Ubiquitin E3 ligases (EC 6.3.2.19) attach ubiquitin molecules onto lysine residues of proteins in order to target the protein for a specific cellular process, such as proteasomal degradation or an alteration in subcellular localization.
Ubiquitin E3 Ligase Inhibitors |
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Cat. No. | Product Name / Activity |
5397 | A01 |
High affinity Smurf1 inhibitor; enhances BMP signaling | |
5747 | Apcin |
Cdc20 inhibitor; inhibits Cdc20-substrate interaction | |
7715 | C25-140 |
TRAF6-Ubc13 interaction inhibitor | |
7089 | CSN5i-3 |
Potent and selective CSN5 (COP9 signalosome) inhibitor | |
5636 | GS 143 |
β-TrCP1 ligase inhibitor | |
5433 | Heclin |
HECT E3 ubiquitin ligase inhibitor | |
3503 | HLI 373 |
Hdm2 inhibitor; activates p53-dependent transcription | |
6904 | Idasanutlin |
Potent MDM2 inhibitor; inhibits MDM2-p53 interaction | |
7289 | Nimbolide |
RNF114 inhibitor | |
3984 | Nutlin-3 |
MDM2 antagonist; inhibits MDM2-p53 interaction | |
6075 | Nutlin 3a |
MDM2 antagonist; active enantiomer of Nutlin-3 (Cat. No. 3984) | |
5047 | PRT 4165 |
Inhibitor of Bmi1/Ring1A; blocks histone H2A ubiquitination | |
5191 | PTC 209 |
Bmi-1 inhibitor; antitumor | |
2443 | RITA |
MDM2-p53 interaction inhibitor | |
7542 | SJ 1008066 |
MAGE-A11 inhibitor disrupts MAGE-A11:PCF11 interaction | |
4375 | SMER 3 |
Selective inhibitor of E3 ubiquitin ligase | |
7192 | SMIP 004 |
SKP2 (S-phase kinase-associated protein 2) inhibitor; upregulates p27 and arrests cell cycle in G1 phase | |
5332 | SP 141 |
High affinity MDM2 inhibitor | |
7498 | SPOP-i-6lc |
SPOP E3 ubiquitin ligase inhibitor | |
5076 | SZL P1-41 |
Selective Skp2 inhibitor; suppresses E3 ligase activity | |
0652 | Thalidomide |
Binds cereblon; also TNF-α synthesis inhibitor | |
7774 | VH 032 New |
Inhibitor of VHL; blocks interaction of VHL and HIF-α | |
6156 | VH 298 |
High-affinity inhibitor of VHL | |
7055 | WS 383 |
Potent, selective and reversible DCN1-UBC12 interaction inhibitor | |
6719 | YH 239-EE |
MDM2 inhibitor; disrupts MDM2-p53 interaction | |
Ligands |
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Cat. No. | Product Name / Activity |
7476 | EN 219 |
Covalent RNF114 ligand | |
Degraders |
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Cat. No. | Product Name / Activity |
6416 | CM 11 |
Homo-PROTAC® for self-degradation of pVHL30 | |
7219 | CRBN PROTAC® 14a |
Cereblon Degrader (PROTAC®) | |
6948 | CRBN-6-5-5-VHL |
Potent and selective cereblon Degrader; cell-permeable | |
Controls |
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Cat. No. | Product Name / Activity |
6157 | cis VH 298 |
Negative control for VH 298 | |
7532 | CSN5i-3-NEG |
Negative control for CSN5i-3 (Cat. No. 7089) | |
7716 | N-methylated pomalidomide |
Pomalidomide negative control; also functionalized cereblon ligand for generating Degrader negative controls | |
Other |
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Cat. No. | Product Name / Activity |
7633 | BDY FL Thalidomide New |
High affinity fluorescent probe for TR-FRET cereblon binding assay | |
7483 | BDY FL VH032 |
High-affinity VHL fluorescent probe for TR-FRET and FP assays | |
7287 | FAM-DEALA-Hyp-YIPD |
Fluorescent HIF-1α peptide; can be used to evaluate the effect of VHL binding on degradation activity | |
7452 | FAM-DEALAHypYIPMDDDFQLRSF |
Fluorescent HIF-1α peptide; can be used to evaluate the effect of VHL binding on degradation activity | |
7627 | FITC-labelled Keap1-Nrf2 probe |
Fluorescent Keap1-Nrf2 peptide | |
6782 | Indisulam |
Molecular glue; pre-mRNA splicing modulator | |
