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Dishevelled localization and function are differentially regulated by structurally distinct sterols.

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Intracellular sterols regulate Dishevelled (DVL) protein activity by altering its membrane association and interactions. Sterol accumulation impairs DVL2 function, highlighting the importance of sterol homeostasis in cell signaling.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Dishevelled (DVL) proteins are crucial for cell signaling pathways like Wnt/β-catenin, regulating development and disease.
  • DVL proteins associate with the plasma membrane via cholesterol binding, but the specifics of this interaction and its consequences are not fully understood.

Purpose of the Study:

  • To investigate the structural requirements and cellular impacts of Dishevelled (DVL)-sterol association.
  • To determine how intracellular sterol accumulation affects DVL activity and signaling.

Main Methods:

  • In silico and molecular analyses of DVL-sterol binding.
  • Assessment of DVL2 plasma membrane association and nuclear localization in response to sterol changes.
  • Evaluation of DVL2 protein-protein interactions under altered sterol conditions.

Main Results:

  • Intracellular sterol accumulation leads to aberrant DVL activity.
  • Sterol orientation within the DVL-PDZ domain influences DVL-sterol binding.
  • Accumulated sterols impair DVL2 membrane association, promoting its nuclear localization via Foxk2.
  • Altered intracellular sterols selectively disrupt DVL2 protein-protein interactions.

Conclusions:

  • Sterol specificity is a key regulator of DVL signaling.
  • Intracellular sterols exert distinct effects on DVL activity.
  • Maintaining intracellular sterol homeostasis is critical for proper cell signaling.