Recombinant Human CUL5/RBX2 Complex Protein, CF

Catalog #: E3-450 Datasheet / COA / SDS

Discontinued Product

E3-450 has been discontinued.
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Product Details

Recombinant Human CUL5/RBX2 Complex Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by Colloidal Coomassie® Blue stain.
Typical enzyme concentration to support in vitro conjugation will depend on experimental conditions.
Spodoptera frugiperda, Sf 21 (baculovirus)-derived human CUL5/RBX2 Complex protein
Accession #
Predicted Molecular Mass
94 kDa (CUL5), 13 kDa (RBX2)

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 X mg/ml (X μM) in 50 mM HEPES pH 7.5, 200 mM NaCl, 10% (v/v) Glycerol, 1 mM DTT
Shipping The product is shipped with dry ice or equivalent. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 60 months from date of receipt, -70 °C as supplied.
  • 3 months, -70 °C under sterile conditions after opening.
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Reconstitution Calculator

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Background: CUL5/RBX2 Complex

Cullin-5 (CUL5) is a core component of multiple ECS (Elongin-CUL5-SOCS-box protein) E3 ubiquitin ligase complexes that mediate the ubiquitination of proteins involved in cytokine receptor signal transduction.  In the ECS complex, CUL5 serves as a scaffold that organizes the Elongin B/Elongin C/SOCS (Suppressor of Cytokine Signaling) recognition subunits with the RBX subunit and contributes to catalysis through positioning of the substrate and an E2 ubiquitin-conjugating enzyme.  In vivo, the E3 ubiquitin ligase activity of the ECS complex is dependent on neddylation of the cullin subunit, though neddylation may be dispensable for some in vitro reactions.  This complex consists of an N-terminal 10-His tagged CUL5 (UniProt Q93034) and untagged RBX2 (UniProt Q9UBF6).

  1. Baek K., et al. (2020) Nature  578: 461
  2. Duda D.M., et al. (2012) Mol. Cell  47: 371
  3. Kamura T., et al. (2004) Genes Dev.  18: 3055
  4. Kamura T., et al. (2001) J. Biol. Chem.  276: 29748
Long Name
Cullin 5/Ring Box Protein 2
Alternate Names
CUL5/RBX2 Complex


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