Drosophila caspase transduces Shaggy/GSK-3beta kinase activity in neural precursor development.
Caspases are well known for their role in the execution of apoptotic programs, in which they cleave specific target proteins, leading to the elimination of cells, and for their role in cytokine maturation. In this study, we identified a novel substrate, which, through cleavage by caspases, can regulate Drosophila neural precursor development. Shaggy (Sgg)46 protein, an isoform encoded by the sgg gene and essential for the negative regulation of Wingless signaling, is cleaved by the Dark-dependent caspase. This cleavage converts it to an active kinase, which contributes to the formation of neural precursor (sensory organ precursor (SOP)) cells. Our evidence suggests that caspase regulation of the wingless pathway is not associated with apoptotic cell death. These results imply a novel role for caspases in modulating cell signaling pathways through substrate cleavage in neural precursor development.
Kanuka
Hirotaka
H
Department of Genetics, Graduate School of Pharmaceutical Sciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan.
Kuranaga
Erina
E
Takemoto
Kiwamu
K
Hiratou
Tetsuo
T
Okano
Hideyuki
H
Miura
Masayuki
M
D000818:Animals; D020169:Caspases / Q000378:metabolism*; D016923:Cell Death; D002454:Cell Differentiation; D029721:Drosophila Proteins / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000166:cytology* / Q000502:physiology*; D038362:Glycogen Synthase Kinase 3 / Q000378:metabolism*; D000071679:Glycogen Synthase Kinase 3 beta; D009474:Neurons / Q000166:cytology; D012679:Sense Organs / Q000166:cytology; D015398:Signal Transduction
D029721:Drosophila Proteins; D000071679:Glycogen Synthase Kinase 3 beta; C080335:Sgg protein, Drosophila; D038362:Glycogen Synthase Kinase 3; D020169:Caspases