Recombinant Human SUMO3 Biotin Protein, CF

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Recombinant Human SUMO3 Biotin Protein, CF Summary

>95%, by PAGE
Biotin-SUMO3 can be conjugated to substrate proteins via the subsequent actions of a SUMO-activating (E1) enzyme and a SUMO-conjugating (E2) enzyme. A SUMO ligase (E3) is sometimes utilized for SUMO conjugation, but is not always required. Biotin-SUMO3 is ideal for the visualization or quantification of thioester formation with avidin-linked reagents. Reaction conditions will need to be optimized for each specific application. We recommend an initial Biotin-SUMO3 concentration of 5-20 μM.
E. coli-derived human SUMO3 protein
Accession #

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.


Shipping The product is shipped with dry ice or equivalent. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Store the unopened product at -70 °C. Use a manual defrost freezer and avoid repeated freeze-thaw cycles. Do not use past expiration date.
Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Background: SUMO3

Human Small Ubiquitin-like Modifier 3 (SUMO3), also known as SMT3A, is synthesized as a 103 amino acid (aa), propeptide with a predicted 11.5 kDa. SUMO3 contains a two aa C-terminal prosegment. Human SUMO3 shares 83% sequence identity with mouse SUMO3. SUMO3 also has high aa sequence homology to SUMO2 and SUMO4, 87% and 75%, respectively. SUMO3 shares only 47% sequence identity with SUMO1. SUMOs are a family of small, related proteins that can be enzymatically attached to a target protein by a post-translational modification process termed SUMOylation (1-3). All SUMO proteins share a conserved Ubiquitin domain and a C-terminal diglycine cleavage/attachment site. Following prosegment cleavage, the C-terminal glycine residue of SUMO3 is enzymatically attached to a lysine residue on a target protein. In humans, SUMO3 is conjugated to a variety of molecules in the presence of the SAE1/UBA2 SUMO-activating (E1) enzyme and the UBE2I/Ubc9 SUMO-conjugating (E2) enzyme (4,5). In yeast, the SUMO-activating (E1) enzyme is Aos1/Uba2p (6). Because of the high level of sequence homology most studies report effects of SUMO2/3. For example, addition of SUMO2/3 was shown to modulate the function of ARHGAP21, a RhoGAP protein known to be involved in cell migration (7). Other reports indicate that the conjugation by SUMO2/3, but not SUMO1, may represent an important mechanism to protect neurons during episodes of cerebral ischemia (8,9). However, studies suggest that SUMO2/3 expression is regulated in an isoform-specific manner since oxidative stress downregulated the transcription of SUMO3 but not SUMO2 (10).

SUMO-3 modified with biotin via primary amine coupling results in modification of lysine residues as well as the N-terminus. Although having a fully functional C-terminus, lysine modification may limit the ability of this reagent to propagate poly-SUMO chains. Biotinylated SUMO-3 can be detected using avidin-linked reagents for higher efficiency and sensitivity than with antibodies.

Long Name
Small Ubiquitin-like Modifier 3
Entrez Gene IDs
6612 (Human)
Alternate Names
SMT3 (suppressor of mif two 3, yeast) homolog 1; SMT3 homolog 1; SMT3 suppressor of mif two 3 homolog 1; SMT3 suppressor of mif two 3 homolog 3 (S. cerevisiae); SMT3 suppressor of mif two 3 homolog 3 (yeast); SMT3A; SMT3B; SMT3H1; SMT3H1small ubiquitin-related modifier 3; SUMO-2; SUMO3; SUMO-3; ubiquitin-like protein SMT3A; Ubiquitin-like protein SMT3B


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