6305 | Lenalidomide |
Cereblon binder; induces ubiquitination and degradation of CK1α by E3 ubiquitin ligase | |
5131 | NAB 2 |
Protects against α-synuclein toxicity; promotes Rsp5/Nedd4-dependent endosomal transport | |
6302 | Pomalidomide |
Cereblon binder; also TNF-α inhibitor and antiangiogenic | |
7288 | Thalidomide-Cyanine 5 |
High affinity cereblon fluorescent probe |
Ubiquitin E3 ligases (EC 6.3.2.19) attach ubiquitin molecules onto lysine residues of proteins in order to target the protein for a specific cellular process, such as proteasomal degradation or an alteration in subcellular localization. In addition to the specific ubiquitin ligases such as MDM2, E3A and anaphase-promoting complex (APC), many other proteins also contain domains that possess ubiquitin ligase activity. Almost all known ubiquitin E3 ligases contain one of three domains: a HECT, RING or A20-type zinc finger domain. Hundreds of E3 ligases have been identified so far, and their relative abundance in comparison to E1 and E2 enzymes is thought to confer specificity to the process of ubiquitination.
Ubiquitin ligases function in a complex with an E1-activating enzyme, an E2-conjugating enzyme and an E3 ubiquitin ligase. Using ATP, E1 activates the ubiquitin molecule and transfers it to E2. E2 interacts with E3 partners to transfer the ubiquitin moeity to the target protein. Generally multiple ubiquitin molecules are attached to a protein, in a process known as polyubiquitination, but the addition of single ubiquitin molecules ('monoubiquitination') may also occur within cells.
The ubiquitin ligase MDM2 is best known for its negative regulation of the tumor suppressor p53. It does this in two ways: by binding the N-terminal of p53 and inhibiting transcriptional activation; and by targeting p53 for degradation by the 26S proteasome. The latter is accomplished by polyubiquitination of p53, a consequence of MDM2's E3 ubiquitin ligase activity. Due to its inhibition of tumor suppressor activity, MDM2 is considered to be an oncoprotein, and therefore a cancer target. MDM2 may also ubiquitinate itself, though this can be reversed by the activity of USP7 (ubiquitin-specific protease 7). When DNA damage is evident, however, MDM2 is phosphorylated by ATM kinase; this lowers its affinity for USP7, permits its proteasomal degradation, and enables p53-mediated DNA repair.
Tocris offers the following scientific literature for Ubiquitin E3 Ligases to showcase our products. We invite you to request* your copy today!
*Please note that Tocris will only send literature to established scientific business / institute addresses.
This brochure highlights the tools and services available from Bio-Techne to support Targeted Protein Degradation research, including:
There are two currently recognized forms of programmed cell death: apoptosis and necroptosis. This poster summarizes the signaling pathways involved in apoptosis, necroptosis and cell survival following death receptor activation, and highlights the influence of the molecular switch, cFLIP, on cell fate.
Degraders (e.g. PROTACs) are bifunctional small molecules, that harness the Ubiquitin Proteasome System (UPS) to selectively degrade target proteins within cells. They consist of three covalently linked components: an E3 ubiquitin ligase ligand, a linker and a ligand for the target protein of interest. Authored in-house, this poster outlines the generation of a toolbox of building blocks for the development of Degraders. The characteristics and selection of each of these components are discussed. Presented at EFMC 2018, Ljubljana, Slovenia