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Related Experiment Videos

Structure and physiologic function of the low-density lipoprotein receptor.

Hyesung Jeon1, Stephen C Blacklow

  • 1Life Sciences Division, Korea Institute of Science and Technology, Seoul 136-791, Korea. hjeon@kist.re.kr

Annual Review of Biochemistry
|June 15, 2005
PubMed
Summary

The low-density lipoprotein receptor (LDLR) binds cholesterol particles for cell uptake. Structural studies reveal how LDLR binds, releases, and interacts with cellular machinery for cholesterol regulation.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Cell Biology

Background:

  • The low-density lipoprotein receptor (LDLR) mediates cellular cholesterol uptake.
  • LDLR binds cholesterol-carrying lipoproteins like LDL and beta-VLDL at the cell surface.
  • Ligand release occurs in the acidic endosomal environment.

Purpose of the Study:

  • To review biochemical and structural studies of LDLR and its ligands.
  • To elucidate how LDLR structure influences binding of LDL and beta-VLDL.
  • To understand LDLR ligand release mechanisms and endocytic machinery interaction.

Main Methods:

  • Biochemical assays to study receptor-ligand interactions.
  • Structural biology techniques (e.g., X-ray crystallography) to determine LDLR complex structures.

Related Experiment Videos

  • Analysis of LDLR cytoplasmic tail interactions with endocytic proteins.

    • Main Results:

    • Specific structural features of LDLR dictate binding affinity for LDL and beta-VLDL.
    • Low pH in endosomes triggers conformational changes for ligand release.
    • The LDLR cytoplasmic tail is crucial for recruitment into endocytic vesicles.

    Conclusions:

    • LDLR structure-function relationships are key to understanding lipoprotein metabolism.
    • The pH-dependent conformational change is a critical mechanism for LDLR recycling.
    • LDLR's interaction with endocytic machinery ensures efficient cholesterol transport.