Receptor-dependent and Tyrosine Phosphatase-mediated Inhibition of GSK3 Regulates Cell Fate Choice

Overview

Journal Dev Cell

Publisher Cell Press

Specialties Cell Biology
Reproductive Medicine

Date 2002 Nov 1

PMID 12408804

Citations 30

Authors

Leung Kim

Adrian Harwood

Alan R Kimmel

Affiliations

Soon will be listed here.

Abstract

Asymmetric body axis formation is central to metazoan development. Dictyostelium establishes an anterior/posterior axis utilizing seven-transmembrane cAMP morphogen receptors (CARs) and GSK3-mediated signal transductions that has a parallel with metazoan Wnt/Frizzled-GSK3 pathways. In Dictyostelium, GSK3 promotes posterior cell patterning but inhibits anterior cell differentiation. Tyrosine kinase ZAK1 mediates GSK3 activation. We now show that CAR4 regulates a tyrosine phosphatase that inhibits GSK3 activity. We have also identified essential phosphotyrosines in GSK3, confirmed their role in activated/deactivated regulation and cell fate decisions, and relate them to the predicted 3D structure of GSK3beta. CARs differentially regulate GSK3 activity by selectively activating a tyrosine phosphatase or kinase for pattern formation. The findings may provide a comparative understanding of CAR-GSK3 and Wnt/Frizzled-GSK3 pathways.

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