Abstract
We have cloned a member of the STE20/SPS1 protein kinase family from a transformed rat pancreatic beta cell line. SPAK (STE20/SPS1-related, proline alanine-rich kinase) belongs to the SPS1 subfamily of STE20 kinases and is highly conserved between species. SPAK is expressed ubiquitously, although preferentially in brain and pancreas. Biochemical characterization of SPAK catalytic activity demonstrates that is a serine/threonine kinase that can phosphorylate itself and an exogenous substrate in vitro. SPAK is immunoprecipitated from transfected mammalian cells as a complex with another, as yet uncharacterized, serine/threonine kinase which is capable of phosphorylating catalytically-inactive SPAK and myelin basic protein in an in vitro kinase assay. SPAK specifically activates the p38 pathway in cotransfection assays. Like MST1 and MST2, SPAK contains a putative caspase cleavage site at the junction of the catalytic domain and the C-terminal region. Full-length SPAK is expressed in the cytoplasm in transfected cells, while a mutant corresponding to caspase-cleaved SPAK is expressed predominantly in the nucleus. The similarity of SPAK to other SPS1 family members, its ability to activate the p38 pathway, in addition to its putative caspase cleavage site, provide evidence that SPAK may act as a novel mediator of stress-activated signals.
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Abbreviations
- MAP kinase:
-
mitogen activated protein kinase
- ERK:
-
extracellular signal-regulated kinase
- JNK:
-
c-Jun N terminal kinase
- MAPKK:
-
mitogen activated protein kinase kinase
- MAPKKK:
-
mitogen activated protein kinase kinase kinase
- PAK:
-
p21-activated kinase
- GCK:
-
germinal center kinase
- GCKR:
-
germinal center kinase-related
- GLK:
-
GCK-like kinase
- HPK1:
-
hematopoietic progenitor kinase 1
- NIK:
-
NCK-interacting kinase
- SOK-1:
-
STE20/ oxidant stress responsive kinase-1
- MST:
-
mammalian sterile 20-like
- LOK:
-
lymphocyte oriented kinase
- SPAK:
-
STE20/SPS1-related proline alanine-rich kinase
- RIN:
-
rat insulinoma
- BLAST:
-
basic local alignment search tool
- GFP:
-
green fluorescent protein
- PCR:
-
polymerase chain reaction
- GST:
-
glutathione S-transferase
- HA:
-
hemagglutinin
- FCS:
-
fetal calf serum
- IPTG:
-
isopropyl-B-D-thiogalactoside
- DTT:
-
dithiothreitol
- PMSF:
-
phenylmethylsulfonyl fluoride
- MBP:
-
myelin basic protein
- HRP:
-
horseradish peroxidase
- TBS:
-
tris-buffered saline
- PVDF:
-
polyvinylidene difluoride
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Acknowledgements
We thank Dr Donna Dorow for helpful discussions and for providing the epitope-tagged MAPK and pGEX–c-Jun expression constructs, Dr Steve Gerondakis for providing 12CA5 anti-HA antibodies and Helen Thomas for critical reading of the manuscript. This work was supported by The Angelo and Susan Alberti Program Grant from the Juvenile Diabetes Foundation.
The nucleotide sequences reported in this paper have been submitted to the GenBankTM/EBI Data Bank with accession numbers AF099988, AF099990 and AF099989 for mouse, rat and human SPAK, respectively.
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Johnston, A., Naselli, G., Gonez, L. et al. SPAK, a STE20/SPS1-related kinase that activates the p38 pathway. Oncogene 19, 4290–4297 (2000). https://doi.org/10.1038/sj.onc.1203784
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DOI: https://doi.org/10.1038/sj.onc.1203784
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