Back to Search
Start Over
Origin and evolution of the specialized forms of proteasomes involved in antigen presentation
- Source :
- Immunogenetics. 71:251-261
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
Abstract
- Proteasomes are a multi-subunit protease complex that produces peptides bound by major histocompatibility complex (MHC) class I molecules. Phylogenetic studies indicate that two specialized forms of proteasomes, immunoproteasomes and thymoproteasomes, and the proteasome activator PA28αβ emerged in a common ancestor of jawed vertebrates which acquired adaptive immunity based on the MHC, T cell receptors, and B cell receptors ~ 500 million years ago. Comparative genomics studies now provide strong evidence that the genes coding for the immunoproteasome subunits emerged by genome-wide duplication. On the other hand, the gene encoding the thymoproteasome subunit β5t emerged by tandem duplication from the gene coding for the β5 subunit. Strikingly, birds lack immunoproteasomes, thymoproteasomes, and the proteasome activator PA28αβ, raising an interesting question of whether they have evolved any compensatory mechanisms.
- Subjects :
- 0301 basic medicine
Proteasome Endopeptidase Complex
T-Lymphocytes
Protein subunit
Immunology
Antigen presentation
Receptors, Antigen, T-Cell
Adaptive Immunity
Major histocompatibility complex
Article
Evolution, Molecular
03 medical and health sciences
0302 clinical medicine
Gene duplication
Genetics
Animals
Humans
Gene
Antigen Presentation
biology
Histocompatibility Antigens Class I
T-cell receptor
Acquired immune system
030104 developmental biology
Proteasome
biology.protein
030215 immunology
Subjects
Details
- ISSN :
- 14321211 and 00937711
- Volume :
- 71
- Database :
- OpenAIRE
- Journal :
- Immunogenetics
- Accession number :
- edsair.doi.dedup.....3eb1945e4b142ea231c9e5afdd5c71db