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Molecular and Cellular Biology, July 2003, p. 4796-4804, Vol. 23, No. 14
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.14.4796-4804.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Phosphorylation of p90 Ribosomal S6 Kinase (RSK) Regulates Extracellular Signal-Regulated Kinase Docking and RSK Activity

Philippe P. Roux, Stephanie A. Richards, and John Blenis*

Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115

Received 28 January 2003/ Returned for modification 5 March 2003/ Accepted 21 April 2003

Stimulation of the Ras/extracellular signal-regulated kinase (ERK) pathway can modulate cell growth, proliferation, survival, and motility. The p90 ribosomal S6 kinases (RSKs) comprise a family of serine/threonine kinases that lie at the terminus of the ERK pathway. Efficient RSK activation by ERK requires its interaction through a docking site located near the C terminus of RSK, but the regulation of this interaction remains unknown. In this report we show that RSK1 and ERK1/2 form a complex in quiescent HEK293 cells that transiently dissociates upon mitogen stimulation. Complex dissociation requires phosphorylation of RSK1 serine 749, which is a mitogen-regulated phosphorylation site located near the ERK docking site. Using recombinant RSK1 proteins, we find that serine 749 is phosphorylated by the N-terminal kinase domain of RSK1 in vitro, suggesting that ERK1/2 dissociation is mediated through RSK1 autophosphorylation of this residue. Consistent with this hypothesis, we find that inactivating mutations in the RSK1 kinase domains disrupted the mitogen-regulated dissociation of ERK1/2 in vivo. Analysis of different RSK isoforms revealed that RSK1 and RSK2 readily dissociate from ERK1/2 following mitogen stimulation but that RSK3 remains associated with active ERK1/2. RSK activity assays revealed that RSK3 also remains active longer than RSK1 and RSK2, suggesting that prolonged ERK association increased the duration of RSK3 activation. These results provide new evidence for the regulated nature of ERK docking interactions and reveal important differences among the closely related RSK family members.

* Corresponding author. Mailing address: Department of Cell Biology, Harvard Medical School, 240 Longwood Ave., Boston, MA 02115. Phone: (617) 432-4848. Fax: (617) 432-1144. E-mail: jblenis{at}hms.harvard.edu.

Molecular and Cellular Biology, July 2003, p. 4796-4804, Vol. 23, No. 14
0022-538X/03/$08.00+0     DOI: 10.1128/MCB.23.14.4796-4804.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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