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Related Experiment Video

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LDL Cholesterol Uptake Assay Using Live Cell Imaging Analysis with Cell Health Monitoring

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Death Receptor 5 Networks Require Membrane Cholesterol for Proper Structure and Function.

Andrew K Lewis¹, Christopher C Valley¹, Stephen L Peery¹

¹Department of Biomedical Engineering, University of Minnesota, Twin Cities, Minneapolis, MN 55455, USA.

Journal of Molecular Biology

|October 11, 2016

Summary

This summary is machine-generated.

Cholesterol is essential for Death Receptor 5 (DR5) network formation and activity, enabling covalent dimerization for apoptosis induction. Cholesterol depletion prevents active DR5 clustering, highlighting its crucial role in cell death signaling.

Keywords:

cholesterol-rich membrane domains disulfide bond ligand/receptor clustering replica exchange molecular dynamics transmembrane domain

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Area of Science:

Cell biology
Biophysics
Molecular signaling

Background:

Death receptor 5 (DR5) triggers apoptosis and is linked to membrane cholesterol.
DR5 forms ligand-induced clusters, previously assumed to be in cholesterol-rich domains.
Recent findings indicate DR5 clusters are structured networks stabilized by receptor dimers.

Purpose of the Study:

To investigate the role of membrane cholesterol in DR5 network formation and activity.
To determine if the membrane actively drives DR5 dimerization and network assembly.
To elucidate the relationship between DR5 network structure, dimerization, cholesterol, and apoptosis.

Main Methods:

Cellular cholesterol depletion experiments.
Analysis of DR5 network formation and caspase cleavage.
Molecular simulations of DR5 transmembrane dimers.
Experiments in synthetic lipid bilayers.

Main Results:

Cholesterol depletion did not inhibit DR5 network formation but abolished caspase cleavage.
Cholesterol is necessary for the covalent dimerization of DR5 transmembrane domains.
Molecular simulations and synthetic vesicle experiments showed cholesterol facilitates DR5 dimerization via increased helicity in thicker bilayers.

Conclusions:

Membrane cholesterol is critical for the formation of *active* DR5 networks, not just network assembly.
Cholesterol facilitates DR5 transmembrane helix dimerization, a key step for apoptosis.
The membrane's physical properties, influenced by cholesterol, actively regulate DR5 signaling pathways.