Identification of a novel BCL2-specific inhibitor that binds predominantly to the BH1 domain
摘要:
The antiapoptotic protein BCL2 is overexpressed in several cancers and contributes to prolonged cell survival and chemoresistance, lending itself as an excellent target for cancer therapy. Here, we report the design, synthesis, and characterization of Disarib, a novel BCL2 inhibitor. Disarib showed selective cytotoxicity in BCL2 high cancer cell lines, and CLL patient primary cells, as compared to BCL2 low cell lines. BCL2 knockdown in cells rendered remarkable resistance to Disarib, while sensitivity was regained upon its ectopic expression, establishing target specificity. In silico, biochemical and biophysical studies demonstrated strong affinity of Disarib to BCL2, but not to other antiapoptotic BCL2 family members viz., BCL‐xL, BCL2A1 etc. Interestingly, biophysical studies showed that BH1 domain deletion mutant demonstrated ~ 67‐fold reduction in BCL2‐Disarib interaction, while it was only ~ 20‐fold in the case of BH3 deletion mutant, suggesting predominant involvement of the BH1 domain for Disarib binding. Thus, we report identification of a novel BCL2 inhibitor with a unique mechanism of BCL2 inhibition, as opposed to the well‐studied BH3 domain targeting.
Potassium Carbonate-Mediated Green and Efficient Synthesis of Imidazo[2,1-<i>b</i>]-1,3,4-thiadiazoles Using PEG as Solvent
作者:Mazaahir Kidwai、Divya Bhatnagar、Ritika Chauhan
DOI:10.1002/jhet.1037
日期:2013.2
Polyethylene glycol (PEG) was found to be an inexpensive nontoxic and effective medium for the synthesis of imidazo[2,1-b]-1,3,4-thiadiazoles in the presence of potassium carbonate as a green base in high yields. In addition, the solvent system can be recovered and reused, making this protocol economically and potentially viable.
聚乙二醇(PEG)被发现是一种廉价的无毒,有效的介质,可在存在下列条件下合成咪唑并[2,1 - b ] -1,3,4-噻二唑。碳酸钾为绿色碱,高产。另外,溶剂系统可以回收和再利用,从而使该方案在经济上和潜在可行。
Synthesis of Imidazo[2,1-<i>b</i>]-1,3,4-thiadiazoles in DABCO as an Efficient and Recyclable Catalyst
An efficient and general method has been described for the synthesis of imidazo[2,1-b]-1,3,4-thiadiazole by the reaction of 2-aminothiadiazoles with phenacyl bromides in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO). The method is suitable for the synthesis of functionalized imidazothiadiazoles.
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