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Narasimhan K.,Genome Institute of Singapore | Narasimhan K.,National University of Singapore | Pillay S.,Nanyang Technological University | Bin Ahmad N.R.,Genome Institute of Singapore | And 7 more authors.
ACS Chemical Biology | Year: 2011

Aberrant expression of transcription factors is a frequent cause of disease, yet drugs that modulate transcription factor protein-DNA interactions are presently unavailable. To this end, the chemical tractability of the DNA binding domain of the stem cell inducer and oncogene Sox2 was explored in a high-throughput fluorescence anisotropy screen. The screening revealed a Dawson polyoxometalate (K 6[P 2Mo 18O 62]) as a direct and nanomolar inhibitor of the DNA binding activity of Sox2. The Dawson polyoxometalate (Dawson-POM) was found to be selective for Sox2 and related Sox-HMG family members when compared to unrelated paired and zinc finger DNA binding domains. [ 15N, 1H]-Transverse relaxation optimized spectroscopy (TROSY) experiments coupled with docking studies suggest an interaction site of the POM on the Sox2 surface that enabled the rationalization of its inhibitory activity. The unconventional molecular scaffold of the Dawson-POM and its inhibitory mode provides strategies for the development of drugs that modulate transcription factors. © 2011 American Chemical Society.

Hazai E.,Virtua Drug Research and Development Ltd. | Hazai I.,Virtua Drug Research and Development Ltd. | Demko L.,Virtua Drug Research and Development Ltd. | Kovacs S.,Virtua Drug Research and Development Ltd. | And 8 more authors.
Journal of Computer-Aided Molecular Design | Year: 2010

Cyclodextrins are cyclic oligosaccharides that are able to form water-soluble inclusion complexes with small molecules. Because of their complexing ability, they are widely applied in food, pharmaceutical and chemical industries. In this paper we describe the development of a free web-service, Cyclodextrin KnowledgeBase: ( http://www.cyclodextrin.net ). The database contains four modules: the Publication, Interaction, Chirality and Analysis Modules. In the Publication Module, almost 50,000 publication details are collected that can be retrieved by text search. In the Interaction and Chirality Modules relevant literature data on cyclodextrin complexation and chiral recognition are collected that can be retrieved by both text and structural searches. Moreover, in the Analysis Module, the geometries of small molecule-cyclodextrin complexes can be predicted using molecular docking tools in order to explore the structures and interaction energies of the inclusion complexes. Complex geometry prediction is made possible by the built-in database of 95 cyclodextrin derivatives, where the 3D structures as well as the partial charges are calculated and stored for further utilization. The use of the database is demonstrated by several examples. © 2010 Springer Science+Business Media B.V.

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