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Antigen unfolding and disulfide reduction in antigen presenting cells
1Department of Pathology, Emory University, Atlanta, GA 30322, USA.
Seminars in Immunology
|December 1, 1995
Summary
The generation of peptides for CD4+ helper T cells involves protein unfolding and cleavage. Disulfide bond reduction in endocytic compartments is a likely rate-limiting step for antigen processing.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- CD4+ T cells recognize peptides presented by MHC class II molecules on antigen-presenting cells.
- The precise mechanisms of peptide generation from protein antigens remain largely unknown.
- Protein unfolding is a prerequisite for cleavage and MHC binding.
Purpose of the Study:
- To investigate the sequence of events in peptide generation from protein antigens.
- To explore the role of protein unfolding, specifically disulfide bond reduction, in antigen processing.
- To review evidence for disulfide reduction in endocytic compartments and propose mechanisms.
Main Methods:
- Review of existing literature on antigen processing and disulfide bond reduction.
- Analysis of evidence for disulfide bond reduction within endocytic pathways.
- Proposal of potential biochemical mechanisms for disulfide bond reduction.
Main Results:
- Protein unfolding is necessary for efficient antigen processing.
- Disulfide bond reduction is a potential rate-limiting step in the unfolding of many antigens.
- Evidence suggests disulfide reduction occurs in endocytic compartments.
Conclusions:
- Disulfide bond reduction is a critical, potentially rate-limiting, step in the processing of antigens for CD4+ T cell recognition.
- Understanding these mechanisms can elucidate antigen presentation pathways.
- Further research into the mechanisms of disulfide reduction in endocytic compartments is warranted.