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    DNA Seq. 1992;3(3):167-75.

    Molecular cloning of mouse alcohol dehydrogenase-B2 cDNA: nucleotide sequences of the class III ADH genes evolve slowly even for silent substitutions.

    Hur MW, Ho WH, Brown CJ, Goldman D, Edenberg HJ.

    Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis 46202-5122.

    We have cloned and sequenced a cDNA encoding the mouse class III alcohol dehydrogenase, Adh-B2. Adh-B2 mRNA is detectable in all the mouse tissues tested. Class III ADHs are highly conserved: the deduced amino acid sequence of the mouse Adh-B2 is 91 to 97% identical to the human, horse and rat liver enzymes. The mouse Adh-B2 cDNA is 87% identical in nucleotide sequence to the human chi-ADH cDNA. Previously, a slower rate of evolutionary divergence of the amino acid sequences of class III ADH proteins was detected and ascribed to functional constraints upon the protein. Our analysis of the nucleotide sequences demonstrates that this cannot be the entire explanation, since the rate of silent (synonymous) nucleotide substitutions is also lower in the class III ADHs than in the class I ADHs.

    PMID: 1472709 [PubMed - indexed for MEDLINE]

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