Our research approach is to understand the virulence of Treponema pallidum, the causative agent of syphilis, by identifying, purifying and characterizing outer envelope proteins of the spirochete that possess important biological functions. Emphasis focuses on treponemal proteins that mediate surface parasitism of eucaryotic cells, probably through recognition of fibronectin or fibronectin-like macromolecules associated with host cell membranes. Chemical dissection of fibronectin will permit analysis of the specific binding region(s) or domain(s) for treponemal outer envelope ligands. This should lead to improved purification of the specific T. pallidum adhesin proteins. A combination of methodologies will be employed which include use of radiolabeling techniques, affinity chromatography, gel electrophoresis, aqueous and selected detergent extracts of treponemal components, radio-immunoassays and microELISA techniques, monoclonal and monospecific antibody reagents, autoradiography-fluorography and electron microscopy. Long term objectives are to define the virulence determinants of T. pallidum and the pathogenesis of syphilis by focusing on receptor-ligand mechanisms of recognition between host macromolecules and surface proteins of T. pallidum. Data presented in the Preliminary Studies and Appendix sections suggest tha these interactions may influence the disease process.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI019566-03
Application #
3128890
Study Section
Bacteriology and Mycology Subcommittee 1 (BM)
Project Start
1983-12-01
Project End
1986-11-30
Budget Start
1985-12-01
Budget End
1986-11-30
Support Year
3
Fiscal Year
1986
Total Cost
Indirect Cost
Name
University of Texas Health Science Center San Antonio
Department
Type
Overall Medical
DUNS #
800772162
City
San Antonio
State
TX
Country
United States
Zip Code
78229
Alderete, J F; Baseman, J B (1989) Serum lipoprotein binding by Treponema pallidum: possible role for proteoglycans. Genitourin Med 65:177-82
Alderete, J F; Peterson, K M; Baseman, J B (1988) Affinities of Treponema pallidum for human lactoferrin and transferrin. Genitourin Med 64:359-63
Peterson, K M; Baseman, J B; Alderete, J F (1987) Cloning structural genes for Treponema pallidum immunogens and characterisation of recombinant treponemal surface protein, P2 (P2 star). Genitourin Med 63:289-96
Peterson, K M; Baseman, J B; Alderete, J F (1986) Isolation of a Treponema pallidum gene encoding immunodominant outer envelope protein P6, which reacts with sera from patients at different stages of syphilis. J Exp Med 164:1160-70
Thomas, D D; Baseman, J B; Alderete, J F (1986) Enhanced levels of attachment of fibronectin-primed Treponema pallidum to extracellular matrix. Infect Immun 52:736-41
Thornburg, R W; Morrison-Plummer, J; Baseman, J B (1985) Monoclonal antibodies to Treponema pallidum: recognition of a major polypeptide antigen. Genitourin Med 61:1-6
Thomas, D D; Baseman, J B; Alderete, J F (1985) Fibronectin mediates Treponema pallidum cytadherence through recognition of fibronectin cell-binding domain. J Exp Med 161:514-25
Thomas, D D; Baseman, J B; Alderete, J F (1985) Putative Treponema pallidum cytadhesins share a common functional domain. Infect Immun 49:833-5
Alderete, J F; Freeman-Shade, L; Baseman, J B (1985) Immunodiagnostic test for detection of serum antibody to Treponema pallidum (syphilis): fibronectin as a capture vehicle for treponemal adhesins. J Immunol Methods 84:365-73
Thomas, D D; Baseman, J B; Alderete, J F (1985) Fibronectin tetrapeptide is target for syphilis spirochete cytadherence. J Exp Med 162:1715-9