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The interaction between PSD-95 and Ca2+/calmodulin is enhanced by PDZ-binding proteins.
Yuko Fukunaga1, Mamoru Matsubara, Rina Nagai
1Membrane Dynamics Project, RIKEN Harima Institute, Mikazuki, Sayo, Hyogo.
Journal of Biochemistry
|August 11, 2005
Summary
This study reveals how the postsynaptic density-95 (PSD-95) protein interacts with calmodulin, identifying the HOOK region
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Postsynaptic density-95 (PSD-95) is a crucial scaffolding protein in neuronal synapses.
- Calmodulin is a calcium-binding protein involved in numerous cellular processes.
- Understanding PSD-95 and calmodulin interaction is key to synaptic function.
Purpose of the Study:
- To characterize the binding interaction between PSD-95 and calmodulin.
- To identify the specific regions of PSD-95 involved in calmodulin binding.
- To investigate how other interacting proteins influence this binding.
Main Methods:
- Surface plasmon resonance (SPR) spectroscopy was employed.
- PSD-95 was immobilized on a sensor chip for binding assays.
- SPR was used to measure binding kinetics and affinity.
Main Results:
- Calmodulin binding to PSD-95 was directly characterized.
- Soluble calmodulin inhibited the binding of PSD-95 to immobilized calmodulin.
- The HOOK region of PSD-95 was identified as critical for calmodulin interaction.
- Ligands binding to PSD-95's PDZ domain, like CRIPT and NR2B peptides, enhanced PSD-95 affinity for calmodulin.
Conclusions:
- The HOOK region of PSD-95 is essential for calmodulin binding.
- Ligand binding to PSD-95's PDZ domains modulates its interaction with calmodulin.
- Conformational changes in PSD-95 upon ligand binding likely influence calmodulin interaction, impacting synaptic signaling.