Recombinant Human Brorin/VWC2 Protein, CF

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R&D Systems Recombinant Proteins and Enzymes
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Recombinant Human Brorin/VWC2 Protein, CF Summary

Product Specifications

>95%, 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. When rhBrorin/VWC-2 is immobilized at 10 μg/mL (100 μL/well), the concentration of rhBMP-6 that produces 50% of the optimal binding response is found to be approximately 0.05-0.5 μg/mL.
Mouse myeloma cell line, NS0-derived human Brorin/VWC2 protein
Ser28-Met325, with an N-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
33.5 kDa (monomer)
43 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 250 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: Brorin/VWC2

Brorin (brain-specific chordin-like protein), also called VWC2, is an ~46 kDa glycoprotein that is a member of the Chordin family of secreted BMP regulators (1 ‑ 3). The human Brorin cDNA encodes 325 amino acids (aa) including a 27 aa signal sequence and a 298 aa secreted mature protein with two VWFC (von Willebrand factor C) domains. These domains contain a pattern of 10 cysteine residues that is conserved in other family members, with the remaining aa sequence sharing little identity (1). Human Brorin shares 90%, 91% and 95% aa sequence identity with mouse, rat and equine Brorin, respectively. It also shares aa identity with VWC2L (Brorin-like) of 37% overall and 62% within the VWFC domains (4). Brorin is predominantly expressed in embryonic and adult neural tissues in the mouse (1). Expression of Brorin mRNA is concentrated in neurons within the diencephalon and medulla oblongata, but is not detected in the developing cerebral cortex (1). Brorin binds and antagonizes BMPs, interacting via the VWFC domains (1 - 3). It promotes neurogenesis in mouse neural precursors (1). Knockdown of Brorin in zebrafish embryos results in morphological abnormalities in the brain and eye (1, 4).

  1. Koike, N. et al. (2007) J. Biol. Chem. 282:15843.
  2. Zhang, J-L. et al. (2007) J. Biol. Chem. 282:20002.
  3. Fujisawa, T. et al. (2009) Biochem. Biophys. Res. Commun. 385:215.
  4. Miwa, H. et al. (2009) FEBS Lett. 583:3643.
Long Name
von Willebrand Factor A2 Domain
Entrez Gene IDs
375567 (Human); 319922 (Mouse); 501231 (Rat)
Alternate Names
Brain-specific chordin-like protein; Brain-Specific Chordin-Like; Brorin; PSST739; UNQ739; Von Willebrand Factor C Domain Containing 2; Von Willebrand Factor C Domain-Containing Protein 2; VWC2


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