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Detection and characterization of some new basic proteins in chicken postsynaptic densities
Journal of Neurochemistry
|July 1, 1986
Summary
This study identifies key basic proteins in chicken brain postsynaptic density (PSD), revealing their composition and potential roles in neuronal function. Some PSD proteins are phosphorylated, but none bind calcium.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- The postsynaptic density (PSD) is crucial for synaptic transmission and plasticity.
- Understanding PSD protein composition is essential for elucidating neuronal function.
Purpose of the Study:
- To characterize the basic polypeptides of chicken brain PSD.
- To identify potential mitochondrial contaminants and phosphorylation sites within PSD proteins.
Main Methods:
- Synaptosomes were treated with Triton X-100 and purified using sucrose gradients.
- Nonequilibrium pH gradient-sodium dodecyl sulfate two-dimensional gel electrophoresis was employed.
- Protein phosphorylation was assessed using [gamma-32P]ATP.
Main Results:
- Four major basic proteins (76K, 58K, 40K, 24K) were identified in chicken brain PSD.
- Additional basic proteins (76K, 52K, 47K, 45K, 36K, 34K) were detected, with some distinguished from mitochondrial contaminants.
- Several PSD proteins, including a synapsin I-like protein (76K) and 58K, undergo endogenous phosphorylation.
Conclusions:
- Chicken brain PSD contains a significant proportion of basic proteins, some of which are distinct from mitochondrial contaminants.
- Specific PSD proteins are substrates for endogenous kinases, suggesting regulatory roles in synaptic function.
- No direct calcium binding was observed for the identified PSD basic proteins.