title: Sequence analyses of feline B7 costimulatory molecules.
abstract: Using RT-PCR amplifications with mRNA from mitogen-stimulated feline peripheral blood mononuclear cells, cDNA of feline B7-1 (CD80) and B7-2 (CD86) were cloned. The cDNA were sequenced and putative translated protein sequences compared with known counterpart sequences. Hydrophilicity patterns of the feline CD80 and CD86 which were only 26.8% identical at the amino acid sequence were very distinct from each other, but similar to the putative human CD80 and CD86 proteins, respectively. The feline CD80 gene encoded a protein of 292 amino acids and the CD86 gene encoded a protein of 329 amino acids. Amino-terminal signal sequences, extracellular Ig V- and Ig C-like domains, transmembrane domains, and carboxyl cytoplasmic domains were identified in both molecules. Although the most conserved domain among the CD80 sequences was the Ig C-like domain, the most conserved domain among the CD86 sequences was the Ig V-like domain. Among the known sequences, the bovine CD80 and the porcine CD86 sequences available for comparisons were identified as most closely related to the feline CD80 (63.3%) and CD86 (67.5%), respectively. The mouse molecules were the least identical (43.6 and 43.6%, respectively) with the feline CD80 and CD86 proteins. The human CD80 and CD86 molecules were 56.3 and 57.0% identical with the feline molecules.
authors.affiliation: Department of Veterinary Pathobiology, Texas A&M University, College Station, TX 77843-4467, USA.
authors.forename: I S
authors.initials: IS
authors.lastname: Choi
authors.forename: S M
authors.initials: SM
authors.lastname: Hash
authors.forename: B J
authors.initials: BJ
authors.lastname: Winslow
authors.forename: E W
authors.initials: EW
authors.lastname: Collisson
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015703:Antigens, CD / Q000235:genetics*; D018122:B7-1 Antigen / Q000235:genetics*; D051940:B7-2 Antigen; D002415:Cats; D017931:DNA Primers / Q000737:chemistry; D018076:DNA, Complementary / Q000032:analysis; D006801:Humans; D008562:Membrane Glycoproteins / Q000235:genetics*; D008969:Molecular Sequence Data; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA / Q000662:veterinary*; D017386:Sequence Homology, Amino Acid
chemical_list: D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; C497964:CD86 protein, human; D017931:DNA Primers; D018076:DNA, Complementary; D008562:Membrane Glycoproteins