Synthesis and biological evaluation of analogues of butyrolactone I and molecular model of its interaction with CDK2
作者:Miguel F. Braña、M. Luisa García、Berta López、Beatriz de Pascual-Teresa、Ana Ramos、Jose M. Pozuelo、M. Teresa Domínguez
DOI:10.1039/b403052d
日期:——
A series of analogues of butyrolactone I, a natural product isolated from Aspergillus terreus that selectively inhibits the CDK2 and CDK1 kinases and that has been found to exhibit an interesting antiproliferative activity, have been synthesized. Its antitumor activity has been tested. Molecular models of the complex between butyrolactone I and the CDK2 active site have been built using a combination of conformational search and automated docking techniques. The stability of the resulting complexes has been assessed by molecular dynamics simulations and the experimental results obtained for the synthesized analogues are rationalized based on the molecular models.
Design, synthesis, and biological evaluation of substrate-competitive inhibitors of C-terminal Binding Protein (CtBP)
作者:Sudha Korwar、Benjamin L. Morris、Hardik I. Parikh、Robert A. Coover、Tyler W. Doughty、Ian M. Love、Brendan J. Hilbert、William E. Royer、Glen E. Kellogg、Steven R. Grossman、Keith C. Ellis
DOI:10.1016/j.bmc.2016.04.037
日期:2016.6
C-terminal Binding Protein (CtBP) is a transcriptional co-regulator that downregulates the expression of many tumor-suppressor genes. Utilizing a crystal structure of CtBP with its substrate 4-methylthio-2-oxobutyric acid (MTOB) and NAD(+) as a guide, we have designed, synthesized, and tested a series of small molecule inhibitors of CtBP. From our first round of compounds, we identified 2-(hydroxyimino)-3-phenylpropanoic acid as a potent CtBP inhibitor (IC50 = 0.24 mu M). A structure-activity relationship study of this compound further identified the 4-chloro- (IC50 = 0.18 mu M) and 3-chloro- (IC50 = 0.17 mu M) analogues as additional potent CtBP inhibitors. Evaluation of the hydroxyimine analogues in a short-term cell growth/viability assay showed that the 4-chloro- and 3-chloro-analogues are 2-fold and 4-fold more potent, respectively, than the MTOB control. A functional cellular assay using a CtBP-specific transcriptional readout revealed that the 4-chloro- and 3-chloro-hydroxyimine analogues were able to block CtBP transcriptional repression activity. This data suggests that substrate-competitive inhibition of CtBP dehydrogenase activity is a potential mechanism to reactivate tumor-suppressor gene expression as a therapeutic strategy for cancer. (C) 2016 Elsevier Ltd. All rights reserved.
Compounds are provided which are inhibitors of the CAXII enzyme. Due to the interaction between CAXII and Pgp, such compounds may be useful in lowering the chemoresistance of a cancer allowing for co-administration with existing anti-cancer agents.