Ali Tavassoli's Publications and Citation Metrics
The main focus of the Tavassoli lab has been the establishment and utilization of a genetically encoded high-throughput screening platform for the identification of protein-protein interaction inhibitors.
Some of the projects currently underway in the lab are highlighted below.
The first specific inhibitor of HIF-1α/HIF-1β protein-protein interaction
Miranda E. et al., Journal of the American Chemical Society, 2013, 135 (28), 10418-10425.
Asby D. J. et al., Molecular Biosystems, 2014, 10 (10), 2505-2508.
HIF-1 is the cellular sensor of oxygen, and a key protein in the adaptation and survival of cancer cells in the hypoxic tumour microenvironment. We have recently reported the first specific inhibitor of HIF1α/HIF-1β dimerization. The inhibitor was identified using our bacterial high-throughput screening platform, and was extensively characterized in vitro and in cells, and shown to inhibit hypoxia-response signaling in cells. We also demonstrated that the compound does not disrupt the dimerization of HIF-2α/HIF-1β in vitro and in cells.
This work has generated significant interest in the media, including the CRUK blog.
This work is funded by Cancer Research UK
The first example of a non-natural, biocompatible DNA-backbone linker (with Prof. Tom Brown)
Birts C.N. et al., Angewandte Chemie, 2014, 53 (9), 2362-2365.
Sanzone A.P. et al., Nucleic Acids research, 2012, 40 (20), 10567-10575.
El-Sagheer A.H. et al., Proceedings of the National Academy of Science, 2011, 108 (28), 11338-11343.
Current DNA synthesis methods do not allow the preparation of epigenetically modified DNA fragments larger than ~200 bases (methods such as PCR use enzymes that can not read epigenetic information, and so any epigenetic information incorporated at the oligonucleotide synthesis stage will be erased in the amplified, assembled DNA). We are therefore seeking to establish a chemical method for DNA ligation that would allow assembly of synthetic oligonucleotides by a purely chemical method. This would allow the synthesis of large oligonucleotides (genes and genomes) that contain epigenetic information, and provide a significant tool for the study of epigenetics.
A key requirement for the above is the biocompatibility of the resulting non-natural DNA linker in living systems. We have assesses the suitability of click-linked DNA for this purpose; modified bases were incorporated at the appropriate termini of oligonucleotides, and linked by click chemistry. We have recently shown that the resulting non-natural triazole linked (replacing the phosphodiester normally present in DNA) is fully biocompatible in E. coli and mammalian cells.
This work is funded by the BBSRC and EPSRC.
The first inhibitor of CtBP homodimerization (with Dr. Jeremy Blaydes)
Birts C.N. et al., Chemical Science, 2013, 4 (8), 3046-3057.
C-termina binding proteins are transcriptional regulators that dimerize in response to increased NADH levels, and modulate the gene expression. We used our high-throughput screening platform to identify cyclic peptide inhibitors of CtBP dimerization, and used these sompounds to show metabolic regulation of cell cycle fidelity in cancer cells. This paper was featured on the cover of the journal Chemical Science.
This work is funded by Cancer Research UK and Breast Cancer Campaign.
Chemical Biology, Diagnostics and Therapeutics
Professor Ali Tavassoli
Chemistry University of Southampton Highfield Southampton SO17 1BJ
Room Number: 30/
Telephone: (023) 8059 2395