Recombinant Human Apolipoprotein E R2 Protein, CF

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R&D Systems Recombinant Proteins and Enzymes
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Recombinant Human Apolipoprotein E R2 Protein, CF Summary

Product Specifications

>90%, by SDS-PAGE under reducing conditions and visualized by silver stain
Endotoxin Level
<0.01 EU per 1 μg of the protein by the LAL method.
Measured by its ability to compete with biotinylated rhApoE R2 for binding to rmReelin (Catalog # 3820-MR) in a functional ELISA. Optimal dilutions should be determined by each laboratory for each application.
Chinese Hamster Ovary cell line, CHO-derived human Apolipoprotein E R2/ApoE R2 protein
Asp35-Lys818 (Ala262Val), with a C-terminal 10-His tag
Accession #
N-terminal Sequence
Structure / Form
Predicted Molecular Mass
87.5 kDa
140-150 kDa, reducing conditions

Product Datasheets

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Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 100 μg/mL in sterile PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
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Background: Apolipoprotein E R2/ApoE R2

ApoE R2, also known as LRP8, is an LDL receptor family protein that is involved in nervous system development and function (1, 2). Human ApoE R2 has a 794 amino acid (aa) extracellular domain (ECD) and a 116 aa cytoplasmic region. The ECD contains seven LDLR class A repeats followed by two EGF-like repeats, five LDLR class B repeats, and a region rich in O-linked glycosylation. Alternatively spliced variants of human ApoE R2 have deletions of LDLR-A repeats # 4 - 7, the O-linked glycosylation region, or approximately half of the cytoplasmic domain (3). Cleavage of ApoE R2 by gamma -secretase, metalloproteases, and furin-like enzymes results in the liberation of the cytoplasmic, extracellular, and ligand binding domains (4 - 6). The cytoplasmic NPxY motif binds to PTB domain-containing adaptor proteins (7 - 10). Among these, FE65 and PSD95 couple ApoE R2 with APP or the NMDA receptor, respectively (9, 10). ApoE R2 and NMDA receptor ligands modulate adaptor interactions, NMDA-mediated ion currents, and the proteolytic processing of both ApoE R2 and APP (9 - 12). ApoE R2 and the NMDA receptor also associate extracellularly (10). ApoE R2 binds ApoE-containing lipoproteins and the large modular protein, reelin (13). Reelin signaling through ApoE R2 is critical for neuronal migration and positioning in the developing brain (13). In the adult brain, ApoE R2 functions in hippocampal synapse maturation, synaptic plasticity, and memory formation (7, 11, 14, 15). ApoE R2 is also expressed at the neuromuscular junction but does not appear to participate in the development or function of that structure (16). Deficits in ApoE R2, reelin, and ApoE function have been linked to several cognitive and mood disorders (1). Within the ECD, human ApoE R2 shares 89% aa sequence identity with mouse and rat ApoE R2. It shares 46% and 48% aa sequence identity with human LDL R and VLDL R, respectively.

  1. Qiu, S. et al. (2006) Neurobiol. Learn. Mem. 85:16.
  2. May, P. et al. (2005) Cell. Mol. Life Sci. 62:2325.
  3. Kim, D.H. et al. (1997) J. Biol. Chem. 272:8498.
  4. May, P. et al. (2003) J. Biol. Chem. 278:37386.
  5. Koch, S. et al. (2002) EMBO J. 21:5996.
  6. Hoe, H.-S. and G.W. Rebeck (2005) Mol. Brain Res. 137:31.
  7. Beffert, U. et al. (2006) J. Neurosci. 26:2041.
  8. Sun, X.M. and A.K. Soutar (2003) J. Biol. Chem. 278:19926.
  9. Hoe, H.-S. et al. (2006) J. Biol. Chem. 281:3425.
  10. Beffert, U. et al. (2005) Neuron 47:567.
  11. Hoe, H.-S. et al. (2005) Mol. Cell. Biol. 25:9259.
  12. D’Arcangelo, G. et al. (1999) Neuron 24:471.
  13. Niu, S. et al. (2004) Neuron 41:71.
  14. Weeber, E.J. et al. (2002) J. Biol. Chem. 277:39944.
  15. Quattrocchi, C.C. et al. (2003) Science 301:649.
Long Name
Apolipoprotein E Receptor 2
Entrez Gene IDs
7804 (Human); 16975 (Mouse); 362558 (Rat)
Alternate Names
ApoER2; APOER2HSZ75190; Apolipoprotein E R2; Apolipoprotein E receptor 2; low density lipoprotein receptor-related protein 8, apolipoprotein e receptor; low-density lipoprotein receptor-related protein 8; Lr8b; LRP8; LRP-8; MCI1

Citations for Recombinant Human Apolipoprotein E R2 Protein, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

2 Citations: Showing 1 - 2
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  1. Reelin is modulated by diet-induced obesity and has direct actions on arcuate proopiomelanocortin neurons
    Authors: BL Roberts, BJ Bennett, CM Bennett, JM Carroll, LS Dalbøge, C Hall, W Hassouneh, KM Heppner, MA Kirigiti, SR Lindsley, KG Tennant, CA True, A Whittle, AC Wolf, CT Roberts, M Tang-Chris, MW Sleeman, MA Cowley, KL Grove, P Kievit
    Mol Metab, 2019;0(0):.
    Species: Human
    Sample Types: Protein
    Applications: Bioassay
  2. PCSK9 is not involved in the degradation of LDL receptors and BACE1 in the adult mouse brain.
    Authors: Liu M, Wu G, Baysarowich J
    J. Lipid Res., 2010;51(9):2611-8.
    Species: N/A
    Sample Types: N/A
    Applications: Western Blot


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