory, Departments of Human Pathology and Medicine, University of Messina, Messina, Italy
| | - Mario Venza
- Metchnikoff Laboratory, Departments of Human Pathology and Medicine, University of Messina, Messina, Italy
| | - Isabella Venza
- Metchnikoff Laboratory, Departments of Human Pathology and Medicine, University of Messina, Messina, Italy
| | - Pierre-Alexandre Kaminski
- Institut Pasteur, Unité de Biologie des Bactéries Pathogènes à Gram Positif, CNRS ERL3526, 75015, Paris, France
| | - Myriam Gominet
- Institut Pasteur, Unité de Biologie des Bactéries Pathogènes à Gram Positif, CNRS ERL3526, 75015, Paris, France
| | - Giuseppe Teti
- Metchnikoff Laboratory, Departments of Human Pathology and Medicine, University of Messina, Messina, Italy
| | - Pietro Speziale
- Department of Molecular Medicine, Unit of Biochemistry, University of Pavia, Pavia, Italy
| | - Patrick Trieu-Cuot
- Institut Pasteur, Unité de Biologie des Bactéries Pathogènes à Gram Positif, CNRS ERL3526, 75015, Paris, France
| | - Concetta Beninati
- Metchnikoff Laboratory, Departments of Human Pathology and Medicine, University of Messina, Messina, Italy.,Scylla Biotech Srl, Messina, Italy
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53
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Zhu F, Wu H. Insights into bacterial protein glycosylation in human microbiota. SCIENCE CHINA. LIFE SCIENCES 2016; 59:11-8. [PMID: 26712033 PMCID: PMC5298937 DOI: 10.1007/s11427-015-4980-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Accepted: 11/05/2015] [Indexed: 01/14/2023]
Abstract
The study of human microbiota is an emerging research topic. The past efforts have mainly centered on studying the composition and genomic landscape of bacterial species within the targeted communities. The interaction between bacteria and hosts is the pivotal event in the initiation and progression of infectious diseases. There is a great need to identify and characterize the molecules that mediate the bacteria-host interaction. Bacterial surface exposed proteins play an important role in the bacteria- host interaction. Numerous surface proteins are glycosylated, and the glycosylation is crucial for their function in mediating the bacterial interaction with hosts. Here we present an overview of surface glycoproteins from bacteria that inhabit three major mucosal environments across human body: oral, gut and skin. We describe the important enzymes involved in the process of protein glycosylation, and discuss how the process impacts the bacteria-host interaction. Emerging molecular details underlying glycosylation of bacterial surface proteins may lead to new opportunities for designing anti-infective small molecules, and developing novel vaccines in order to treat or prevent bacterial infection.
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Affiliation(s)
- Fan Zhu
- Departments of Microbiology and Pediatric Dentistry, Schools of Dentistry and Medicine, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Hui Wu
- Departments of Microbiology and Pediatric Dentistry, Schools of Dentistry and Medicine, University of Alabama at Birmingham, Birmingham, AL, 35294, USA.
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54
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Patras KA, Rösler B, Thoman ML, Doran KS. Characterization of host immunity during persistent vaginal colonization by Group B Streptococcus. Mucosal Immunol 2015; 8:1339-48. [PMID: 25850655 PMCID: PMC4598252 DOI: 10.1038/mi.2015.23] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 02/17/2015] [Indexed: 02/04/2023]
Abstract
Streptococcus agalactiae (Group B Streptococcus, GBS) is a Gram-positive bacterium, which colonizes the vaginal tract in 10-30% of women. Colonization is transient in nature, and little is known about the host and bacterial factors controlling GBS persistence. Gaining insight into these factors is essential for developing therapeutics to limit maternal GBS carriage and prevent transmission to the susceptible newborn. In this work, we have used human cervical and vaginal epithelial cells, and our established mouse model of GBS vaginal colonization, to characterize key host factors that respond during GBS colonization. We identify a GBS strain that persists beyond a month in the murine vagina, whereas other strains are more readily cleared. Correspondingly, we have detected differential cytokine production in human cell lines after challenge with the persistent strain vs. other GBS strains. We also demonstrate that the persistent strain more readily invades cervical cells compared with vaginal cells, suggesting that GBS may potentially use the cervix as a reservoir to establish long-term colonization. Furthermore, we have identified interleukin-17 production in response to long-term colonization, which is associated with eventual clearance of GBS. We conclude that both GBS strain differences and concurrent host immune responses are crucial in modulating vaginal colonization.
