Cloning of feline cDNA encoding the cytotoxic T lymphocyte-associated antigen 4 (CTLA-4) |
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| Authors: | Ohno K Fujiki M Khatlani T S Inokuma H Onishi T |
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| Institution: | Laboratory of Veterinary Internal Medicine, Faculty of Agriculture, Yamaguchi University, Japan. |
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| Abstract: | Cytotoxic T lymphocyte-associated antigen 4 (CTLA-4) is a CD28 homologue which down-modulate T cell responses rather than augment them. To investigate its biological role in feline immune system, we cloned and sequenced full-length feline CTLA-4 (fCTLA-4) cDNA by RT-PCR from pokeweed mitogen stimulated peripheral blood lymphocytes. The fCTLA-4 contains an open reading frame of 669 nucleotides, coding for a polypeptide of 223 amino acids. The predicted fCTLA-4 amino acids sequence shows the homology of 86.6%, 87.0%, and 76.2% with human, bovine, and murine molecules respectively. The hexapeptide motif (MYPPPY) within the extra-cellular domain of CTLA-4 molecule, which is believed to be responsible for interaction with the B7 family members, is completely conserved in all the species. |
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