Abstract
Although it is known that MEKK4 regulates MKK6, and p38 MAP kinase, extracellular stimuli that activate the serine/threonine kinase, MEKK4, are unknown. The aim of this study was then to identify stimuli that regulate MEKK4. By using recombinant MEKK4, as bait to attract interacting proteins, the calcium binding protein, annexin II, was identified by mass spectrometry as interacting with MEKK4, suggesting that MEKK4 might be regulated by calcium. A calcium-dependent interaction between MEKK4 and annexin II was observed when MEKK4 was immunoprecipitated from rat aortic smooth muscle cells that were treated with angiotensin II. Additional studies using recombinant MEKK4 in a Far-Western immunoblot identified a protein of 120 kDa as interacting directly with MEKK4. Prior studies indicated that MEKK4 was phosphorylated on tyrosine in vivo, and in fact, Pyk2 interacts with MEKK4 in an angiotensin II dependent manner in rat aortic smooth muscle cells. Pyk2 phosphorylates MEKK4 in vitro and Pyk2-dependent phosphorylation further regulates MEKK4-dependent phosphorylation of MKK6. Finally, dominant-negative MEKK4 inhibits angiotensin II mediated transcription of a luciferase reporter construct containing the cyclooxygenase II promoter, demonstrating that MEKK4 functions in a calcium-dependent manner as a substrate for Pyk2 and regulates transcription of cyclooxygenase II. (Mol Cell Biochem 271: 77–90, 2005)
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Abbreviations
- MAPK:
-
mitogen-activated protein kinase
- ERK:
-
extracellular-regulated protein kinase
- MEKK:
-
MAPK/ERK kinase kinase
- Pyk2:
-
proline-rich tyrosine kinase 2
- COX II:
-
cyclooxygenase II
- GST:
-
glutathione S-transferase
- PAGE:
-
polyacrylamide gel electrophoresis
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Derbyshire, Z.E., Halfter, U.M., Heimark, R.L. et al. Angiotensin II stimulated transcription of cyclooxygenase II is regulated by a novel kinase cascade involving Pyk2, MEKK4 and annexin II. Mol Cell Biochem 271, 77–90 (2005). https://doi.org/10.1007/s11010-005-5386-9
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DOI: https://doi.org/10.1007/s11010-005-5386-9