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Affiliation(s)
- Kathryn A. Patras
- Department of Biology and Center for Microbial Sciences, San Diego State University, San Diego, California, 92182, USA
| | - Berenice Rösler
- Department of Biology and Center for Microbial Sciences, San Diego State University, San Diego, California, 92182, USA
| | - Marilyn L. Thoman
- BioScience Center, San Diego State University, San Diego, California, 92182, USA
| | - Kelly S. Doran
- Department of Biology and Center for Microbial Sciences, San Diego State University, San Diego, California, 92182, USA,Department of Pediatrics, University of California San Diego School of Medicine, La Jolla, California, 92093, USA,Corresponding author: Kelly S. Doran, Department of Biology and Center for Microbial Sciences, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA. Phone: 619-594-1867, Fax: 619-594-5676,
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55
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Bergal A, Loucif L, Benouareth DE, Bentorki AA, Abat C, Rolain JM. Molecular epidemiology and distribution of serotypes, genotypes, and antibiotic resistance genes of Streptococcus agalactiae clinical isolates from Guelma, Algeria and Marseille, France. Eur J Clin Microbiol Infect Dis 2015; 34:2339-48. [PMID: 26415872 DOI: 10.1007/s10096-015-2487-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 09/03/2015] [Indexed: 02/05/2023]
Abstract
This study describes, for the first time, the genetic and phenotypic diversity among 93 Streptococcus agalactiae (group B Streptococcus, GBS) isolates collected from Guelma, Algeria and Marseille, France. All strains were identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The molecular support of antibiotic resistance and serotyping were investigated by polymerase chain reaction (PCR). The phylogenetic lineage of each GBS isolate was determined by multilocus sequence typing (MLST) and grouped into clonal complexes (CCs) using eBURST. The isolates represented 37 sequence types (STs), 16 of which were novel, grouped into five CCs, and belonging to seven serotypes. Serotype V was the most prevalent serotype in our collection (44.1%). GBS isolates of each serotype were distributed among multiple CCs, including cps III/CC19, cps V/CC1, cps Ia/CC23, cps II/CC10, and cps III/CC17. All isolates presented susceptibility to penicillin, whereas resistance to erythromycin was detected in 40% and tetracycline in 82.2% of isolates. Of the 37 erythromycin-resistant isolates, 75.7% showed the macrolide-lincosamide-streptogramin B (MLSB)-resistant phenotype and 24.3% exhibited the macrolide (M)-resistant phenotype. Constitutive MLSB resistance (46%) mediated by the ermB gene was significantly associated with the Guelma isolates, whereas the M resistance phenotype (24.3%) mediated by the mefA/E gene dominated among the Marseille isolates and belonged to ST-23. Tetracycline resistance was predominantly due to tetM, which was detected alone (95.1%) or associated with tetO (3.7%). These results provide epidemiological data in these regions that establish a basis for monitoring increased resistance to erythromycin and also provide insight into correlations among clones, serotypes, and resistance genes.
