The overall goal of this project is to develop a safe and effective vaccine to prevent group A streptococcal (GAS) infections and their most serious complications, acute rheumatic fever (ARF), rheumatic heart disease (RHD) and invasive disease. We have made considerable progress in developing progressively complex recombinant multivalent M protein-based vaccines containing type-specific protective peptides from as many as 30 different M serotypes of GAS that account for 80-95% of infections in North America and Europe. Epidemiologic data from developing countries, where the burden of ARF/RHD is extraordinarily high, suggest that the potential efficacy of the 30-valent vaccine would only approach 50%. In our efforts to identify surface antigens of GAS that could be combined with M proteins to improve vaccine efficacy, we discovered that M- related protein (Mrp) of GAS evokes bactericidal antibodies against homologous and heterologous serotypes of GAS. Eighty-three percent of the 125 defined M types of GAS are Mrp-positive. Importantly, analysis of the Mrp sequences from 11 serotypes of GAS indicates a striking conservation of structure among three related families of Mrp, suggesting that cross-protective immunity may be achieved using a minimum number of protein fragments. Therefore, we have refined our approach to the development of a broadly protective vaccine by proposing to combine the current 30-valent M protein-based vaccine with cross-protective peptides of Mrp. In this application, we propose to: a) define the breadth of cross-protective immunity evoked by Mrp, b) determine the covalent structures of Mrp that contain cross-protective epitopes, and c) define the potential protective efficacy in animals of vaccines combining recombinant hybrid Mrp peptides with the 30-valent M protein-based vaccine. This project takes advantage of our experience using innovative approaches in the design and application of novel recombinant vaccine proteins, our ongoing studies to determine the epidemiology of GAS infections in Mali and South Africa, and our discovery that Mrp evokes serotype cross- protective immune responses in animals.

Public Health Relevance

The world needs an effective, safe and affordable vaccine to prevent group A streptococcal (GAS) infections. Although most GAS infections are mild, there are more than 18 million people with a chronic complication of a severe GAS disease worldwide, over 15 million of whom have rheumatic heart disease, another 2 million cases of severe disease occur each year and a total of 517,000 deaths annually are estimated to be due to this organism. Vaccine prevention of even a fraction of these life-threatening diseases could have a significant impact on the health of people around the world.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
4R01AI010085-51
Application #
8958765
Study Section
Vaccines Against Microbial Diseases Study Section (VMD)
Program Officer
GU, Xin-Xing
Project Start
1996-06-01
Project End
2017-11-30
Budget Start
2015-12-01
Budget End
2017-11-30
Support Year
51
Fiscal Year
2016
Total Cost
Indirect Cost
Name
University of Tennessee Health Science Center
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
941884009
City
Memphis
State
TN
Country
United States
Zip Code
38103
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Niedermeyer, Shannon E; Penfound, Thomas A; Hohn, Claudia et al. (2014) Group A streptococcus expresses a trio of surface proteins containing protective epitopes. Clin Vaccine Immunol 21:1421-5

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