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PKMζ-KIBRA interactions, molecular turnover, and memory.

Changchi Hsieh1, David A Cano2, Panayiotis Tsokas1,3,4

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Summary
This summary is machine-generated.

Persistent KIBRA-PKMζ oligomers maintain long-term memory by overcoming molecular turnover. Continuous formation of these molecular structures ensures memory consolidation despite the degradation of individual protein components.

Keywords:
PKM-zetaPKMzetaWWC1long-term potentiation (LTP)

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Structural Biology

Background:

  • Persistent interaction between KIBRA and PKMζ is vital for maintaining synaptic plasticity and long-term memory.
  • Molecular turnover of KIBRA and PKMζ poses a challenge to memory persistence beyond their individual lifespans.

Purpose of the Study:

  • To investigate the structural basis of KIBRA-PKMζ interaction and its role in overcoming molecular turnover for memory maintenance.
  • To elucidate how KIBRA-PKMζ oligomers facilitate continuous memory consolidation.

Main Methods:

  • Utilized AlphaFold 3 to predict the structures of KIBRA-PKMζ heterodimers and heterohexamers.
  • Examined the mechanism of action of KIBRA-PKMζ interaction inhibitors (K-ZAP and ζ-stat).
  • Assessed the impact of inhibitors on established late-LTP and long-term spatial memory.

Main Results:

  • Predicted structures revealed K-ZAP blocks heterodimer formation and ζ-stat prevents the assembly of larger oligomeric structures.
  • Both K-ZAP and ζ-stat disrupted 1-month-old spatial memory, indicating the importance of oligomer formation.
  • Continuous KIBRA-PKMζ oligomerization is essential for overcoming molecular turnover and sustaining memory.

Conclusions:

  • Continuous formation of KIBRA-PKMζ oligomers is a fundamental molecular mechanism for long-term memory persistence.
  • Structural insights into KIBRA-PKMζ interactions provide a basis for understanding memory consolidation and potential therapeutic targets.