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Localization of 5'-Nucleotidase and Its Possible Significance in Some of the Imaginal Disks of Calliphora Erythrocephala

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

1. In the imaginal disks two dephosphorylating enzymes can be demonstrated. Firstly a 5'-nucleotidase, which splits AMP, dAMP and ATP; and secondly an enzyme which splits β-Glyc.-P., probably a non-specific acid phosphatase. 2. The localization of 5'-nucleotidase in the imaginal disks of third instar larvae and prepupae is very characteristic. The enzyme activity can first be demonstrated in early third instar larvae. This means that a chemo-differentiation already takes place shortly after the second moult. 3. The localization of the enzyme does not fit in with the postulated relationship between 5'-nucleotidase and the determination of adult structures. 4. An alternative hypothesis, suggesting a role of 5'-nucleotidase in the contraction of the cell membrane, agrees with the localization of the enzyme in the different cell types of the disks. According to this hypothesis the positive areas in the disk epithelium have a "skeleton"function.

Affiliations: 1: ( Zoological Laboratory, University of Leiden, The Netherlands


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