e2 enzyme (R&D Systems)
Structured Review

E2 Enzyme, supplied by R&D Systems, used in various techniques. Bioz Stars score: 95/100, based on 52 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
https://www.bioz.com/result/e2 enzyme/product/R&D Systems
Average 95 stars, based on 52 article reviews
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1) Product Images from "Regulation of the MDM2-p53 nexus by a nuclear phosphoinositide and small heat shock protein complex"
Article Title: Regulation of the MDM2-p53 nexus by a nuclear phosphoinositide and small heat shock protein complex
Journal: The Journal of Biological Chemistry
doi: 10.1016/j.jbc.2025.110527
Figure Legend Snippet: PIP 2 and sHSPs regulate the ubiquitination function of MDM2. A , for MDM2 autoubiquitination, 100 nM of E1 enzyme, 1 μM of E2 enzyme, 1 μM of MDM2, E3 ligase reaction buffer, 10 mM of MgATP solution and 100 μM of ubiquitin were incubated with different concentrations of αBC, HSP27 (0.9, 1.8, or 2.7 μM), or PIP 2 (10, 20, or 30 μM) for 1 h. Ubiquitin, MDM2, αBC and HSP27 were analyzed by IB, and ubiquitin IBs were quantified. The graphs are shown as mean ± s.d. of n = 3 independent experiments. B , for in vitro ubiquitination, 100 nM of E1 enzyme, 1 μM of E2 enzyme, 1 μM of His- and FLAG-tagged MDM2, E3 ligase reaction buffer, 10 mM of MgATP solution and 100 μM of ubiquitin were incubated with 1 μM of His- and FLAG-tagged p53 for 1 h. For IP, samples were incubated with anti-p53-conjugated agarose overnight. Ubiquitin, MDM2, and p53 were analyzed by IB, and ubiquitin IBs were quantified. The graphs are shown as mean ± s.d. of n = 3 independent experiments. C , MDA-MB-231 cells were transfected with siRNAs for PIPKIα and treated with vehicle or 30 μM cisplatin for 24 h. Empty vector (Mock) was used as a negative control. After cells were treated with 10 μM of MG132 for 4 h, cells were harvested for IP of MDM2 and p53. Expression of the indicated proteins was analyzed by IB, and ubiquitin IBs were quantified. The graph is shown as mean ± s.d. of n = 3 independent experiments. KD, knockdown; UT, untreated; Cis, cisplatin treated; Cis/MG132, Cisplatin/MG132 treated. D , MDA-MB-468 cells were transfected with siRNAs for αBC and HSP27 for 48 h in absence or presence of MG132. Empty vector (Mock) was used as a negative control. Cells were processed for IP of MDM2. IB was used to analyze indicated proteins, and ubiquitin IBs were quantified. The graphs are shown as mean ± s.d. of n = 3 independent experiments. KD, knockdown. E , a model of PIP 2 regulation of the interaction between MDM2 and sHSPs, which differentially control the stability of MDM2 and function of of MDM2. In the presence of PIPKIα, PIP 2 is linked to MDM2, which recruits αBC to MDM2 to stabilize it and enhances p53 binding. Conversely, in the absence of PIPKIα and PIP 2 , HSP27 is recruited to MDM2, which increases the ubiquitin E3 ligase activity of MDM2.
Techniques Used: Ubiquitin Proteomics, Incubation, In Vitro, Transfection, Plasmid Preparation, Negative Control, Expressing, Knockdown, Control, Binding Assay, Activity Assay

