4.7 Article

Sialic acid moiety of apolipoprotein E3 at Thr194 affects its interaction with β-amyloid1-42 peptides

Journal

CLINICA CHIMICA ACTA
Volume 388, Issue 1-2, Pages 123-129

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.cca.2007.10.024

Keywords

Alzheimer's disease; senile plaque; surface plasmon resonance assay; cerebrospinal fluid; apolipoprotein E; sialic acid

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Background: The interaction between apolipoprotein (apo) E and beta-amyloid (A beta) is associated with the development of Alzheimer's disease (AD); however, the details remain unknown. ApoE in cerebrospinal fluid is extensively sialylated, and sialylation of certain proteins are known to modulate biological function. We investigated the effects of a sialic acid moiety of apoE on the apoE-A interaction. Methods: We prepared normal apoE3 and its mutant (Thr(194) -> Ala) and analyzed their interactions with A beta(1-42) by using the surface plasmon resonance (SPR) assay. In addition, we per-formed the SPR assay by using apoE-containing lipoproteins treated with neuraminidase. We also assessed the effect of the mutation on the interaction of apoE3 with liposomes. Results: The binding avidity of the mutant apoE3(#) was approximately 50% that of normal apoE3 (p<0.0001). The binding avidity of the apoE-containing lipoproteins for A beta(1-42) reduced after neuraminidase treatment. Conclusions: We suggest that AD development is controlled not only by the apoE isoforms but also by the posttranslational modifications in apoE, such as those in the sialic acid moieties, which are abundant in apoE derived from the brain. (c) 2007 Elsevier B.V All rights reserved.

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