Characterization of the gene for mp20: a Drosophila muscle protein that is not found in asynchronous oscillatory flight muscle

doi:10.1083/jcb.108.2.521

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Characterization of the gene for mp20: a Drosophila muscle protein that is not found in asynchronous oscillatory flight muscle

A Ayme-Southgate, P Lasko, C French and ML Pardue
Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

A Drosophila melanogaster gene encoding a muscle specific protein was isolated by differential screening with RNA from primary cultures of myotubes. The gene encodes a 20-kD protein, muscle protein 20 (mp20), that is not detected in the asynchronous oscillatory flight muscles, but is found in most, if not all, other muscles (the synchronous muscles). The sequence of the protein, deduced from the DNA, contains two regions of 12 amino acids with significant similarity to high- affinity calcium-binding sites of other proteins. This protein is easily extracted from the contractile apparatus and thus does not seem to be a tightly bound structural component. The gene (located in polytene region 49F 9-13) is unique in the D. melanogaster genome and yields two transcripts, 1.0 and 0.9 kb long. The levels of the two transcripts are regulated differently during development, yet the coding regions of the two transcripts are identical.
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