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  • 1
    Publication Date: 2012-12-14
    Description: The clinical efficacy and safety of a drug is determined by its activity profile across many proteins in the proteome. However, designing drugs with a specific multi-target profile is both complex and difficult. Therefore methods to design drugs rationally a priori against profiles of several proteins would have immense value in drug discovery. Here we describe a new approach for the automated design of ligands against profiles of multiple drug targets. The method is demonstrated by the evolution of an approved acetylcholinesterase inhibitor drug into brain-penetrable ligands with either specific polypharmacology or exquisite selectivity profiles for G-protein-coupled receptors. Overall, 800 ligand-target predictions of prospectively designed ligands were tested experimentally, of which 75% were confirmed to be correct. We also demonstrate target engagement in vivo. The approach can be a useful source of drug leads when multi-target profiles are required to achieve either selectivity over other drug targets or a desired polypharmacology.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3653568/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3653568/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Besnard, Jeremy -- Ruda, Gian Filippo -- Setola, Vincent -- Abecassis, Keren -- Rodriguiz, Ramona M -- Huang, Xi-Ping -- Norval, Suzanne -- Sassano, Maria F -- Shin, Antony I -- Webster, Lauren A -- Simeons, Frederick R C -- Stojanovski, Laste -- Prat, Annik -- Seidah, Nabil G -- Constam, Daniel B -- Bickerton, G Richard -- Read, Kevin D -- Wetsel, William C -- Gilbert, Ian H -- Roth, Bryan L -- Hopkins, Andrew L -- 083481/Wellcome Trust/United Kingdom -- BB/FOF/PF/15/09/Biotechnology and Biological Sciences Research Council/United Kingdom -- BB/J010510/1/Biotechnology and Biological Sciences Research Council/United Kingdom -- MH082441/MH/NIMH NIH HHS/ -- R01 DA017204/DA/NIDA NIH HHS/ -- R01 MH061887/MH/NIMH NIH HHS/ -- U19 MH082441/MH/NIMH NIH HHS/ -- WT 083481/Wellcome Trust/United Kingdom -- England -- Nature. 2012 Dec 13;492(7428):215-20. doi: 10.1038/nature11691.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dundee DD1 5EH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23235874" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Automation ; Drug Delivery Systems ; *Drug Design ; Female ; *Ligands ; Male ; Mice ; Mice, Inbred C57BL ; Models, Theoretical ; Pharmacological Phenomena ; Reproducibility of Results
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2015-03-01
    Description: The unwinding of nucleic acid secondary structures within cells is crucial to maintain genomic integrity and prevent abortive transcription and translation initiation. DHX36, also known as RHAU or G4R1, is a DEAH-box ATP-dependent helicase highly specific for DNA and RNA G-quadruplexes (G4s). A fundamental mechanistic understanding of the interaction between helicases and their G4 substrates is important to elucidate G4 biology and pave the way toward G4-targeted therapies. Here we analyze how the thermodynamic stability of G4 substrates affects binding and unwinding by DHX36. We modulated the stability of the G4 substrates by varying the sequence and the number of G-tetrads and by using small, G4-stabilizing molecules. We found an inverse correlation between the thermodynamic stability of the G4 substrates and rates of unwinding by DHX36. In stark contrast, the ATPase activity of the helicase was largely independent of substrate stability pointing toward a decoupling mechanism akin to what has been observed for many double-stranded DEAD-box RNA helicases. Our study provides the first evidence that DHX36 uses a local, non-processive mechanism to unwind G4 substrates, reminiscent of that of eukaryotic initiation factor 4A (eIF4A) on double-stranded substrates.
    Print ISSN: 0305-1048
    Electronic ISSN: 1362-4962
    Topics: Biology
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