期刊
BIOCHEMISTRY
卷 45, 期 2, 页码 381-390出版社
AMER CHEMICAL SOC
DOI: 10.1021/bi051765s
关键词
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资金
- NIA NIH HHS [AG19121, R01 AG019121, R01 AG027924, R01 AG027924-01] Funding Source: Medline
- NIDDK NIH HHS [R01 DK061761, R01 DK061761-05] Funding Source: Medline
- NINDS NIH HHS [NS520138, NS37525] Funding Source: Medline
Recent studies have shown that the lipidation and assembly state of apolipoprotein E (apoE) determine receptor recognition and amyloid-beta peptide (A beta) binding. We previously demonstrated that apoE secreted by HEK cells stably expressing apoE3 or apoE4 (HEK-apoE) binds A beta and inhibits A beta-induced neurotoxicity by an isoform-specific process that requires apoE receptors. Here we characterized the structure of HEK-apoE assemblies and determined their receptor binding specificity. By chromatography, HEK-apoE elutes in high molecular mass fractions and is the size of plasma HDL, consistent with a multiprotein assembly. No lipid was associated with these apoE assemblies. Several methods for analyzing receptor binding indicate that HEK-apoE is a ligand for low-density lipoprotein (LDL) receptor-related protein (LRP) but not the LDL receptor. This suggests that self-assembly of apoE may induce a functional conformation necessary for binding to LRP. Our results indicate that, in addition to lipid content, the assembly state of apoE influences A beta binding and receptor recognition.
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