Characterization of a Drosophila cDNA clone that encodes a 252-amino acid non-muscle tropomyosin isoform.
We report here the isolation and DNA sequence of a cDNA clone encoding a 252-amino acid non-muscle or cytoskeletal tropomyosin (cTm) isoform from Drosophila. The Drosophila cTm shows considerable homology with vertebrate cTm throughout the middle portion of the molecule. The amino-terminal end of the molecule, however, shows less homology and contains five more amino acids than the equine platelet and human tropomyosins. There is also a proline at position 6 in the Drosophila protein. The carboxyl-terminal 27 amino acids also show little homology with vertebrate non-muscle tropomyosins. This is a region of the molecule that shows considerably diversity among other Drosophila tropomyosins and vertebrate tropomyosins. A comparison of the DNA sequence of the cTm cDNA and a previously reported muscle tropomyosin II cDNA sequence shows regions of identical DNA sequence alternating with regions of nonidentical sequence, suggesting that both mRNAs are produced by alternate splicing of the same gene.
Department of Biological Chemistry, University of Illinois College of Medicine, Chicago 60612.
P D
PD
Hanke
H M
HM
Lepinske
R V
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Storti
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D004247:DNA / Q000032:analysis*; D004330:Drosophila / Q000235:genetics*; D029721:Drosophila Proteins; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000032:analysis; D014335:Tropomyosin / Q000235:genetics*
D029721:Drosophila Proteins; D012333:RNA, Messenger; C490776:Tm1 protein, Drosophila; D014335:Tropomyosin; D004247:DNA