Abstract
We report the isolation and characterization of 19 classes of nonrearranging T cell-specific cDNA clones and two cDNA clones encoding the alpha and beta chains of the T-cell antigen receptor from a human T-cell line, Jurkat. Results indicate that the human alpha-chain gene, like its beta-chain counterpart, undergoes somatic rearrangement in T cells. In addition, it shows sequence homology to its beta-chain counterpart and immunoglobulin, indicating that the human alpha chain is also a member of the immunoglobulin supergene family. Sequence comparison suggests that the alpha chain also may be composed of variable (V), diversity (D), joining (J), and constant (C) region gene segments. The protein deduced from the cDNA sequence has a molecular weight of 29,995 and possesses six potential N-glycosylation sites. The availability of alpha- and beta-chain genes of the T-cell receptor from the same T-cell line provides tools to study their possible roles in recognition of antigens and major histocompatibility complex products by the human T-cell receptor.
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