Activating Compound | Comment | Organism | Structure |
---|---|---|---|
additional information | 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) and O6-benzylguanine facilitate the ubiquitination and degradation of O6-methylguanine-DNA methyltransferase (MGMT) in several types of cancer cells involving the enzyme ubiquitin-conjugating enzyme E2 B. BCNU enhances the interaction between MGMT and UBE2B | Homo sapiens |
Protein Variants | Comment | Organism |
---|---|---|
additional information | enzyme UBE2B knockout, HONE-1 and TW01 cells are transfected specific UBE2B siRNA | Homo sapiens |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | analysis of binding affinity between O6-methylguanine-DNA methyltransferase (MGMT)and E2 ubiquitin conjugating enzymes | Homo sapiens |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
S-ubiquitinyl-[E1 ubiquitin-activating enzyme]-L-cysteine + [E2 ubiquitin-conjugating enzyme]-L-cysteine | Homo sapiens | - |
[E1 ubiquitin-activating enzyme]-L-cysteine + S-ubiquitinyl-[E2 ubiquitin-conjugating enzyme]-L-cysteine | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Homo sapiens | P63146 | - |
- |
Source Tissue | Comment | Organism | Textmining |
---|---|---|---|
HONE-1 cell | - |
Homo sapiens | - |
nasopharyngeal carcinoma cell | - |
Homo sapiens | - |
NPC-TW01 cell | - |
Homo sapiens | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
S-ubiquitinyl-[E1 ubiquitin-activating enzyme]-L-cysteine + [E2 ubiquitin-conjugating enzyme]-L-cysteine | - |
Homo sapiens | [E1 ubiquitin-activating enzyme]-L-cysteine + S-ubiquitinyl-[E2 ubiquitin-conjugating enzyme]-L-cysteine | - |
? |
Synonyms | Comment | Organism |
---|---|---|
RAD6B | - |
Homo sapiens |
UBE2B | - |
Homo sapiens |
ubiquitin-conjugating enzyme E2 B | - |
Homo sapiens |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
37 | - |
assay at | Homo sapiens |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
7.5 | - |
assay at | Homo sapiens |
General Information | Comment | Organism |
---|---|---|
malfunction | overexpression/knockdown of UBE2B enhances/reduces BCNU-mediated O6-methylguanine-DNA methyltransferase (MGMT) ubiquitination. UBE2B knockdown significantly increases 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU)cytotoxicity in NPC cells. Therefore, loss of UBE2B seems to disrupt ubiquitin-mediated degradation of alkylated MGMT. UBE2B knockdown reduces MGMT activity, suggesting that loss of UBE2B leads to the accumulation of deactivated MGMT and suppresses MGMT protein turnover in BCNU-treated cells | Homo sapiens |
physiological function | ubiquitin-conjugating enzyme E2 B (UBE2B) is a regulator of O6-methylguanine-DNA methyltransferase (MGMT) ubiquitination mediated by 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU)in nasopharyngeal carcinoma (NPC) cells. BCNU enhances the interaction between MGMT, RAD18, and ubiquitinated UBE2B. The E3 ubiquitin ligase RAD18, a partner of UBE2B, is also involved in BCNU-mediated MGMT ubiquitination. UBE2B modulates sensitivity to BCNU in NPC cells by regulating MGMT ubiquitination. UBE2B and RAD18 facilitate and accelerate MGMT ubiquitination in vitro, and BCNU and O6-benzylguanine promote UBE2B/RAD18-induced MGMT ubiquitination | Homo sapiens |