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The TAO of MEKK
T K Schlesinger1, G R Fanger, T Yujiri
1Program in Molecular Signal Transduction, Division of Basic Sciences, National Jewish Medical and Research Center, 1400 Jackson St. Denver, CO 80206, USA.
Frontiers in Bioscience : a Journal and Virtual Library
|November 20, 1998
Summary
MEKK1 and related proteins regulate ERK activation and MAPK pathways. These MEKK family members act as sensors, controlling cell responses to environmental stimuli and influencing survival versus apoptosis.
Area of Science:
- Cellular Biology
- Molecular Biology
- Signal Transduction
Background:
- Mitogen-activated protein kinase (MAPK) pathways are crucial for cellular responses.
- MEKK1, identified in 1993, revealed additional pathways regulating ERK activation beyond Raf.
- The MEKK family has expanded, increasing the diversity in MAPK pathway regulation.
Purpose of the Study:
- To explore the role of MEKK family members in sensing environmental stimuli.
- To understand the regulatory mechanisms of MEKKs, including protein interactions and localization.
- To elucidate the specific biological functions of MEKK1, MEKK2, MEKK3, and MEKK4.
Main Methods:
- Cloning and characterization of MEKK family members.
- Investigating regulation by extracellular stimuli, low molecular weight GTP-binding proteins (LMWG), phosphorylation, and subcellular localization.
- Utilizing homologous deletion to determine biological functions of MEKK family members.
Main Results:
- MEKK family members are regulated by diverse stimuli, including growth factors and DNA damage.
- MEKK1 plays a significant role in mediating cell survival versus apoptosis.
- MEKK1 influences transcription factors, death receptors, and their ligands.
Conclusions:
- MEKK family members function as localized sensors controlling cellular responses.
- These sensors impact gene expression, metabolism, and cytoskeleton organization.
- Further research, including homologous deletion studies, is essential to fully define the roles of MEKK2, MEKK3, and MEKK4.