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N-terminal PDZ domain is required for NHERF dimerization.
S Shenolikar1, C M Minkoff, D A Steplock
1Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC 27710, USA. sheno001@mc.duke.edu
FEBS Letters
|February 13, 2001
Summary
The study reveals that NHERF (NHERF) forms dimers, primarily through its PDZ-I domain. This dimerization is reversible and influenced by protein phosphorylation, suggesting a role in hormonal signaling.
Area of Science:
- Molecular biology
- Cell signaling
- Protein interactions
Background:
- NHERF (NHERF) is a 55 kDa protein with PDZ domains involved in signal transduction at the plasma membrane.
- It interacts with receptors and ion transporters, mediating cellular communication.
Purpose of the Study:
- To investigate the oligomeric state of NHERF and the mechanism of its dimerization.
- To explore the role of NHERF dimerization in cellular signaling pathways.
Main Methods:
- Gel filtration chromatography to assess protein size and oligomeric state.
- Biosensor assays to study time- and concentration-dependent dimerization kinetics.
- Analysis of NHERF fragments to identify dimerization interfaces.
- Cellular studies in PS120 cells to examine phosphorylation effects.
Main Results:
- Recombinant NHERF exhibited an apparent size of 150 kDa, reducing to 55 kDa under denaturing conditions, indicating dimer formation.
- Biosensor studies confirmed time- and concentration-dependent dimerization of NHERF.
- The N-terminal PDZ-I domain was identified as the principal mediator of NHERF dimerization.
- Reversible protein phosphorylation in PS120 cells modulated NHERF dimerization.
Conclusions:
- NHERF exists as a dimer, with dimerization mediated by the PDZ-I domain.
- NHERF dimerization is a dynamic process influenced by phosphorylation.
- NHERF dimers likely play a significant role in hormonal signal transduction pathways.