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Related Experiment Video

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Assessing Spatial Learning and Memory in Small Squamate Reptiles
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Kibra Modulates Learning and Memory via Binding to Dendrin.

Zeyang Ji1, Hao Li2, Zhou Yang1

  • 1Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Cell Reports
|February 21, 2019
PubMed
Summary
This summary is machine-generated.

Kibra protein regulates learning and memory by binding to Dendrin. Blocking this interaction impairs synaptic transmission, memory, and is linked to Tourette syndrome, revealing a novel therapeutic target.

Keywords:
DendrinKibraTourette syndromeWW domainslearning and memorypsychiatric disorderscaffold proteinsynaptic complexsynaptic transmissiontandem repeats

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Kibra (WWC1 gene) is a synaptic scaffold protein crucial for learning and memory.
  • Dysregulation of Kibra is implicated in neurological disorders like Alzheimer's and Tourette syndrome.
  • The precise molecular mechanisms of Kibra's neuronal function remain largely unknown.

Purpose of the Study:

  • To elucidate the molecular mechanism of Kibra's function in neurons.
  • To identify binding partners of Kibra and characterize their interaction.
  • To investigate the role of the Kibra-Dendrin interaction in synaptic plasticity and memory.

Main Methods:

  • Co-immunoprecipitation and surface plasmon resonance to confirm Kibra-Dendrin binding.
  • Structural analysis of Kibra WW12 domains complexed with Dendrin.
  • Development of a peptide inhibitor targeting the Kibra-Dendrin interaction.
  • Electrophysiological recordings and behavioral tests in animal models.

Main Results:

  • Kibra directly binds to the postsynaptic density protein Dendrin via its WW12 domains with high affinity (nanomolar Kd).
  • A novel peptide inhibitor specifically disrupted the Kibra-Dendrin interaction in neurons.
  • Inhibition of Kibra-Dendrin binding led to reduced excitatory synaptic transmission, blocked long-term potentiation, and impaired spatial learning and memory.
  • A Tourette syndrome-associated Kibra mutation impaired its binding to Dendrin.

Conclusions:

  • Kibra modulates synaptic transmission and spatial memory through its interaction with Dendrin.
  • The Kibra-Dendrin complex represents a critical molecular target for neurological disorders.
  • Targeting the Kibra-Dendrin interaction offers a potential therapeutic strategy for cognitive and memory deficits.