Acquisition of insulin-dependent protein tyrosine kinase activity during Drosophila embryogenesis - PubMed (original) (raw)
. 1985 Dec 25;260(30):16072-5.
- PMID: 3934169
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Acquisition of insulin-dependent protein tyrosine kinase activity during Drosophila embryogenesis
L Petruzzelli et al. J Biol Chem. 1985.
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Abstract
We have previously reported (Petruzzelli, L., Herrera, R., Garcia, R., and Rosen, O. M. (1985) Cancer Cells 3, 115-121) that adult Drosophila melanogaster contain a specific, high-affinity insulin-binding protein. Insulin-dependent protein tyrosine kinase activity has now been identified in Drosophila. Activity first appears at 6-12 h of embryogenesis, increases during the 12-18-h period and falls to low levels in the adult. 125I-insulin was cross-linked specifically and with high affinity to a protein (Mr = 135,000) throughout embryogenesis and in the adult. However, during the 6-12- and 12-18-h periods of embryogenesis when insulin-dependent protein tyrosine kinase activity is expressed, another protein (Mr = 100,000) becomes cross-linked to 125I-insulin. Crosslinking to both proteins was competitively inhibited by the addition of 100 nM insulin. We conclude that the insulin-binding and insulin-dependent protein tyrosine kinase activities of the mammalian insulin receptor are conserved in Drosophila. However, the insulin-dependent protein tyrosine kinase activity of the receptor is detected only during specific times in embryogenesis.
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