Negative regulation of MEKK1-induced signaling by glutathione S-transferase Mu

Kanghyun Ryoo, Sung Ho Huh, Hee Lee Yong, Wan Yoon Kyoung, Ssang Goo Cho, Eui Ju Choi

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


Mitogen-activated protein kinase/extracellular signal-regulated kinase kinase kinase 1 (MEKK1) is an important component in the stress-activated protein kinase pathway. Glutathione S-transferase Mu 1-1 (GST M1-1) has now been shown to inhibit the stimulation of MEKK1 activity induced by cellular stresses such as UV and hydrogen peroxide. GST M1-1 inhibited MEKK1 activation in a manner independent of its glutathione-conjugating catalytic activity. In vitro binding and kinase assays revealed that GST M1-1 directly bound MEKK1 and inhibited its kinase activity. Co-immunoprecipitation analysis showed a physical association between endogenous GST M1-1 and endogenous MEKK1 in L929 cells. Overexpressed GST M1-1 interfered with the binding of MEKK1 to SEK1 in transfected HEK293 cells. Furthermore, GST M1-1 suppressed MEKK1-mediated apoptosis. Taken together, our results suggest that GST M1-1 functions as a negative regulator of MEKK1.

Original languageEnglish
Pages (from-to)43589-43594
Number of pages6
JournalJournal of Biological Chemistry
Issue number42
Publication statusPublished - 2004 Oct 15

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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