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A two-step model for lipoprotein(a) formation

V N Trieu1, W J McConathy

  • 1Department of Medicine, University of North Texas Health Science Center, Fort Worth, Texas 76107, USA.

The Journal of Biological Chemistry
|June 30, 1995
PubMed
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Lipoprotein(a) (Lp(a)) formation involves two steps: initial noncovalent binding of apolipoprotein(a) (apo(a)) to LDL via T6/T7, followed by covalent linkage by T9. This clarifies Lp(a) assembly and aids inhibitor design.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cardiovascular Science

Background:

  • Lipoprotein(a) (Lp(a)) is a significant risk factor for coronary artery disease.
  • Lp(a) consists of apolipoprotein(a) (apo(a)) covalently linked to apolipoprotein B (apoB) on LDL particles.
  • Apo(a) shares homology with plasminogen and features multiple kringle-4-like domains (T1-T10).

Purpose of the Study:

  • To elucidate the molecular mechanism of Lp(a) assembly.
  • To identify the specific domains of apo(a) involved in Lp(a) formation.
  • To propose a refined model for Lp(a) biogenesis.

Main Methods:

  • Analysis of apolipoprotein(a) kringle domains.
  • Investigation of protein-protein interactions between apo(a) and LDL components.

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  • Biochemical assays to determine binding affinities.

    • Main Results:

    • Kringle 9 (T9) of apo(a) is responsible for the covalent linkage but lacks direct affinity for LDL.
    • Kringle 6 (T6) and potentially Kringle 7 (T7) mediate an initial noncovalent interaction between apo(a) and LDL.
    • These findings necessitate a two-step model for Lp(a) formation.

    Conclusions:

    • A two-step model for Lp(a) formation is proposed, involving initial noncovalent binding followed by covalent linkage.
    • Understanding this mechanism is crucial for developing inhibitors of Lp(a) formation.
    • These inhibitors represent potential therapeutic agents for antihyperlipoprotein(a) conditions.