The long range goal of this program remains to gain an understanding of the specificity of helper T cells for protein antigens. In current terms this translates to an understanding of the T cells recognition of peptides containing the antigenic determinant, associated with class II gene products of the MHC, Ia. Antigenic peptides are produced from native antigens by antigen presenting cells (APC) through a series of steps which at present are poorly understood. These involve the uptake of the antigen into an acidic intracellular compartment, the proteolysis of the antigen releasing peptide fragments and the association of these fragments with Ia for display on the APC surface. The immediate goals of this program are: to define the physiochemical properties of the antigenic fragments initially produced by the APC and of those ultimately associated with Ia; to elucidate the steps involved in binding of peptides to MHC and how this process is regulated; to explore alternative or secondary routes for peptide-Ia association; and to attempt to gain information of the structural properties of the peptide bound to the MHC by two dimensional NMR analysis. These studies will be carried out using a well characterized soluble globular protein antigen cytochrome c for which the T cell antigenic determinant is known in detail and into which appropriate labels can be introduced. The results of these studies should lend, valuable insights into the mechanism(s) underlying the T cell recognition of antigen and be of value in the design and synthesis of T cell antigenic peptides for use as both vaccines and immunoregulatory agents.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Method to Extend Research in Time (MERIT) Award (R37)
Project #
5R37AI018939-11
Application #
2060814
Study Section
Allergy and Immunology Study Section (ALY)
Project Start
1984-09-30
Project End
1995-07-31
Budget Start
1994-08-01
Budget End
1995-07-31
Support Year
11
Fiscal Year
1994
Total Cost
Indirect Cost
Name
Northwestern University at Chicago
Department
Biochemistry
Type
Schools of Arts and Sciences
DUNS #
City
Evanston
State
IL
Country
United States
Zip Code
60201
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Cheng, P C; Steele, C R; Gu, L et al. (1999) MHC class II antigen processing in B cells: accelerated intracellular targeting of antigens. J Immunol 162:7171-80

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