6r1s
EthR ligand complex
Structural highlights
FunctionETHR_MYCTU Involved in the repression of the monooxygenase EthA which is responsible of the formation of the active metabolite of ethionamide (ETH).[1] [2] Publication Abstract from PubMedTranscriptional repressor EthR from Mycobacterium tuberculosis is a valuable target for antibiotic booster drugs. We previously reported a virtual screening campaign to identify EthR inhibitors for development. Two ligand binding orientations were often proposed, though only the top scoring pose was utilized for filtering of the large data set. We obtained biophysically validated hits, some of which yielded complex crystal structures. In some cases, the crystallized binding mode and top scoring mode agree, while for others an alternate ligand binding orientation was found. In this contribution, we combine rigid docking, molecular dynamics simulations, and the linear interaction energy method to calculate binding free energies and derive relative binding energies for a number of EthR inhibitors in both modes. This strategy allowed us to correctly predict the most favorable orientation. Therefore, this widely applicable approach will be suitable to triage multiple binding modes within EthR and other potential drug targets with similar characteristics. Relative Binding Energies Predict Crystallographic Binding Modes of Ethionamide Booster Lead Compounds.,Tatum NJ, Duarte F, Kamerlin SCL, Pohl E J Phys Chem Lett. 2019 May 2;10(9):2244-2249. doi: 10.1021/acs.jpclett.9b00741., Epub 2019 Apr 23. PMID:30965004[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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