Sci. Signal., 22 July 2008
Cell Biology Phosphorylation Inside-Out
L. Bryan Ray
Science, Science Signaling, AAAS, Washington, DC 20005, USA
A signaling pathway called the Hippo pathway has important roles in the control of tissue organization in development and in the regulation of organ size in the fruit fly. Hippo is a protein kinase that appears to pass signals from atypical cadherin molecules Fat and Dachsous at the cell surface to another intracellular kinase, Warts, which then regulates a transcriptional coactivator. Another protein somewhat distantly related to the protein kinases, Four-jointed, has also been implicated genetically in the pathway. Ishikawa et al. provide evidence that Four-jointed, which is localized to the Golgi complex, is indeed a kinase and that it appears to phosphorylate the cadherin domains of Fat and Dachsous, which will become extracellular domains at the cell surface.
Citation: L. B. Ray, Phosphorylation Inside-Out. Sci. Signal. 1, ec265 (2008).
The editors suggest the following Related Resources on Science sites:
In Science Signaling
Science Signaling. ISSN 1937-9145 (online), 1945-0877 (print). Pre-2008: Science's STKE. ISSN 1525-8882