JBC Transcription and Nuclear Factor Monoclonals

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J Biol Chem, Vol. 274, Issue 2, 1026-1032, January 8, 1999

Cloning and Characterization of RLPK, a Novel RSK-related Protein Kinase

Liguo New, Ming Zhao, Yingqiu Li, William W. Bassett, Yue FengDagger , Stephen Ludwig§, Franco D. Padova, Hermann Gram, and Jiahuai Han

From the Department of Immunology, The Scripps Research Institute, La Jolla, California 92037, the Dagger  Department of Biochemistry, Emory University, Atlanta, Georgia 30322, the § Institut für Medizinische Strahlenkunde und Zellforschung, D-97078 Würzburg, Germany, and the  Novartis Pharma AG, CH-4002 Basel, Switzerland

A novel protein kinase whose activity can be stimulated by mitogen in vivo was cloned and characterized. The cDNA of this gene encodes an 802-amino acid protein (termed RLPK) with the highest homology (37% identity) to the two protein kinase families, p90RSK and p70RSK. Like p90RSR, but not p70RSK, RLPK also contains two complete nonidentical protein kinase domains. RLPK mRNA is widely expressed in all human tissues examined and is enriched in the brain, heart, and placenta. In HeLa cells, transiently expressed epitope-tagged RLPK can be strongly induced by epidermal growth factor, serum, and phorbol 12-myristate 13-acetate, but only moderately up-regulated by tumor necrosis factor-alpha and other stress-related stimuli. The activity of RLPK stimulated by epidermal growth factor was not inhibited by several known protein kinase C inhibitors nor by rapamycin, a known specific inhibitor for p70RSK, but could be inhibited by herbimycin A, a tyrosine kinase inhibitor, and partially inhibited by PD98059 or SB203580, inhibitors for the mitogen-activated protein kinase pathways. Recombinant RLPK possesses high phosphorylation activity toward histone 2B and the S6 peptide, RRRLSSLRA. Although purified recombinant RLPK can be phosphorylated by ERK2 and p38alpha in vitro, its activity is not affected by this phosphorylation. Moreover, the treatment of RLPK with acid phosphatase did not reduce its in vitro kinase activity. These data suggest that RLPK is structurally similar to previously isolated RSKs, but its regulatory mechanism may be distinct from either p70RSK or p90RSKs.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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