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Synthesis and biological evaluation of novel cYY analogues targeting Mycobacterium tuberculosis CYP121A1
Authors:Safaa M. Kishk  Kirsty J. McLean  Sakshi Sood  Mohamed A. Helal  Mohamed S. Gomaa  Ismail Salama  Samia M. Mostafa  Luiz Pedro S. de Carvalho  Andrew W. Munro  Claire Simons
Affiliation:1. School of Pharmacy & Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK;2. Medicinal Chemistry Department, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt;3. Manchester Institute of Biotechnology, School of Chemistry, The University of Manchester, 131 Princess Street, Manchester M1 7DN, UK;4. Mycobacterial Metabolism and Antibiotic Research Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK;5. Biomedical Sciences Program, University of Science and Technology, Zewail City of Science and Technology, Giza 12588, Egypt;6. Department of Chemistry, College of Clinical Pharmacy, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
Abstract:The rise in multidrug resistant (MDR) cases of tuberculosis (TB) has led to the need for the development of TB drugs with different mechanisms of action. The genome sequence of Mycobacterium tuberculosis (Mtb) revealed twenty different genes coding for cytochrome P450s. CYP121A1 catalyzes a C/>C crosslinking reaction of dicyclotyrosine (cYY) producing mycocyclosin and current research suggests that either mycocyclosin is essential or the overproduction of cYY is toxic to <em>Mtb</em>. A series of 1,4-dibenzyl-2-imidazol-1-yl-methylpiperazine derivatives were designed and synthesised as cYY mimics. The derivatives substituted in the 4-position of the phenyl rings with halides or alkyl group showed promising antimycobacterial activity (MIC 6.25?μg/mL), with the more lipophilic branched alkyl derivatives displaying optimal binding affinity with CYP121A1 (<sup>i</sup>Pr <em>K</em><sub>D</sub>?=?1.6?μM; <sup>t</sup>Bu <em>K</em><sub>D</sub>?=?1.2?μM). Computational studies revealed two possible binding modes within the CYP121A1 active site both of which would effectively block cYY from binding.</td>
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Keywords:CYP121A1  1,4-Dibenzyl-2-imidazol-1-yl-methylpiperazine derivatives  Binding affinity assays  Molecular modelling
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