Biological and structural characterization of the Mycobacterium smegmatis nitroreductase NfnB, and its role in benzothiazinone resistance
| Autor: | Henrieta Škovierová, Maria Rosalia Pasca, Stewart T. Cole, Anna Milano, Giulia Degiacomi, Giovanna Riccardi, Petronela Dianišková, Laurent R. Chiarelli, Marco Bellinzoni, Vadim Makarov, Ana Luisa de Jesus Lopes Ribeiro, Giulia Manina, Jozef Marák, David Giganti, Edda De Rossi, Anna Paola Lucarelli, Katarína Mikušová, Pedro M. Alzari, Ahmed Haouz, Silvia Buroni, Aurora Piazza, Elena A. Salina, João Neres |
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| Rok vydání: | 2010 |
| Předmět: |
0303 health sciences
biology 030306 microbiology medicine.drug_class Mycobacterium smegmatis Flavin mononucleotide biology.organism_classification Antimycobacterial Microbiology 3. Good health Mycobacterium tuberculosis 03 medical and health sciences chemistry.chemical_compound Nitroreductase Protein structure chemistry Biochemistry Docking (molecular) medicine Molecular Biology Gene knockout 030304 developmental biology |
| Zdroj: | Molecular Microbiology. 77:1172-1185 |
| ISSN: | 0950-382X |
| Popis: | Summary Tuberculosis is still a leading cause of death in developing countries, for which there is an urgent need for new pharmacological agents. The synthesis of the novel antimycobacterial drug class of benzothiazinones (BTZs) and the identification of their cellular target as DprE1 (Rv3790), a component of the decaprenylphosphoryl-beta-d-ribose 2'-epimerase complex, have been reported recently. Here, we describe the identification and characterization of a novel resistance mechanism to BTZ in Mycobacterium smegmatis. The overexpression of the nitroreductase NfnB leads to the inactivation of the drug by reduction of a critical nitro-group to an amino-group. The direct involvement of NfnB in the inactivation of the lead compound BTZ043 was demonstrated by enzymology, microbiological assays and gene knockout experiments. We also report the crystal structure of NfnB in complex with the essential cofactor flavin mononucleotide, and show that a common amino acid stretch between NfnB and DprE1 is likely to be essential for the interaction with BTZ. We performed docking analysis of NfnB-BTZ in order to understand their interaction and the mechanism of nitroreduction. Although Mycobacterium tuberculosis seems to lack nitroreductases able to inactivate these drugs, our findings are valuable for the design of new BTZ molecules, which may be more effective in vivo. |
| Databáze: | OpenAIRE |
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