Active and Passive Immunizations with the Streptococcal Esterase Sse Protect Mice against Subcutaneous Infection with Group A Streptococci
Open Access
- 1 July 2007
- journal article
- research article
- Published by American Society for Microbiology in Infection and Immunity
- Vol. 75 (7), 3651-3657
- https://doi.org/10.1128/iai.00038-07
Abstract
The human pathogen group AStreptococcus(GAS) produces many secreted proteins that play important roles in GAS pathogenesis, including hydrolases that degrade proteins and nucleic acids. This study targets another kind of hydrolase, carboxylic esterase, with the objectives of identifying GAS esterase and determining whether it is a protective antigen. The putative esterase gene SPy1718 was cloned, and the recombinant protein (Sse) was prepared. Sse was detected in GAS culture supernatant, and patients with streptococcal pharyngitis seroconverted to Sse, indicating that Sse was produced in vivo and in vitro. Sse hydrolyzesp-nitrophenyl butyrate, and the residue178Ser is critical for this esterase activity. There are two Sse variant complexes according to the available genome databases, consistent with the previous finding of two antigenic Sse variants. Complex I includes serotypes M1, M2, M3, M5, M6, M12, and M18, whereas M4, M28, and M49 belong to complex II. Sse variants share >98% identity in amino acid sequence within each complex but have about 37% variation between the two groups. Active immunization with M1 Sse significantly protects mice against lethal subcutaneous infection with virulent M1 and M3 strains and inhibits GAS invasion of mouse skin tissue. Passive immunization with anti-Sse antiserum also significantly protects mice against subcutaneous GAS infection, indicating that the protection is mediated by Sse-specific antibodies. The results suggest that Sse plays an important role in tissue invasion and is an antigen protective in subcutaneous infection against GAS strains of more than one serotype.Keywords
This publication has 35 references indexed in Scilit:
- Multivalent Group A Streptococcal Vaccine Elicits Bactericidal Antibodies against Variant M SubtypesClinical and Vaccine Immunology, 2005
- Identification and Characterization of HtsA, a Second Heme-Binding Protein Made byStreptococcus pyogenesInfection and Immunity, 2003
- Identification and Immunogenicity of Group AStreptococcusCulture Supernatant ProteinsInfection and Immunity, 2000
- Toxoids of Streptococcal Pyrogenic Exotoxin A Are Protective in Rabbit Models of Streptococcal Toxic Shock SyndromeInfection and Immunity, 2000
- New protective antigen of group A streptococciJCI Insight, 1999
- Protective Immune Response againstStreptococcus pyogenesin Mice after Intranasal Vaccination with the Fibronectin‐Binding Protein SfbIThe Journal of Infectious Diseases, 1999
- Rapid Molecular Genetic Subtyping of Serotype M1 Group AStreptococcusStrainsEmerging Infectious Diseases, 1999
- Extracellular Esterase of Group A Streptococci : Esterase in Extracellular Concentrates of Group A Streptococci and the Homologous AntibodyNature, 1961
- Type-specific Antibody Formation in Man Following Injection of Streptococcal M ProteinThe Journal of Infectious Diseases, 1960
- PREPARATION AND PROPERTIES OF A PROTEIN (R ANTIGEN) OCCURRING IN STREPTOCOCCI OF GROUP A, TYPE 28 AND IN CERTAIN STREPTOCOCCI OF OTHER SEROLOGICAL GROUPSThe Journal of Experimental Medicine, 1952