Mitogen-activated Swiss Mouse 3T3 RSK Kinases I and II Are Related to Pp44mpk from Sea Star Oocytes and Participate in the Regulation of Pp90rsk Activity

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1991 Jun 1

PMID 2052581

Citations 29

Authors

J Chung

S L Pelech

J Blenis

Affiliations

Soon will be listed here.

Abstract

Using a recombinant rsk gene product as a substrate for in vitro kinase assays, we have identified two mitogen-activated Swiss 3T3 RSK protein kinase activities (referred to as RSK kinase I and RSK kinase II, based on their order of elution from phenyl-Sepharose). Polyclonal antisera prepared against maturation-regulated 44-kDa myelin basic protein (MBP) kinase (pp44mpk) purified from sea star oocytes demonstrated immunocrossreactivity with polypeptides of approximately 44 kDa in the RSK kinase I preparation and approximately 42 kDa in the RSK kinase II preparation, respectively. These polypeptides were also recognized by anti-phosphotyrosine antibodies, and either phosphatase 1B or 2A (tyrosine- and serine/threonine-specific phosphatases, respectively) separately inactivated RSK phosphotransferase activity supporting the notion that tyrosine and serine/threonine phosphorylation are required for activity. In vitro, both RSK kinases and MBP kinase phosphorylated recombinant RSK and generated nearly identical two-dimensional tryptic phosphopeptide maps. They also phosphorylated MBP and microtubule-associated protein 2 but not 40S ribosomal protein S6. Furthermore, these protein kinases phosphorylated and partially activated pp90rsk in immune complexes obtained from quiescent cells.

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