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Related Experiment Videos

Primary structure of apoB-100

C Yang1, Z W Gu, M Yang

  • 1Department of Medicine, Baylor College of Medicine, Houston, Texas.

Chemistry and Physics of Lipids
|January 1, 1994
PubMed
Summary
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Apolipoprotein B-100 (apoB-100) structure in LDL was analyzed, revealing disulfide bonds and free sulfhydryls. This research proposes an elongated apoB-100 structure and identifies a potential linkage site with apolipoprotein [a].

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Apolipoprotein B-100 (apoB-100) is the primary protein in low-density lipoprotein (LDL), crucial for receptor binding.
  • Lipoprotein [a] (Lp[a]) comprises LDL and apolipoprotein [a] (apo[a]).
  • Understanding apoB-100 structure is key to lipoprotein function and disease mechanisms.

Purpose of the Study:

  • To characterize the sulfhydryl and disulfide groups within apoB-100 in LDL.
  • To delineate the structural domains of apoB-100 based on protease susceptibility.
  • To propose a structural model for apoB-100 within the LDL particle and its interaction with apo[a].

Main Methods:

  • High-performance liquid chromatography (HPLC) for identifying sulfhydryl and disulfide groups.

Related Experiment Videos

  • Use of a fluorescent sulfhydryl probe (5-iodoacetoamidofluoresceine).
  • Differential trypsin digestion to map apoB-100 domains.

    • Main Results:

    • Sixteen of 25 cysteine residues in apoB-100 are involved in disulfide bonds; all 14 N-terminal cysteines form disulfide bridges.
    • Two free sulfhydryl groups were identified at positions 3734 and 4190.
    • ApoB-100 was divided into five domains based on trypsin susceptibility, with distinct regions of trypsin-releasable (TR) and trypsin-non-releasable (TN) segments.

    Conclusions:

    • The study proposes an elongated, wrapping structure for apoB-100 around the LDL particle.
    • Cysteine 3734 (Cys3734) of apoB-100 is identified as a potential site for disulfide linkage with apo[a].
    • These findings provide insights into LDL and Lp[a] structure and their interactions.