Nature Cell Biology
- 8, 863 - 869 (2006)
Published online: 16 July 2006; | doi:10.1038/ncb1447
Negative regulation of ERK activity by VRK3-mediated activation of VHR phosphatase
Tae-Hong Kang & Kyong-Tai Kim
Department of Life Science, Biotechnology Research Center, Division of Molecular and Life Science, Pohang University of Science and Technology (POSTECH), San-31, Hyoja-Dong, Pohang, 790-784, Republic of Korea.
Correspondence should be addressed to Kyong-Tai Kim ktk@postech.ac.kr
MKP1MKP2Extracellular signal regulated kinases (ERKs) represent a signalling hub in many physiological responses and have pivotal functions in cell proliferation, differentiation, development and death, as well as in synaptic plasticity1,
2. Mitogen-activated protein kinase phosphatases (MKPs) selectively inactivate ERKs by dephosphorylating critical phosphothreonine and phosphotyrosine residues3,
4. Transcriptional induction of MKP expression5,
6 and posttranscriptional stabilization of MKP mRNA7 are well-documented as negative-feedback mechanisms for ERK signalling. Vaccinia-related kinase 3 (VRK3) is a member of the novel VRK family8,
9, but its function has not been defined. Here, we show that VRK3 suppresses ERK activity through direct binding to one of the MKPs, vaccinia H1-related (VHR)10, which specifically dephosphorylates and inactivates ERK in the nucleus11. Notably, VRK3 enhances the phosphatase activity of VHR by a mechanism independent of its kinase activity. VRK3 is therefore a member of a new class of phosphatase-activating kinases that regulate the activity of ERK. Our findings show that direct interaction of VHR with VRK3 posttranslationally regulates ERK signalling.
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