[Genetic independence of two forms of carbonic anhydrase from bovine erythrocytes].

The two major forms of bovine erythrocyte carbonic anhydrase have been designated as CI and CII because their high activity of the C type. Separation of both forms and isolation of CI from the ethanol chloroform extract of the hemolysate were obtained by either column chromatography on DEAE-cellulose DE 23 or on DEAE-sephadex A-50. But pure preparations of the CII form were only obtained from DEAE-sephadex A-50 which separated CII from a minor component CIv1. Comparative studies of the CI and CII forms and of the minor component CIv1 strongly suggest that CIv1 is a conformational variant of CI and CII are genetic variants differing at least in their primary structure by one Arg yields Gln substitution 56 residues from the N-acetylated terminus. Based on the large variability of the proportion of the two isozymes in heterozygous individuals, the modality of the inheritance of these enzymes is discussed.