How CBP/Shank3 Guards Rap and H-Ras

Area of Science:

• Neuroscience
• Structural Biology
• Molecular Biology

Background:

• Shank3 is a key postsynaptic density protein crucial for synaptic function.
• Small G proteins like Rap1 and H-Ras are involved in intracellular signaling pathways.
• Understanding protein-protein interactions at the synapse is vital for neuroscience research.

Purpose of the Study:

• To elucidate the structural basis of Shank3 interaction with Rap1 and H-Ras.
• To investigate the functional implications of these interactions in synaptic plasticity.

Main Methods:

• X-ray crystallography was used to determine the complex structures of Shank3 with Rap1 and H-Ras.
• Biochemical and functional assays were performed to assess the impact of these interactions.

Main Results:

• The crystal structures reveal specific binding interfaces between Shank3 and the small G proteins Rap1 and H-Ras.
• Functional data indicate that the binding affinity of Rap1 and H-Ras to Shank3 is modulated by synaptic plasticity.

Conclusions:

• The structural and functional data provide novel insights into the molecular mechanisms of Shank3 in synaptic regulation.
• These findings contribute to understanding how synaptic plasticity is controlled at the molecular level.