The long-term objective of this study is to explore which fimbrial epitopes of black-pigmented Bacteroides mediate colonization to eukaryotic cell surfaces. Specifically, the fimbrial proteins from oral black-pigmented Bacteroides, including B. gingivalis, B. intermedius, and B. intermedius, and B. endodontalis, will be purified, and a library of monoclonal antibodies against their natural epitopes will be prepared. These monoclonal reagents will be tested for their ability to inhibit fimbrial attachment to epithelial cells. This will permit us to identify fimbrial epitopes of biological relevance. These epitopes will then be characterized with regard to their primary peptide structure and conformation. Next, the peptides of important regions of the fimbrial molecules will be synthesized and their immunogenicity with various carriers will be determined in an attempt to elicit antibodies which would inhibit fimbrial mediated epithelial attachment. The synthetic peptides will then be coupled to iodinatable heterobifunctional crosslinking agents to identify receptors on epithelial cells which mediate fimbrial attachment. Biochemical and immunochemical methods will be used with an emphasis on production and analysis of synthetic peptides. The functional assays include evaluation of the binding of black-pigmented Bacteroides to epithelial cells. The significance of these findings resides in the potential importance of fimbriae in the colonization of black-pigmented Bacteroides. Fimbriae are likely responsible for colonization by interacting with epithelial cells, other bacteria in coaggregates, and may be important in interacting with the host protective cells, such as neutrophils. Once these virulence-mediating functions have been elucidated, and the domains of the fimbriae responsible for these interactions identified, design of vaccines using synthetic peptides of critical domains could be considered. Thus, the studies outlined in this subproject could then provide the groundwork for a rational approach for immunization to modulate colonization of black-pigmented Bacteroides.

Agency
National Institute of Health (NIH)
Institute
National Institute of Dental & Craniofacial Research (NIDCR)
Type
Specialized Center (P50)
Project #
1P50DE008240-01
Application #
3940176
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
1
Fiscal Year
1987
Total Cost
Indirect Cost
Name
State University of New York at Buffalo
Department
Type
DUNS #
038633251
City
Buffalo
State
NY
Country
United States
Zip Code
14260
Ohkusa, Toshifumi; Yoshida, Tsutomu; Sato, Nobuhiro et al. (2009) Commensal bacteria can enter colonic epithelial cells and induce proinflammatory cytokine secretion: a possible pathogenic mechanism of ulcerative colitis. J Med Microbiol 58:535-45
Sojar, Hakimuddin T; Genco, Robert J (2005) Identification of glyceraldehyde-3-phosphate dehydrogenase of epithelial cells as a second molecule that binds to Porphyromonas gingivalis fimbriae. FEMS Immunol Med Microbiol 45:25-30
Satyanarayana, J; Gururaja, T L; Narasimhamurthy, S et al. (2001) Synthesis and conformational features of human salivary mucin C-terminal derived peptide epitope carrying Thomsen-Friedenreich antigen: implications for its role in self-association. Biopolymers 58:500-10
Narasimhamurthy, S; Naganagowda, G A; Janagani, S et al. (2000) Solution structure of O-glycosylated C-terminal leucine zipper domain of human salivary mucin (MUC7). J Biomol Struct Dyn 18:145-54
Gururaja, T L; Levine, J H; Tran, D T et al. (1999) Candidacidal activity prompted by N-terminus histatin-like domain of human salivary mucin (MUC7)1. Biochim Biophys Acta 1431:107-19
Tseng, C C; Miyamoto, M; Ramalingam, K et al. (1999) The roles of histidine residues at the starch-binding site in streptococcal-binding activities of human salivary amylase. Arch Oral Biol 44:119-27
Naganagowda, G A; Gururaja, T L; Satyanarayana, J et al. (1999) NMR analysis of human salivary mucin (MUC7) derived O-linked model glycopeptides: comparison of structural features and carbohydrate-peptide interactions. J Pept Res 54:290-310
Sojar, H T; Han, Y; Hamada, N et al. (1999) Role of the amino-terminal region of Porphyromonas gingivalis fimbriae in adherence to epithelial cells. Infect Immun 67:6173-6
Mettath, S; Munson, B R; Pandey, R K (1999) DNA interaction and photocleavage properties of porphyrins containing cationic substituents at the peripheral position. Bioconjug Chem 10:94-102
Satyanarayana, J; Gururaja, T L; Naganagowda, G A et al. (1998) A concise methodology for the stereoselective synthesis of O-glycosylated amino acid building blocks: complete 1H NMR assignments and their application in solid-phase glycopeptide synthesis. J Pept Res 52:165-79

Showing the most recent 10 out of 162 publications