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. 1988 Jul;85(14):5190–5194. doi: 10.1073/pnas.85.14.5190

The CD4 receptor is complexed in detergent lysates to a protein-tyrosine kinase (pp58) from human T lymphocytes.

C E Rudd 1, J M Trevillyan 1, J D Dasgupta 1, L L Wong 1, S F Schlossman 1
PMCID: PMC281714  PMID: 2455897

Abstract

The CD4 (T4) antigen is a cell-surface glycoprotein that is expressed predominantly on the surface of helper T cells and has been implicated in the regulation of T-cell activation and in the associative recognition of class II antigens of the major histocompatibility complex. In addition, the CD4 antigen appears to serve as a receptor for the human immunodeficiency virus (HIV). An important question has been whether the CD4 receptor is linked to an intracellular mediator that could regulate the activation of the CD4+ subset. In this paper, we provide preliminary evidence that the CD4 receptor is complexed in detergent lysates to a protein-tyrosine kinase (PTK) of 55-60 kDa, which is expressed specifically in T cells. The PTK is the human analogue of the murine pp56LSTRA (pp56lck) and has significant homology with c-src, c-yes, and other members of the src family. The identification of the PTK associated with CD4 receptor was made by use of an antiserum to a synthetic peptide that was deduced from the DNA sequence of PTK. Two-dimensional nonequilibrium pH gradient gel electrophoresis/NaDodSO4/PAGE revealed the kinase to focus as a heterogeneous collection of spots in the pH range of 4.0-5.0. Furthermore, in vitro phosphorylation revealed the phosphorylation of two additional polypeptides at 40 and 80 kDa, in addition to the autophosphorylation of the PTK at 55-60 kDa. The potential importance of the association between the CD4 receptor and the PTK of T cells is discussed in relation to T-cell activation and HIV infectivity.

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Selected References

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