Abstract
In this study, we have investigated the enzyme shikimate 5-dehydrogenase from the causative agent of tuberculosis, Mycobacterium tuberculosis. We have employed a mixture of computational techniques, including molecular dynamics, hybrid quantum chemical/molecular mechanical potentials, relaxed surface scans, quantum chemical descriptors and free-energy simulations, to elucidate the enzyme’s reaction pathway. Overall, we find a two-step mechanism, with a single transition state, that proceeds by an energetically uphill hydride transfer, followed by an energetically downhill proton transfer. Our mechanism and calculated free energy barrier for the reaction, 64.9 kJ mol− 1, are in good agreement with those predicted from experiment. An analysis of quantum chemical descriptors along the reaction pathway indicated a possibly important, yet currently unreported, role of the active site threonine residue, Thr65.
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Funding
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nivel Superior - Brasil (CAPES) - Finance Code 001. LFSMT acknowledges postdoctoral scholarship awarded by CAPES, and JFRB acknowledges postdoctoral scholarship (DOCFIX) awarded by CAPES and FAPERGS. Instituto Nacional de Ciência e Tecnologia de Nanotecnologia para Marcadores Integrados (INCT-INAMI), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), CAPES, Fundação de Apoio á Pesquisa do Estado da Paraíba (FAPESQ-PB), Programa de Apoio a Núcleos de Excelência (PRONEX-FACEPE), and Financiadora de Estudos e Projetos (FINEP). The authors also acknowledge the physical structure and computational support provided by Universidade Federal da Paraíba (UFPB) and the computer resources of Centro Nacional de Processamento de Alto Desempenho em São Paulo (CENAPAD-SP). This study was financed in part by CAPES through the research project Bioinformática Estrutural de Proteínas: Modelos, Algoritmos e Aplicações Biotecnológicas (Edital Biologia Computacional 51/2013, processo AUXPE1375/2014 da CAPES). G.B.R. acknowledges support from the Brazilian National Council for Scientific and Technological Development (CNPq grant no. 309761/2017-4).
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This paper belongs to Topical Collection XX-Brazilian Symposium of Theoretical Chemistry (SBQT2019)
Igor Barden Grillo and José Fernando Ruggiero Bachega are co-first authors.
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Grillo, I.B., Bachega, J.F.R., Timmers, L.F.S.M. et al. Theoretical characterization of the shikimate 5-dehydrogenase reaction from Mycobacterium tuberculosis by hybrid QC/MM simulations and quantum chemical descriptors. J Mol Model 26, 297 (2020). https://doi.org/10.1007/s00894-020-04536-9
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DOI: https://doi.org/10.1007/s00894-020-04536-9