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Molecular Endocrinology, Vol 7, 953-964, Copyright © 1993 by Endocrine Society
ARTICLES |
IJ Davis, TG Hazel, RH Chen, J Blenis and LF Lau
Department of Genetics, University of Illinois College of Medicine, Chicago 60612.
Nur77 represents a unique class within the steroid receptor superfamily since its synthesis is tightly regulated by extracellular signals and it is capable of potent transactivation activity in the absence of an exogenously added ligand. In this study, we sought to dissect the functional domains regulating the activities of Nur77 by deletion mapping. We demonstrate that whereas the transactivation activity of Nur77 resides in the amino-terminal domain, the carboxy-terminal domain regulates this activity. A short deletion from the carboxy terminus eliminates transactivation activity while a further deletion restores the activity. Deletion of the domain immediately carboxyl to the zinc fingers motif eliminates both DNA binding activity and nuclear localization, thus abolishing transactivation. Nur77 is posttranslationally modified predominantly by phosphorylation, which occurs primarily at the N-terminal domain. The growth-related kinase pp90rsk, but neither the pp44mapk nor the pp70s6k, can phosphorylate recombinant Nur77 in vitro. Furthermore, we have identified a site within the region required for sequence-specific DNA binding, Ser-354, that is phosphorylated by pp90rsk in vitro; this site is also phosphorylated in vivo. The possibility that phosphorylation might affect DNA binding is discussed.
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