The goal of this proposal is to understand the molecular basis of the pathogenesis of Neisseria gonorrhoea with specific emphasis on two of its major outer membrane proteins called protein I and Protein III (PI & PIII). PI is the porin of Neisseria gonorrhoea and purified preparations have marked physiologic effects on human polymorphonuclear leukocytes. This antigen is a stable attribute of a particular strain and the antigenic diversity is relatively modest. It has therefore been considered a prime candidate for vaccine development and antibodies have protective effects in model systems. It is proposed that 3' and 5' deletion mutants of this protein will be engineered as well as hybrid PI proteins of two different serotypes and that these mutant proteins will be analyzed immunochemically with monoclonal antibodies to define the topology of the protein, ad the epitopes that are recognized by protective antibodies. Mutant PI proteins with altered porin function will be engineered or selected and their electrical and physiologic properties delineated. PIII is an invariant molecule and it is evident that human complement fixing IgG antibodies to PIII block the bactericidal and opsonic activity of antibodies directed to other surface antigens. It is proposed to construct 3' ad 5' deletions of this protein and analyze these immunochemically to define the topology of the protein and to identify whether epitopes involved in blocking can be distinguished from epitopes that are the target of bactericidal antibodies. If this is successful mutant PIII proteins lacking the blocking epitopes will be engineered and their vaccine potential explored.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI010615-21
Application #
3124741
Study Section
Bacteriology and Mycology Subcommittee 2 (BM)
Project Start
1974-09-01
Project End
1994-08-31
Budget Start
1991-09-01
Budget End
1992-08-31
Support Year
21
Fiscal Year
1991
Total Cost
Indirect Cost
Name
Rockefeller University
Department
Type
Other Domestic Higher Education
DUNS #
071037113
City
New York
State
NY
Country
United States
Zip Code
10065
Gotschlich, E C (1994) Genetic locus for the biosynthesis of the variable portion of Neisseria gonorrhoeae lipooligosaccharide. J Exp Med 180:2181-90
Erwin, A L; Gotschlich, E C (1993) Oxidation of D-lactate and L-lactate by Neisseria meningitidis: purification and cloning of meningococcal D-lactate dehydrogenase. J Bacteriol 175:6382-91
Wetzler, L M; Blake, M S; Barry, K et al. (1992) Gonococcal porin vaccine evaluation: comparison of Por proteosomes, liposomes, and blebs isolated from rmp deletion mutants. J Infect Dis 166:551-5
Weiser, J N; Gotschlich, E C (1991) The role of outer membrane protein A in Escherichia coli K-1 pathogenesis. Trans Assoc Am Physicians 104:278-84
Koomey, M; Bergstrom, S; Blake, M et al. (1991) Pilin expression and processing in pilus mutants of Neisseria gonorrhoeae: critical role of Gly-1 in assembly. Mol Microbiol 5:279-87
Weiser, J N; Gotschlich, E C (1991) Outer membrane protein A (OmpA) contributes to serum resistance and pathogenicity of Escherichia coli K-1. Infect Immun 59:2252-8
Butler, C A; Gotschlich, E C (1991) High-frequency mobilization of broad-host-range plasmids into Neisseria gonorrhoeae requires methylation in the donor. J Bacteriol 173:5793-9
Blaser, M J; Gotschlich, E C (1990) Surface array protein of Campylobacter fetus. Cloning and gene structure. J Biol Chem 265:14529-35
Blake, M S; MacDonald, C M; Klugman, K P (1989) Colony morphology of piliated Neisseria meningitidis. J Exp Med 170:1727-36
Murakami, K; Gotschlich, E C; Seiff, M E (1989) Cloning and characterization of the structural gene for the class 2 protein of Neisseria meningitidis. Infect Immun 57:2318-23

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