T cell receptor gene usage in the response to lambda repressor cI protein. An apparent bias in the usage of a V alpha gene element.
The T cell response to the lambda repressor cI protein is directed to the same region of the protein (residues 12-26) in both BALB/c and A/J mice. A panel of T cell hybridomas specific for P12-26 in the context of either I-Ek or I-Ad have been isolated To further understand the molecular interaction between the TCR and the Ia-P12-26 complex, the primary structures of the TCR of five T cell hybridomas have been determined. Southern and Northern analyses indicate that two members of the V alpha 3 gene family are used by 13 out of 14 I-Ek-restricted T cells. Four different V beta genes are used by these T cell hybridomas, while the majority (8 out of 13) express V beta 1 in combination with the J beta 2.1 element. No clear correlation can be seen in this system between gene usage and MHC restriction. In addition, the fine specificity of I-Ek-restricted T cells to a single amino acid substitution [Phe22/His22]P12-26 is not attributed to the usage of particular V alpha and V beta elements. The V alpha 3 family gene is also used by a few I-Ad-restricted T cells. Interestingly, these I-Ad T cells share a reactivity pattern more similar to that of I-Ek-restricted T cells than other I-Ad-restricted T cells. The nonrandom selection V alpha 3 is also demonstrated by the fact that V alpha 3 is used by P12-26-specific, but not by cytochrome c- or staphylococcal nucleus-specific, I-Ek-restricted T cells. This suggests that although antigen specificity may not be accounted for by either chain of the TCR, the members of V alpha 3 genes may be selected by the antigen (P12-26).
Lai
M Z
MZ
Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.
Huang
S Y
SY
Briner
T J
TJ
Guillet
J G
JG
Smith
J A
JA
Gefter
M L
ML
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015139:Blotting, Southern; D004268:DNA-Binding Proteins; D005786:Gene Expression Regulation; D005796:Genes; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006825:Hybridomas; D051379:Mice; D008969:Molecular Sequence Data; D005810:Multigene Family; D009842:Oligopeptides / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000235:genetics* / Q000276:immunology; D016693:Receptors, Antigen, T-Cell, alpha-beta; D012097:Repressor Proteins / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*; D014157:Transcription Factors / Q000276:immunology*; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins
D004268:DNA-Binding Proteins; D000949:Histocompatibility Antigens Class II; D009842:Oligopeptides; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; D012097:Repressor Proteins; D014157:Transcription Factors; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins; C016649:phage repressor proteins