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Structure and exon to protein domain relationships of the mouse carbonic anhydrase II gene.

Open AccessPublished:October 05, 1985DOI:https://doi.org/10.1016/S0021-9258(17)38996-2
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      We have isolated a cosmid clone containing the entire mouse (YBR strain) carbonic anhydrase (CA) II gene in 38 kilobase pairs of genomic DNA. The gene was found to be composed of seven exons and six introns. A TATA box (TATAAAA) and a possible CCAAT box (CCACT) have been located beginning 92 and 142 base pairs, respectively, upstream from the initiation codon ATG. When the regions encoded by exons and protein domains are examined, all but 1 of the 30 putative active site residues are encoded by four exons: exons 2 and 3 mainly code for hydrophilic residues and exons 4 and 6 mostly hydrophobic residues. Two intron splice positions, one between the codons for Glu-116 and Leu-117 and the other interrupting the codon for Gly-143, are located at the bottom of the active site cavity, and the former separates two of the three histidine residues forming ligands to the active site zinc ion. The other four splice sites map to the exterior of the molecule. Thus, except for the possible association of the 29 active site residues encoded by four exons, no obvious correspondence is seen between the regions coded by exons and the functional or secondary structural domains of the mouse CA II molecule. During this study, the possible basis for the two electrophoretic types, CA IIa and CA IIb, of inbred mouse strains was detected as a Gln/His interchange at position 38.

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