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Interaction of human serum apolipoprotein B with sodium deoxycholate
Biophysical Chemistry
|July 1, 1983
Summary
Apolipoprotein B (Apo B)-deoxycholate (DOC) complexes form large, elongated structures that slowly dissociate into smaller subunits over time. This dissociation is influenced by the DOC/Apo B ratio and sample aging, suggesting subunit interactions.
Area of Science:
- Biochemistry
- Lipid Metabolism
Background:
- Apolipoprotein B (Apo B) is a key protein in lipoprotein metabolism.
- Understanding the structural properties of Apo B complexes is crucial for lipid research.
Purpose of the Study:
- To characterize the structure and dissociation of apolipoprotein B-deoxycholate complexes.
- To investigate the influence of deoxycholate concentration and aging on complex stability.
Main Methods:
- Gel filtration chromatography to prepare Apo B-DOC complexes.
- Scanning molecular sieve chromatography and analytical ultracentrifugation to analyze dissociation.
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis to assess structural similarity.
Main Results:
- Two populations of Apo B-DOC complexes were identified with varying lipid content.
- Fresh complexes were large and elongated, resembling native low-density lipoprotein.
- Complexes dissociated slowly into smaller subunits over 10 days, influenced by DOC/Apo B ratio and aging.
- Preferential hydration of complexes upon DOC interaction was observed.
Conclusions:
- Apo B-DOC complexes exhibit complex dissociation dynamics.
- Subunit interactions and preferential hydration play roles in complex stability and structure.
- Aging and DOC/Apo B ratio are critical factors in Apo B-DOC complex dissociation.