Abstract
Feline serum amyloid A (SAA) cDNA clone was isolated from a hepatic mRNA of a mixed-breed cat. The feline SAA cDNA clone contains 333 nucleotides and deduced amino acid sequence shows 87.4%, 73.9%, and 65.8% homology with dog, human and mouse SAA respectively. Relative to the human and mouse SAA proteins, an additional peptide of eight amino acids is specified in the feline cDNA clone. Recombinant feline SAA (rfSAA) was expressed at high levels using pGEX bacterial expression system. Cleavage from the fusion moiety, and purification using glutathione-sepharose yielded pure soluble form of rfSAA. Antibodies generated against rfSAA were specific for feline SAA and showed no cross-reactivity with human SAA. Furthermore, antibodies against human SAA did not react with feline SAA. These results indicate that antigenicity of feline SAA is totally different from human SAA.
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