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Genetics, Vol 123, 503-509, Copyright © 1989
INVESTIGATIONS |
Xanthine Dehydrogenase Is Transported to the Drosophila Eye
A. G. Reaume, S. H. Clark and A. Chovnick
Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut 06268
The rosy (ry) locus in Drosophila melanogaster codes for the enzyme xanthine dehydrogenase. Mutants that have no enzyme activity are characterized by a brownish eye color phenotype reflecting a deficiency in the red eye pigment. This report demonstrates that enzyme which is synthesized in some tissue other than the eye is transported and sequestered at the eye. Previous studies find that no leader sequence is associated with this molecule but a peroxisomal targeting sequence has been noted, and the enzyme has been localized to peroxisomes. This represents a rare example of an enzyme involved in intermediary metabolism being transported from one tissue to another and may also be the first example of a peroxisomal protein being secreted from a cell.
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