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Affiliation(s)
- A Bergal
- Facultés de Médecine et de Pharmacie, Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1905, IHU Méditerranée Infection, Marseille, France.,Département d'Écologie et Génie de l'Environnement, Faculté des Sciences de la Nature et de la Vie et Sciences de la Terre et de l'Univers, Université 8 Mai 1945, Guelma, Algeria
| | - L Loucif
- Facultés de Médecine et de Pharmacie, Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1905, IHU Méditerranée Infection, Marseille, France.,Laboratoire de Biotechnologie des Molécules Bioactives et de la Physiopathologie Cellulaire (LBMBPC), Université El Hadj Lakhdar, Batna, Algeria
| | - D E Benouareth
- Département d'Écologie et Génie de l'Environnement, Faculté des Sciences de la Nature et de la Vie et Sciences de la Terre et de l'Univers, Université 8 Mai 1945, Guelma, Algeria
| | - A A Bentorki
- Laboratoire de Microbiologie, CHU Dorban, Annaba, Algeria
| | - C Abat
- Facultés de Médecine et de Pharmacie, Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1905, IHU Méditerranée Infection, Marseille, France
| | - J-M Rolain
- Facultés de Médecine et de Pharmacie, Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1905, IHU Méditerranée Infection, Marseille, France.
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56
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Six A, Bellais S, Bouaboud A, Fouet A, Gabriel C, Tazi A, Dramsi S, Trieu-Cuot P, Poyart C. Srr2, a multifaceted adhesin expressed by ST-17 hypervirulent Group B Streptococcus involved in binding to both fibrinogen and plasminogen. Mol Microbiol 2015; 97:1209-22. [PMID: 26094503 DOI: 10.1111/mmi.13097] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/18/2015] [Indexed: 11/30/2022]
Abstract
The Group B Streptococcus (GBS) 'hypervirulent' ST-17 clone is strongly associated with invasive neonatal meningitis. Comparative genome analyses revealed that the serine-rich repeat (Srr) glycoprotein Srr2 is a cell wall-anchored protein specific for ST-17 strains, the non-ST-17 isolates expressing Srr1. Here, we unravel the binding capacity of GBS Srr proteins to relevant components of the host fibrinolysis pathway. We demonstrate that: (i) Srr2 binds plasminogen and plasmin whereas Srr1 does not; (ii) the ability of ST-17 strains to bind fibrinogen reflects a high level surface display of Srr2 combined with a higher affinity of Srr2 than Srr1 to bind this ligand; and (iii) Srr2 binding to host plasma proteins results in the formation of bacterial aggregates that are efficiently endocytosed by phagocytes. Importantly, we show that Srr2 increased bacterial survival to phagocytic killing and bacterial persistence in a murine model of meningitis. We conclude that Srr2 is a multifaceted adhesin used by the ST-17 clone to hijack ligands of the host coagulation system, thereby contributing to bacterial dissemination and invasiveness, and ultimately to meningitis.
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Affiliation(s)
- Anne Six
- INSERM U 1016, Institut Cochin, team 'Barriers and Pathogens', Paris, F-75014, France.,CNRS UMR 8104, Paris, F-75014, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75014, France.,DHU 'Risques et grossesse', Assistance Publique Hôpitaux de Paris, Paris, France
| | - Samuel Bellais
- INSERM U 1016, Institut Cochin, team 'Barriers and Pathogens', Paris, F-75014, France.,CNRS UMR 8104, Paris, F-75014, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75014, France.,DHU 'Risques et grossesse', Assistance Publique Hôpitaux de Paris, Paris, France
| | - Abdelouhab Bouaboud
- INSERM U 1016, Institut Cochin, team 'Barriers and Pathogens', Paris, F-75014, France.,CNRS UMR 8104, Paris, F-75014, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75014, France.,DHU 'Risques et grossesse', Assistance Publique Hôpitaux de Paris, Paris, France
| | - Agnès Fouet
