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Cholesterol: Significance and Regulation01:29

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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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Cholesterol in GPCR Structures: Prevalence and Relevance.

Parijat Sarkar1, Amitabha Chattopadhyay2

  • 1CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad, 500 007, India.

The Journal of Membrane Biology
|August 8, 2021
PubMed
Summary

Bound cholesterol molecules are key features of G protein-coupled receptor (GPCR) structures. This commentary examines their widespread occurrence and biological significance in GPCRs.

Keywords:
Bound cholesterolCholesterol sensitivityCryo-EMCrystal structureGPCRs

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Pharmacology

Background:

  • G protein-coupled receptors (GPCRs) are crucial membrane proteins involved in cellular signaling.
  • Cholesterol is a vital lipid component of cell membranes, influencing protein structure and function.
  • Emerging evidence suggests specific cholesterol binding sites on GPCRs.

Purpose of the Study:

  • To analyze the statistical prevalence of bound cholesterol in GPCR structures.
  • To evaluate the biological relevance and functional implications of cholesterol-GPCR interactions.
  • To highlight cholesterol as a significant structural hallmark of GPCRs.

Main Methods:

  • Bioinformatic analysis of publicly available GPCR crystal structures.
  • Statistical assessment of cholesterol molecule occupancy in GPCR binding pockets.
  • Literature review on functional studies implicating cholesterol in GPCR activity.

Main Results:

  • Cholesterol molecules are frequently observed in diverse GPCR structures.
  • Specific conserved cholesterol-binding sites are identified across different GPCR families.
  • Analysis indicates a statistical prevalence suggesting functional importance beyond simple lipid packing.

Conclusions:

  • Bound cholesterol is a recurring and significant feature of GPCR structural biology.
  • Cholesterol binding likely influences GPCR conformation, stability, and/or signaling.
  • Further investigation into cholesterol-GPCR interactions is warranted to understand their physiological roles.