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J. Biol. Chem., Vol. 262, Issue 26, 12397-12400, Sep, 1987
RL Sabina, R Marquetant, NM Desai, K Kaletha and EW Holmes
Myoadenylate deaminase is the muscle-specific isoform of AMP deaminase (EC 3.5.4.6), an enzyme which plays a special role in energy metabolism in skeletal muscle. A 2.3-kilobase cDNA encoding this enzyme has been cloned from a lambda gt10 library prepared from rat skeletal muscle using oligonucleotide probes designed from AMP deaminase peptide sequences. This cDNA was sequenced, and the amino acid sequence of this isoform of AMP deaminase was deduced. Sequences homologous to this cDNA are identified in the genome of eukaryotes as diverse as yeast and man. Tissue-specific expression of a 2.5-kilobase AMP deaminase transcript is demonstrated, and the abundance of this transcript as well as the 80- kDa adult, muscle-specific peptide of AMP deaminase increase in parallel during postnatal skeletal muscle development. In the adult animal, the abundance of this transcript and AMP deaminase activity are differentially expressed in various skeletal muscle fiber types. We conclude that AMP deaminase sequences have been highly conserved during evolution, and in mammals there is developmental and tissue-specific control of expression of this gene.
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