Article ; Online: Unconventional Peptide Presentation by Classical MHC Class I and Implications for T and NK Cell Activation.
International journal of molecular sciences
2020 Volume 21, Issue 20
Abstract: T cell-mediated immune recognition of peptides is initiated upon binding of the antigen receptor on T cells (TCR) to the peptide-MHC complex. TCRs are typically restricted by a particular MHC allele, while polymorphism within the MHC molecule can affect ... ...
| Abstract | T cell-mediated immune recognition of peptides is initiated upon binding of the antigen receptor on T cells (TCR) to the peptide-MHC complex. TCRs are typically restricted by a particular MHC allele, while polymorphism within the MHC molecule can affect the spectrum of peptides that are bound and presented to the TCR. Classical MHC Class I molecules have a confined binding groove that restricts the length of the presented peptides to typically 8-11 amino acids. Both N- and C-termini of the peptide are bound within binding pockets, allowing the TCR to dock in a diagonal orientation above the MHC-peptide complex. Longer peptides have been observed to bind either in a bulged or zig-zag orientation within the binding groove. More recently, unconventional peptide presentation has been reported for different MHC I molecules. Here, either N- or C-terminal amino acid additions to conventionally presented peptides induced a structural change either within the MHC I molecule that opened the confined binding groove or within the peptide itself, allowing the peptide ends to protrude into the solvent. Since both TCRs on T cells and killer immunoglobulin receptors on Natural Killer (NK) cells contact the MHC I molecule above or at the periphery of the peptide binding groove, unconventionally presented peptides could modulate both T cell and NK cell responses. We will highlight recent advances in our understanding of the functional consequences of unconventional peptide presentation in cellular immunity. |
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| MeSH term(s) | Antigen Presentation ; Histocompatibility Antigens Class I/chemistry ; Histocompatibility Antigens Class I/immunology ; Humans ; Killer Cells, Natural/immunology ; Lymphocyte Activation ; Receptors, KIR/chemistry ; Receptors, KIR/immunology ; T-Lymphocytes/immunology |
| Chemical Substances | Histocompatibility Antigens Class I ; Receptors, KIR |
| Language | English |
| Publishing date | 2020-10-13 |
| Publishing country | Switzerland |
| Document type | Journal Article ; Review |
| ZDB-ID | 2019364-6 |
| ISSN | 1422-0067 ; 1422-0067 ; 1661-6596 |
| ISSN (online) | 1422-0067 |
| ISSN | 1422-0067 ; 1661-6596 |
| DOI | 10.3390/ijms21207561 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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