FBXO21 Inhibitors
Chemical inhibitors of FBXO21 function through different mechanisms to impede the protein's role in the ubiquitination process. MLN4924 targets the NEDD8-activating enzyme, essential for the neddylation that activates the SCF complex, where FBXO21 is a component, thus indirectly inhibiting FBXO21's ability to tag proteins for degradation. Similarly, compounds such as Pyr41 and IX 207-887 inhibit the E1 ubiquitin-activating enzyme, which is crucial for the initiation of the ubiquitination cascade. By halting this initial step, these inhibitors prevent FBXO21 from tagging substrates with ubiquitin. TAK-243 also inhibits the E1 enzyme, leading to a blockade of ubiquitin activation and subsequent interference with the ubiquitination process involving FBXO21.
On the other hand, several inhibitors focus on the proteasome to indirectly affect FBXO21 activity. Compounds such as MG132, Lactacystin, Bortezomib (also known as Velcade), Epoxomicin, Carfilzomib, and Oprozomib prevent the degradation of polyubiquitinated proteins by inhibiting the proteasome. This inhibition results in the accumulation of FBXO21 substrates within the cell. The increased levels of these substrates can lead to an indirect suppression of FBXO21's function as part of the cell's regulatory feedback mechanisms. By blocking the final step in the ubiquitin-proteasome pathway, these inhibitors ensure that proteins marked by FBXO21 are not degraded, thereby influencing the activity of FBXO21 by the buildup of its intended targets. Clasto-Lactacystin β-lactone, the active form of Lactacystin, similarly binds to the proteasomal subunit and irreversibly inhibits its activity, leading to the same effect on the feedback regulation of FBXO21.
SEE ALSO...
| Product Name | CAS # | Catalog # | QUANTITY | Price | Citations | RATING |
|---|---|---|---|---|---|---|
MLN 4924 | 905579-51-3 | sc-484814 | 1 mg | $286.00 | 1 | |
MLN4924 inhibits NEDD8-activating enzyme (NAE), which is essential for the neddylation process. Since FBXO21 is part of the SCF (SKP1-CUL1-F-box protein) E3 ubiquitin ligase complex that relies on neddylation for its full activity, inhibition of NEDD8 by MLN4924 leads to the suppression of FBXO21's function in protein ubiquitination. | ||||||
Ubiquitin E1 Inhibitor, PYR-41 | 418805-02-4 | sc-358737 | 25 mg | $360.00 | 4 | |
Pyr41 is a specific inhibitor of the ubiquitin-activating enzyme E1. FBXO21 functions as a part of the ubiquitin-proteasome system, and by inhibiting the upstream E1 enzyme, Pyr41 effectively blocks the ubiquitination cascade, thus preventing FBXO21 from tagging substrates with ubiquitin for degradation. | ||||||
MG-132 [Z-Leu- Leu-Leu-CHO] | 133407-82-6 | sc-201270 sc-201270A sc-201270B | 5 mg 25 mg 100 mg | $60.00 $265.00 $1000.00 | 163 | |
MG132 is a proteasome inhibitor that prevents the degradation of polyubiquitinated proteins. Although it does not inhibit FBXO21 directly, by preventing substrate degradation, MG132 can lead to the accumulation of FBXO21 substrates, which may inhibit the function of FBXO21 by feedback inhibition as part of a regulatory mechanism within the cell. | ||||||
Lactacystin | 133343-34-7 | sc-3575 sc-3575A | 200 µg 1 mg | $188.00 $575.00 | 60 | |
Lactacystin is another proteasome inhibitor that irreversibly binds to the proteasomal subunit and inhibits its activity. Similar to MG132, it causes the accumulation of FBXO21 substrates, potentially leading to the inhibition of FBXO21 activity through substrate feedback. | ||||||
Bortezomib | 179324-69-7 | sc-217785 sc-217785A | 2.5 mg 25 mg | $135.00 $1085.00 | 115 | |
Bortezomib specifically inhibits the 26S proteasome. By doing so, it prevents the degradation of ubiquitinated proteins, which could lead to an indirect inhibition of FBXO21 by allowing the accumulation of its substrates, which might inhibit FBXO21's activity through a negative feedback loop. | ||||||
Epoxomicin | 134381-21-8 | sc-201298C sc-201298 sc-201298A sc-201298B | 50 µg 100 µg 250 µg 500 µg | $137.00 $219.00 $449.00 $506.00 | 19 | |
Epoxomicin is a selective proteasome inhibitor. By blocking the degradation of ubiquitinated proteins, it indirectly inhibits FBXO21 by increasing the levels of its substrates, which may in turn inhibit the activity of FBXO21 through a built-in cellular feedback mechanism. | ||||||
Carfilzomib | 868540-17-4 | sc-396755 | 5 mg | $41.00 | ||
Carfilzomib irreversibly inhibits the proteasome activity. While it does not directly inhibit FBXO21, it impedes the degradation of its ubiquitinated substrates, which can cause an accumulation that may lead to the inhibition of FBXO21's function in a feedback regulatory manner. | ||||||
MLN7243 | 1450833-55-2 | sc-507338 | 5 mg | $340.00 | ||
TAK-243 is a ubiquitin-activating enzyme E1 inhibitor. By inhibiting the E1 enzyme, TAK-243 prevents the activation of ubiquitin, thereby blocking the ubiquitination process in which FBXO21 is involved, leading to its functional inhibition. | ||||||
Oprozomib | 935888-69-0 | sc-477447 | 2.5 mg | $280.00 | ||
Oprozomib is a proteasome inhibitor that impedes the breakdown of ubiquitinated protein substrates. This inhibition could lead to an indirect inhibition of FBXO21 by the accumulation of polyubiquitinated proteins, potentially causing feedback inhibition of its ubiquitin ligase activity. | ||||||