A Small Molecule Binding to the Coactivator CREB-Binding Protein Blocks Apoptosis in Cardiomyocytes
作者:Jagat C. Borah、Shiraz Mujtaba、Ioannis Karakikes、Lei Zeng、Michaela Muller、Jigneshkumar Patel、Natasha Moshkina、Keita Morohashi、Weijia Zhang、Guillermo Gerona-Navarro、Roger J. Hajjar、Ming-Ming Zhou
DOI:10.1016/j.chembiol.2010.12.021
日期:2011.4
As a master transcription factor in cellular responses to external stress, tumor suppressor p53 is tightly regulated. Excessive p53 activity during myocardial ischemia causes irreversible cellular injury and cardiomyocyte death. p53 activation is dependent on lysine acetylation by the lysine acetyltransferase and transcriptional coactivator CREB-binding protein (CBP) and on acetylation-directed CBP recruitment for p53 target gene expression. Here, we report a small molecule ischemin, developed with a structure-guided approach to inhibit the acetyl-lysine binding activity of the bromodomain of CBP. We show that ischemin alters post-translational modifications on p53 and histones, inhibits p53 interaction with CBP and transcriptional activity in cells, and prevents apoptosis in ischemic cardiomyocytes. Our study suggests small molecule modulation of acetylation-mediated interactions in gene transcription as a new approach to therapeutic interventions of human disorders such as myocardial ischemia.
Chiral-auxiliary-mediated 1,2-cis-glycosylations for the solid-supported synthesis of a biologically important branched α-glucan
作者:Thomas J. Boltje、Jin-Hwan Kim、Jin Park、Geert-Jan Boons
DOI:10.1038/nchem.663
日期:2010.7
Solid-phase oligosaccharidesynthesis offers the promise of providing libraries of oligosaccharides for glycomics research. A major stumbling block to solid-phase oligosaccharidesynthesis has been a lack of general methods for the stereoselective installation of 1,2-cis-glycosides, and intractable mixtures of compounds are obtained if several such glycosides need to be installed. We have prepared