Design,synthesis and evaluation against Mycobacterium tuberculosis of azole piperazine derivatives as dicyclotyrosine (cYY) mimics |
| |
Authors: | Hend A.A. Abd El-wahab Mauro Accietto Leonardo B. Marino Kirsty J. McLean Colin W. Levy Hamdy M. Abdel-Rahman Mahmoud A. El-Gendy Andrew W. Munro Ahmed S. Aboraia Claire Simons |
| |
Affiliation: | 1. School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Cardiff CF10 3NB, Wales, UK;2. Department of Medicinal Chemistry, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt;3. Department of Life Sciences, University of Modena and Reggio Emilia, Via G. Campi 183, 41125 Modena, Italy;4. Faculty of Pharmaceutical Sciences, UNESP – Univ Estadual Paulista, Araraquara, São Paulo 14801-902, Brazil;5. Manchester Institute of Biotechnology, School of Chemistry, University of Manchester, Manchester M1 7DN, UK |
| |
Abstract: | Three series of azole piperazine derivatives that mimic dicyclotyrosine (cYY), the natural substrate of the essential Mycobacterium tuberculosis cytochrome P450 CYP121A1, were prepared and evaluated for binding affinity and inhibitory activity (MIC) against M. tuberculosis. Series A replaces one phenol group of cYY with a C3-imidazole moiety, series B includes a keto group on the hydrocarbon chain preceding the series A imidazole, whilst series C explores replacing the keto group of the piperidone ring of cYY with a CH2-imidazole or CH2-triazole moiety to enhance binding interaction with the heme of CYP121A1. The series displayed moderate to weak type II binding affinity for CYP121A1, with the exception of series B 10a, which displayed mixed type I binding. Of the three series, series C imidazole derivatives showed the best, although modest, inhibitory activity against M. tuberculosis (17d MIC?=?12.5?μg/mL, 17a 50?μg/mL). Crystal structures were determined for CYP121A1 bound to series A compounds 6a and 6b that show the imidazole groups positioned directly above the haem iron with binding between the haem iron and imidazole nitrogen of both compounds at a distance of 2.2?Å. A model generated from a 1.5?Å crystal structure of CYP121A1 in complex with compound 10a showed different binding modes in agreement with the heterogeneous binding observed. Although the crystal structures of 6a and 6b would indicate binding with CYP121A1, the binding assays themselves did not allow confirmation of CYP121A1 as the target. |
| |
Keywords: | Dicyclotyrosine derivatives CYP121A1 Binding affinity Molecular modeling X-ray crystallography |
本文献已被 ScienceDirect 等数据库收录! |
|