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Related Experiment Videos

Apolipoprotein B: from editosome to proteasome.

L Chan1, B H Chang, W Liao

  • 1Division of Endocrinology and Metabolism, Department of Medicine Baylor College of Medicine, Houston, Texas 77030, USA.

Recent Progress in Hormone Research
|October 19, 2000
PubMed
Summary

Apolipoprotein B (apoB) research has revealed two forms, apoB-100 and apoB-48, and the discovery of RNA editing in higher eukaryotes. Intracellular degradation, primarily via the proteasome-ubiquitin pathway, significantly impacts apoB-100 production.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Apolipoprotein B (apoB) is the protein component of low-density lipoproteins (LDLs).
  • Early research focused on apoB's physical-chemical properties due to its large size and insolubility.
  • Understanding apoB's molecular weight and structure was a significant challenge for decades.

Purpose of the Study:

  • To review major advancements in apoB research over the last 10-15 years.
  • To highlight breakthroughs in apoB structure, function, and expression.
  • To discuss the discovery and implications of RNA editing and apoB intracellular degradation.

Main Methods:

  • cDNA cloning and direct peptide sequencing for apoB-100 primary structure elucidation.
  • Analysis of apoB function in vivo using transgenic and knockout animal models.

Related Experiment Videos

  • Identification and cloning of microsomal triglyceride transfer protein (MTP) and APOBEC-1.

    • Main Results:

    • Discovery of two apoB forms: apoB-100 and apoB-48.
    • Elucidation of apoB-100 primary structure and identification of apoB-48 as a product of RNA-edited apoB mRNA.
    • Demonstration that MTP is essential for apoB production and that the proteasome-ubiquitin pathway mediates apoB-100 intracellular degradation.

    Conclusions:

    • ApoB research has progressed significantly due to breakthroughs in structural elucidation and molecular mechanisms.
    • RNA editing and intracellular degradation are critical processes influencing apoB metabolism.
    • Further research benefits from the established knowledge of apoB structure, function, and expression.