Three-dimensional structure of the LDL receptor-binding domain of the human apolipoprotein E2 (Arg136 → Cys) variant
Abstract
The familial lipoprotein disorder type III hyperlipoproteinemia (HLP) is usually inherited as a recessive trait. Indeed, more than 90% of affected individuals are homozygous for a receptor binding-defective isoform of apolipoprotein (apo) E, apo E2. However, some rare apo E variants have been described that dominantly (thus in a single dose) predispose to the disease. Amino acid substitutions, which are accompanied with the loss of positive charges within the proposed apo E binding-region to lipoprotein receptors, seem to be responsible in most of these cases for the dominance with respect to the expression of type III HLP. So far available data in the literature on the naturally occurring human apo E2 (Arg136-->Cys) variant are not conclusive about its recessive or dominant character. We recently identified a subject heterozygous for this mutation, presenting the typical clinical and biochemical characteristics of type III HLP. In the present study we performed further analysis of the mutation on apo E structure and function based on computer modeling. Our combined data point to a dominant influence of the apo E2 (Arg136-->Cys) variant with respect to the transmission of the disease.
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In experimental studies, the ApoEch protein was associated with reduced Aβ42 burden and a differential impact of ApoE isoforms (ApoE4 > 3 > 2 >> 3ch) on heparin binding.
“In experimental studies, we found that the ApoEch protein was associated with reduced Aβ42 burden and a differential impact of ApoE isoforms (ApoE4 > 3 > 2 >> 3ch) on heparin binding, and demonstrated the ability of a targeted antibody to lower wild-type ApoE3 binding15.”
From Exceptionally low likelihood of Alzheimer’s dementia in APOE2 homozygotes from a 5,000-person neuropathological study (2020) · cites this paper as [15]
A targeted antibody can lower wild-type ApoE3 binding.
“In experimental studies, we found that the ApoEch protein was associated with reduced Aβ42 burden and a differential impact of ApoE isoforms (ApoE4 > 3 > 2 >> 3ch) on heparin binding, and demonstrated the ability of a targeted antibody to lower wild-type ApoE3 binding15.”
From Exceptionally low likelihood of Alzheimer’s dementia in APOE2 homozygotes from a 5,000-person neuropathological study (2020) · cites this paper as [15]
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Conformational Reorganisation of Apolipoprotein E Triggered by Phospholipid AssemblyPreprint
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- Authors
- Feussner, G., Albanese, M., & Valencia, A.
- Affiliations
- University Hospital Heidelberg (DE)
- European Molecular Biology Laboratory (DE)
- ORCID
- Valencia, Alfonso
- Venue
- Atherosclerosis
- Publisher
- Elsevier BV
- Published
- 1996-10
- Volume
- 126
- Issue
- 2
- Pages
- 177-184
- ISSN
- 0021-9150 (ISSN-L)
- OpenAlex
- W1981437877
- Cited by
- 7
- References
- 32
- Citations by year
- 2024: 1 · 2021: 1 · 2020: 2 · 2014: 1
- FWCI
- 0.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Atherosclerosis (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
- Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
- Keywords
- apolipoprotein E2, type III hyperlipoproteinemia, LDL receptor binding, dominant inheritance, three-dimensional structure, computer modeling, amino acid substitutions, lipoprotein metabolism
- MeSH terms
- Apolipoproteins E, Female, Heterozygote, Humans, Hyperlipoproteinemia Type III, Image Processing, Computer-Assisted, Isoelectric Focusing, Middle Aged, Molecular Conformation, Receptors, LDL, Point Mutation, Apolipoprotein E2
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