Structural differences between apoE3 and apoE4 may be useful in developing therapeutic agents for Alzheimer's disease

Carl Frieden, Kanchan Garai

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

Apolipoproteins E3 and E4, proteins with a molecular mass of 34.15 kDa, differ by a single amino acid change. ApoE4 contains an arginine residue at position 112, whereas apoE3 has a cysteine at this position. ApoE4 is the major risk factor for late-onset Alzheimer's disease, whereas apoE3, the common isoform, is neutral with respect to this disease. Here, using literature data from both hydrogen-deuterium exchange and site-directed mutations, we suggest structural differences between these two isoforms that are distant from the site of the arginine-to-cysteine change. These structural differences involve sequences from both the N- and C- terminal domains, sequentially far apart but structurally close. In addition, these regions are close to regions that bind lipid and to a region involved in association of apoE monomers to higher molecular weight forms. We discuss the possibility that these regions could be targeted preferentially to affect the function of apoE4 relative to apoE3.

Original languageEnglish
Pages (from-to)8913-8918
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume109
Issue number23
DOIs
StatePublished - Jun 5 2012

Keywords

  • Amyloid
  • Charge relay
  • Lipid binding
  • Structure propagation

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