Document Detail

Arabidopsis MAPK phosphatase 2 (MKP2) positively regulates oxidative stress tolerance and inactivates the MPK3 and MPK6 MAPKs.
MedLine Citation:
PMID:  17586809     Owner:  NLM     Status:  MEDLINE    
Two closely related Arabidopsis mitogen-activated protein kinases (MAPKs), MPK3 and MPK6, are rapidly but transiently activated in plants exposed to ozone. Although the contribution of these MAPKs to control of redox stress has been examined extensively, it remains unclear whether the dual-specificity MKPs play an essential role in the regulation of these processes. To explore this question, specific knockdown of each of the five putative MKPs in Arabidopsis was performed, and the ozone sensitivity phenotype of each MKP-suppressed line was assessed. Silencing of only one previously uncharacterized MKP, designated AtMKP2, rendered the plants hypersensitive to oxidative stress. AtMKP2-suppressed plants displayed significantly prolonged MPK3 and MPK6 activation during ozone treatment, and recombinant AtMKP2 was able to dephosphorylate both phospho-MPK3 and phospho-MPK6 in vitro, providing direct evidence that AtMKP2 may target these oxidant-activated MAPKs. In addition, the in vitro phosphatase activity of AtMKP2 was enhanced by co-incubation with either recombinant MPK3 or MPK6. In AtMKP2:YFP-expressing plants, the fusion protein was localized predominantly in the nucleus, the same compartment into which ozone-activated MPK3 and MPK6 have previously been shown to be translocated. Taken together, these data suggest that AtMKP2, a novel MKP protein in Arabidopsis, acts upon MPK3 and -6, and serves as a positive regulator of the cellular response to oxidant challenge.
Jin Suk Lee; Brian E Ellis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-06-22
Journal Detail:
Title:  The Journal of biological chemistry     Volume:  282     ISSN:  0021-9258     ISO Abbreviation:  J. Biol. Chem.     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-08-20     Completed Date:  2007-10-11     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  2985121R     Medline TA:  J Biol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  25020-9     Citation Subset:  IM    
Michael Smith Laboratories, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
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MeSH Terms
Arabidopsis / enzymology*
Arabidopsis Proteins / metabolism,  physiology*
Dose-Response Relationship, Drug
Gene Expression Regulation, Enzymologic*
Gene Expression Regulation, Plant*
Gene Silencing
Glutathione Transferase / metabolism
Mitogen-Activated Protein Kinase Kinases / metabolism,  physiology*
Mitogen-Activated Protein Kinases / chemistry*,  metabolism,  physiology
Oxidative Stress
RNA Interference
Time Factors
Reg. No./Substance:
0/Arabidopsis Proteins; 10028-15-6/Ozone; EC Transferase; EC 2.7.1.-/AtMPK3 protein, Arabidopsis; EC 2.7.1.-/MPK6 protein, Arabidopsis; EC 2.7.10.-/MPK2 protein, Arabidopsis; EC Protein Kinases; EC Protein Kinase Kinases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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