Cited by 229Protein Structure and DynamicsLipid Membrane Structure and BehaviorAlzheimer's disease research and treatments

Human apolipoprotein E3 in aqueous solution. II. Properties of the amino- and carboxyl-terminal domains.

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Aggerbeck, L P, Wetterau, J R, Weisgraber, K H, Wu, C S, Lindgren, F T·1988·Journal of Biological Chemistry

Abstract

Hydrodynamic, chromatographic, and spectroscopic techniques were used to study the aqueous solution properties of the two structural domains of human apolipoprotein (apo) E3. An amino-terminal thrombolytic fragment of apoE (22 kDa, residues 1-191) and a carboxyl-terminal thrombolytic fragment of apoE (10 kDa, residues 216-299) were used as models for the two domains. Sedimentation equilibrium ultracentrifugation showed that apoE and the 10-kDa model domain self-associated predominantly as tetramers. The 22-kDa model domain was primarily monomeric. Molecular weights calculated from the weight average sedimentation and diffusion coefficients or from the sedimentation coefficients and Stokes radii were in agreement with the sedimentation equilibrium results. Derived frictional coefficients suggest larger axial ratios and/or more extensive hydration for the apoE and the 10-kDa domain tetramers as compared with the 22-kDa domain. Proteolysis of apoE followed by high performance liquid chromatography showed rapid production of free 22-kDa domain, whereas the free 10-kDa domain appeared as a tetramer late in the course of the hydrolysis. Assessment by circular dichroism demonstrated that both model domains and apoE had over 54% alpha-helical content, which changed little in a detergent (octyl-beta-D-glucopyranoside) or lipid (dimyristoylphosphatidylcholine) environment. In contrast to the circular dichroism results, apoE and the 10-kDa domain showed a marked blue shift in the fluorescence maximum in a lipid environment. The results suggest that the self-association of apoE in solution as a tetramer is mediated by the carboxyl-terminal domain and that the amino- and carboxyl-terminal domains do not associate with one another. The amino-terminal domain is most likely compact and globular, whereas the carboxyl-terminal domain is probably elongated. The isolated model domains appear to have structures that are similar to those of the domains in the intact protein.

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Crossref · 10.1016/s0021-9258(18)68779-4

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Authors
Aggerbeck, L. P., Wetterau, J. R., Weisgraber, K. H., Wu, C. S., & Lindgren, F. T.
Affiliations
University of California, San Francisco (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1988-05
Volume
263
Issue
13
Pages
6249-6258
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1490077018
Cited by
229
References
54
Citations by year
2025: 4 · 2024: 2 · 2022: 2 · 2021: 1 · 2020: 3 · 2019: 5 · 2018: 4 · 2017: 3 · 2016: 3 · 2015: 1 · 2014: 2 · 2013: 3 · 2012: 4
FWCI
2.24
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Heart, Lung, and Blood Institute (HL 18577-11)
  • National Institute of General Medical Sciences (GM-10880)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Lipid Membrane Structure and Behavior
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
apolipoprotein E3, protein self-association, tetramer formation, N-terminal domain, C-terminal domain, protein conformation, alpha-helical content, octyl glucoside, dimyristoylphosphatidylcholine, hydrodynamic radius, friction coefficient, protein hydration, proteolysis, fluorescence blue shift
MeSH terms
Algorithms, Apolipoproteins E, Chromatography, High Pressure Liquid, Circular Dichroism, Diffusion, Humans, Molecular Weight, Protein Conformation, Spectrometry, Fluorescence, Apolipoprotein E3

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