Title
Very-low-density lipoprotein binding to the apolipoprotein E receptor 2 is enhanced by lipoprotein lipase, and does not require apolipoprotein E
Author
Gaubius Instituut TNO
Tacken, P.J.
de Beer, F.
van Vark, L.C.
Havekes, L.M.
Hofker, M.H.
van Dijk, K.W.
Publication year
2000
Abstract
The apolipoprotein (apo)E receptor 2 (apoER2) is a recently cloned member of the low-density lipoprotein (LDL) receptor (LDLR) family, showing a high homology with both the LDLR and the very-low-density lipoprotein (VLDL) receptor (VLDLR). In the present study, the binding characteristics of the apoER2 with respect to apoE and lipoprotein lipase (LPL) were investigated. VLDL was isolated from both apoE-deficient mice and mice expressing the human APOE2 (Arg158 → Cys) and APOE3-Leiden isoforms on an Apoe(-/-),Ldlr(-/-) double knock-out background, apoE-rich rabbit β-VLDL was used as a positive control for binding. Binding experiments performed with Chinese hamster ovary cells expressing the human apoER2 showed that the receptor was able to bind VLDL containing either of the apoE isoforms, as well as the apoE-deficient VLDL. Hence, in contrast with the VLDLR, the apoER2 is not strictly dependent on apoE for VLDL binding. Since LPL has been shown to enhance the binding of lipoproteins to several members of the LDLR family, including the LDLR-related protein, VLDL receptor, gp330 and the LDLR itself, VLDL binding experiments were performed in the presence of LPL. Addition of LPL resulted in a significant increase in apoER2 binding for all VLDL fractions used in this study. In conclusion, lipoprotein binding of VLDL to the apoER2 is enhanced in the presence of LPL, and is not restricted to apoE-containing lipoproteins. Chemicals/CAS: apolipoprotein E receptor 2; Apolipoprotein E2; apolipoprotein E3 (Leidein); Apolipoprotein E3; Apolipoproteins E; Lipoprotein Lipase, EC 3.1.1.34; Lipoproteins, VLDL; Receptors, Lipoprotein
Subject
Animals
Apolipoprotein E2
Apolipoprotein E3
Apolipoproteins E
CHO Cells
Cricetinae
Food Deprivation
Gene Deletion
Lipoprotein Lipase
Lipoproteins, VLDL
Mice
Mice, Knockout
Protein Binding
Receptors, Lipoprotein
Animalia
Cricetinae
Cricetulus griseus
Mus musculus
Oryctolagus cuniculus
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DOI
https://doi.org/10.1042/0264-6021:3470357
TNO identifier
235524
ISSN
0264-6021
Source
Biochemical Journal, 347 (347), 357-361
Document type
article