期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 19, 页码 7951-7956出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0902728106
关键词
major histocompatibility complex; specificity; T cell
资金
- US Public Health Service [AI-17134, AI-18785, AI-22295, AI-07405]
We have hypothesized that in the prenegative selection TCR repertoire, many somatically generated complementary-determining region (CDR) 3 loops combine with evolutionarily selected germline V alpha/V beta CDR1/CDR2 loops to create highly MHC/peptide cross-reactive T cells that are subsequently deleted by negative selection. Here, we present a mutational analysis of the V beta CDR3 of such a cross-reactive T-cell receptor (TCR), YAe62. Most YAe62 TCRs with the mutant CDR3s became less MHC promiscuous. However, others with CDR3s unrelated in sequence to the original recognized even more MHC alleles than the original TCR. Most importantly, this recognition was still dependent on the conserved CDR1/CDR2 residues. These results bolster the idea that germline TCR V elements are inherently reactive to MHC but that this reactivity is fine-tuned by the somatically generated CDR3 loops.
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