Recombinant Human PEAR1 Protein, CF

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R&D Systems Recombinant Proteins and Enzymes
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Citations (2)
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Recombinant Human PEAR1 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 binding ability in a functional ELISA. Recombinant Human PEAR1 (Catalog # 4527-PR) binds Recombinant Human Fc epsilon RI alpha (Catalog # 6678-FC) with an ED50 of 0.0400-0.340 µg/mL.
Chinese Hamster Ovary cell line, CHO-derived human PEAR1 protein
Leu21-Ser754 with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
78.3 kDa
120-130 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 200 μg/mL in 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: PEAR1

Platelet endothelial aggregation receptor 1 (PEAR1) is a 150 kDa type I transmembrane protein and member of the MEGF family of proteins (1). Human PEAR1 is synthesized as a 1037 amino acid (aa) precursor that contains a 20 aa signal sequence, a 735 aa extracellular domain (ECD), a 21 aa transmembrane region, and a 261 aa cytoplasmic region (SwissProt # Q5VY43). The ECD consists of 15 EGF-like repeats that vary in length from 39 to 42 aa and contain a consensus sequence of CX1-2GX2GX2-4CX3CX1-3CX1-2GX1-2CX4GX1CX1CX2GX2GX2C (1). The consensus repeat contains six conserved glycine residues and eight conserved cysteine residues, suggesting four disulfide-bonded cysteine pairs in each EGF repeat (1). Within the ECD, there are also five potential sites for N-linked glycosylation. The cytoplasmic region contains five potential Src homology 3-binding, proline-rich domains (1). Mature human PEAR1 is 84% aa identical to mature mouse PEAR1.  PEAR1 is most highly expressed in platelets and endothelial cells (1). High affinity immunoglobulin E receptor subunit  alpha (Fc epsilon R1 alpha ) has been identified as an activating platelet endothelium aggregation receptor 1 (PEAR1) ligand. The signaling enhances and stabilizes platelet aggregates, which leads to tyrosine-phosphorylation of PEAR1 (2). Phosphorylation of PEAR1 is inhibited by the alpha IIb beta 3 antagonist eptifibatide, thus demonstrating that PEAR1 tyrosine phosphorylation is dependent on surface contacts between activated platelets (1). PEAR1 can be phosphorylated in an alpha IIb beta 3 integrin-dependent manner on tyrosine (Tyr925) and serine residues (Ser593 and Ser1029) and, potentially, at Tyr804, Tyr943, and Tyr979 (1). Sushi, von Willebrand factor type A, EFG and pentraxin domain containing 1 (SVEP1) has also been identified as a high affinity ligand for PEAR1 and this interaction promotes disease associated AKT/mTOR signaling in vascular cells and platelets (3). Inherited PEAR1 variations that alter expression or function of the platelet signaling molecule could modify agonist-induced aggregation in native platelets (3). In addition, a genetic variant in PEAR1 could be an important determinant of residual platelet function during aspirin treatment, because the COX1/thromboxane A2 pathway will be strongly inhibited by aspirin, and maximal aggregation will then be dependent on other secondary signaling pathways (4).

  1. Nanda, N. et al. (2005) J. Biol. Chem. 280:24680.
  2. Sun, Y. et al. (2015) Mol Cell Proteomics. 14(5): 1265-1274
  3. Elenbaas, J. et al. (2023) Nat Commun. 14: 850
  4. Herrera-Galeano, J.E. et al. (2008) Arterioscler. Thromb. Vasc. Biol. 28:1484.
Long Name
Platelet endothelial aggregation receptor 1
Entrez Gene IDs
375033 (Human); 73182 (Mouse)
Alternate Names
Jedi; PEAR1; platelet endothelial aggregation receptor 1

Citations for Recombinant Human PEAR1 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. A novel mechanism of sustained platelet αIIbβ3 activation via PEAR1.
    Authors: Kauskot A, Di Michele M, Loyen S, Freson K, Verhamme P, Hoylaerts MF
    Blood, 2012-02-27;119(17):4056-65.
    Species: Human
    Sample Types: Platelet Rich Plasma (PRP)
    Applications: Bioassay
  2. Identification of a specific intronic PEAR1 gene variant associated with greater platelet aggregability and protein expression.
    Authors: Faraday N, Yanek LR, Yang XP, Mathias R, Herrera-Galeano JE, Suktitipat B, Qayyum R, Johnson AD, Chen MH, Tofler GH, Ruczinski I, Friedman AD, Gylfason A, Thorsteinsdottir U, Bray PF, O'Donnell CJ, Becker DM, Becker LC
    Blood, 2011-07-26;118(12):3367-75.
    Applications: ELISA (Standard)


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