title: Cloning of feline cDNA encoding the cytotoxic T lymphocyte-associated antigen 4 (CTLA-4).
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.
authors.affiliation: Laboratory of Veterinary Internal Medicine, Faculty of Agriculture, Yamaguchi University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ohno
authors.forename: M
authors.initials: M
authors.lastname: Fujiki
authors.forename: T S
authors.initials: TS
authors.lastname: Khatlani
authors.forename: H
authors.initials: H
authors.lastname: Inokuma
authors.forename: T
authors.initials: T
authors.lastname: Onishi
mesh_terms: D000069594:Abatacept; D020816:Amino Acid Motifs / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D015703:Antigens, CD; D000943:Antigens, Differentiation / Q000737:chemistry / Q000235:genetics* / Q000502:physiology; D001483:Base Sequence; D060908:CTLA-4 Antigen; D002415:Cats / Q000235:genetics* / Q000276:immunology; D003001:Cloning, Molecular; D004247:DNA / Q000737:chemistry; D017931:DNA Primers / Q000737:chemistry; D018076:DNA, Complementary / Q000737:chemistry* / Q000235:genetics; D018796:Immunoconjugates; D008969:Molecular Sequence Data; D012313:RNA / Q000737:chemistry / Q000302:isolation & purification; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D060908:CTLA-4 Antigen; C556706:CTLA4 protein, human; D017931:DNA Primers; D018076:DNA, Complementary; D018796:Immunoconjugates; D012313:RNA; D000069594:Abatacept; D004247:DNA