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cDNA molecules encoding rabbit IgA alpha-heavy chains have been synthesized and six of these have been characterized. The complete nucleotide sequence of one cDNA, p 19 (942bp), showed that it encoded all but the N-terminal 57 amino acid residues of the constant region of alpha-chains. The cDNA molecules were subcloned into the expression vector pUC8 and E. coli were transformed. Radioimmunoassay of the molecules synthesized by these clones showed that all six cDNA molecules encoded alpha-chains of the IgA-g subclass. Comparison of the amino acids encoded by the alpha-cDNA with the amino acid sequence of mouse and human alpha-chains showed that although all of the intradomain disulfide bonds appear to be conserved, some positions, probably involved in interchain disulfide bonds, are not conserved. We propose that secretory component is covalently bound to cysteine 299 and/or cysteine 301 of the CH2 domain of mouse and human alpha-chains. The results from Southern blot analysis of genomic DNA with 32P-cDNA suggests that the rabbit genome has multiple C alpha genes.

Genes encoding α-heavy chains of rabbit IgA: characterization of cDNA encoding IgA-g subclass α-chains