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  • Title: The human OX40 homolog: cDNA structure, expression and chromosomal assignment of the ACT35 antigen.
    Author: Latza U, Dürkop H, Schnittger S, Ringeling J, Eitelbach F, Hummel M, Fonatsch C, Stein H.
    Journal: Eur J Immunol; 1994 Mar; 24(3):677-83. PubMed ID: 7510240.
    Abstract:
    Tissue distribution and expression on mitogen and virally stimulated lymphocytes render the ACT35 molecule a human lymphocyte activation antigen which as yet could not be clustered. Expression cloning of the ACT35 antigen from a pCDM8 library of the HUT-102 cell line revealed strong homology of the cDNA and its encoded protein sequence with the formerly described rat OX40 antigen. The 1.4-kb nucleotide sequence and the deduced 277-amino acid sequence of the single transmembrane protein were 65% and 63% identical, in human and in rat, respectively. Conservation included one N-linked glycosylation site and one protein kinase C phosphorylation site. When expressed in COS-1 cells, the cDNA presented properties comparable to the native ACT35 antigen and the rat OX40 molecule (relative molecular mass 48,000). Thus, the ACT35 protein corresponds to the hitherto unknown human OX40 antigen and is, therefore, another member of the tumor necrosis factor/nerve growth factor receptor (TNFR/NGFR) family. After applying fluorescence in situ hybridization, the human ACT35/OX40 gene could be mapped to chromosome band 1p36 and is, thus, linked to the genes for TNFR II and CD30.
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