Enhanced phosphorylation and enzymatic activity of phosphoglucomutase by the Btk29A tyrosine kinase in Drosophila.
The Drosophila Btk29A tyrosine kinase is suggested to be involved in diverse processes, although its target proteins are unknown. In the present study, we investigated substrates of Btk29A tyrosine kinase by expressing a catalytically activated form of Btk29A-P1 (Btk-EG) in Drosophila compound eyes. Expression in eye disks led to the development of the rough-eye phenotype and increased tyrosine phosphorylation of a 65-kDa protein. Partial amino acid sequence analysis of this protein showed that it was phosphoglucomutase. Phosphoglucomutase activity in heads from Btk-EG-expressing flies was higher than that in controls, suggesting that the levels of tyrosine phosphorylation and activity of the enzyme are associated with Btk29A tyrosine kinase activity.
School of Human Sciences, Waseda University, Tokorozawa 359-1192, Japan. hiroko@human.waseda.ac.jp
Hiroko
H
Inoue
Shunzo
S
Kondo
Yoshimi
Y
Hinohara
Naoto
N
Juni
Daisuke
D
Yamamoto
D000818:Animals; D002118:Calcium / Q000378:metabolism; D002384:Catalysis; D004330:Drosophila / Q000201:enzymology* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D015151:Immunoblotting; D008855:Microscopy, Electron, Scanning; D010641:Phenotype; D010733:Phosphoglucomutase / Q000378:metabolism; D010766:Phosphorylation; D017956:Photoreceptor Cells, Invertebrate / Q000201:enzymology*; D011505:Protein-Tyrosine Kinases / Q000737:chemistry* / Q000378:metabolism*
D011505:Protein-Tyrosine Kinases; C474449:Btk29A protein, Drosophila; D010733:Phosphoglucomutase; D002118:Calcium