Recombinant Human S5a/Angiocidin Biotin Protein, CF

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Citations (1)
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Recombinant Human S5a/Angiocidin Biotin Protein, CF Summary

>95%, by SDS-PAGE under reducing conditions and visualized by Colloidal Coomassie® Blue stain
Recombinant Human S5a/Angiocidin Biotin is ideal for use as a control substrate for in vitro Ubiquitin conjugation. Reaction conditions will need to be optimized for each specific application. We recommend an initial Recombinant Human S5a/Angiocidin Biotin concentration of 1-5 μM.
E. coli-derived human S5a/Angiocidin protein
Accession #
Predicted Molecular Mass
43 kDa

Product Datasheets

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 Supplied as a solution in HEPES, NaCl, DTT and Glycerol.
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.
  • 12 months from date of receipt, -70 °C as supplied.
  • 3 months, -70 °C under sterile conditions after opening.
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Background: S5a/Angiocidin

S5a/Angiocidin, also known as Anti-secretory Factor (ASF), is classified under the gene PSMD4, but is often referred to by a different name depending on the context in which it is described. S5a and ASF have identical 377 amino acid (aa) sequences, while Angiocidin is described as having an additional Gly255Glu256Arg257 sequence in its C-Terminus (1-3). The human protein shares 96% and 99% aa sequence identity with its mouse and rat orthologs, respectively. Structurally, it contains an N-terminal von Willebrand Factor type A domain and two C-terminal Ubiquitin-interacting motifs (UIM). It acts as a Ubiquitin-binding protein where it is most commonly referred to as S5a or in yeast as Rpn10. It is part of the 19S regulatory subunit of the 26S Proteasome where its UIM recognizes poly-ubiquitinated proteins destined for degradation (4). As a part of the proteasome complex, it may also recognize the Ubiquitin-like modifier FAT10 (5). Free cytoplasmic forms also exist where its ubiquitination is catalyzed by a range of Ubiquitin E3 ligases from different classes. Therefore, experimentally S5a/Angiocidin may act as a useful substrate to monitor the activity of (E3) ligases, independent of their specific mechanisms of action (6). In cancer biology, where it is often referred to as Angiocidin, it is shown to slow tumor progression. It is found in the extracellular matrix of certain tumor subtypes, and it may act by suppressing angiogenesis or by directly inhibiting tumor cell growth (7,8). It also is found in several biological fluids where it is known primarily as ASF. It suppresses fluid secretion in response to enterotoxin and may act as an anti-inflammatory factor (9-11).

  1. Nilsson, L.A. et al. (1992) J. Parasitol. 78:1055.
  2. Young, P. et al. (1998) J. Biol. Chem. 273:5461.
  3. Zhou, J. et al. (2004) J. Cell. Biochem. 92:125.
  4. Walters, K.J. et al. (2002) Biochemistry 41:1767.
  5. Rani, N. et al. (2011) Nature Commun. 3:749.
  6. Kim, H.T. & A.L. Goldberg (2012) Methods Mol. Biol. 832:653.
  7. Sabherwal, Y. et al. (2006) Exp. Cell Res. 312:2443.
  8. Godek, J. et al. (2011) Exp. Mol. Pathol. 90:244.
  9. Davidson, T.S. & W.J. Hickey (2004) J. Leukoc. Biol. 76:835.
  10. Davidson, T.S. & W.J. Hickey (2004) Lab. Invest. 84:307.
  11. Ulgheri, C. et al. (2010) Nutr. Res. Rev. 23:300.
Long Name
26S Proteasome Regulatory Subunit S5a
Entrez Gene IDs
5710 (Human); 19185 (Mouse); 83499 (Rat)
Alternate Names
Angiocidin; ASF; Macropain; Mcb1; PSMD4; pUB-R5; Rpn10 ; S5a

Citation for Recombinant Human S5a/Angiocidin Biotin 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.

1 Citation: Showing 1 - 1

  1. S5a binds to death receptor-6 to induce THP-1 monocytes to differentiate through the activation of the NF-kappaB pathway.
    Authors: Wang Z, Fan C, Zhou H, Lu J, Sun M, Song J, Le Y, Jiang H, Wang L, Jiao B
    J Cell Sci, 2014;127(0):3257-68.
    Species: Human
    Sample Types: Whole Cells
    Applications: Bioassay


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