- INSERM U 1016, Institut Cochin, team 'Barriers and Pathogens', Paris, F-75014, France.,CNRS UMR 8104, Paris, F-75014, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75014, France.,DHU 'Risques et grossesse', Assistance Publique Hôpitaux de Paris, Paris, France.,Centre National de Référence des Streptocoques, Paris, F-75014, France
| | - Christelle Gabriel
- INSERM U 1016, Institut Cochin, team 'Barriers and Pathogens', Paris, F-75014, France.,CNRS UMR 8104, Paris, F-75014, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75014, France.,DHU 'Risques et grossesse', Assistance Publique Hôpitaux de Paris, Paris, France
| | - Asmaa Tazi
- INSERM U 1016, Institut Cochin, team 'Barriers and Pathogens', Paris, F-75014, France.,CNRS UMR 8104, Paris, F-75014, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75014, France.,DHU 'Risques et grossesse', Assistance Publique Hôpitaux de Paris, Paris, France.,Centre National de Référence des Streptocoques, Paris, F-75014, France.,Hôpitaux Universitaires Paris Centre Cochin-Hôtel Dieu-Broca, Assistance Publique Hôpitaux de Paris, Paris, F-75014, France
| | - Shaynoor Dramsi
- Institut Pasteur, Unité de Biologie des Bactéries Pathogènes à Gram Positif, Paris, F-74016, France.,CNRS ERL3526, Paris, France
| | - Patrick Trieu-Cuot
- Institut Pasteur, Unité de Biologie des Bactéries Pathogènes à Gram Positif, Paris, F-74016, France.,CNRS ERL3526, Paris, France
| | - Claire Poyart
- INSERM U 1016, Institut Cochin, team 'Barriers and Pathogens', Paris, F-75014, France.,CNRS UMR 8104, Paris, F-75014, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, F-75014, France.,DHU 'Risques et grossesse', Assistance Publique Hôpitaux de Paris, Paris, France.,Institut Pasteur, Unité de Biologie des Bactéries Pathogènes à Gram Positif, Paris, F-74016, France.,CNRS ERL3526, Paris, France.,Centre National de Référence des Streptocoques, Paris, F-75014, France.,Hôpitaux Universitaires Paris Centre Cochin-Hôtel Dieu-Broca, Assistance Publique Hôpitaux de Paris, Paris, F-75014, France
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57
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Streptococcus salivarius K12 Limits Group B Streptococcus Vaginal Colonization. Infect Immun 2015; 83:3438-44. [PMID: 26077762 DOI: 10.1128/iai.00409-15] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 06/10/2015] [Indexed: 01/11/2023] Open
Abstract
Streptococcus agalactiae (group B streptococcus [GBS]) colonizes the rectovaginal tract in 20% to 30% of women and during pregnancy can be transmitted to the newborn, causing severe invasive disease. Current routine screening and antibiotic prophylaxis have fallen short of complete prevention of GBS transmission, and GBS remains a leading cause of neonatal infection. We have investigated the ability of Streptococcus salivarius, a predominant member of the native human oral microbiota, to control GBS colonization. Comparison of the antibacterial activities of multiple S. salivarius strains by use of a deferred-antagonism test showed that S. salivarius strain K12 exhibited the broadest spectrum of activity against GBS. K12 effectively inhibited all GBS strains tested, including disease-implicated isolates from newborns and colonizing isolates from the vaginal tract of pregnant women. Inhibition was dependent on the presence of megaplasmid pSsal-K12, which encodes the bacteriocins salivaricin A and salivaricin B; however, in coculture experiments, GBS growth was impeded by K12 independently of the megaplasmid. We also demonstrated that K12 adheres to and invades human vaginal epithelial cells at levels comparable to GBS. Inhibitory activity of K12 was examined in vivo using a mouse model of GBS vaginal colonization. Mice colonized with GBS were treated vaginally with K12. K12 administration significantly reduced GBS vaginal colonization in comparison to nontreated controls, and this effect was partially dependent on the K12 megaplasmid. Our results suggest that K12 may have potential as a preventative therapy to control GBS vaginal colonization and thereby prevent its transmission to the neonate during pregnancy.
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