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• W3003875558 abstract "Abstract The multidrug resistance (MDR) system effectively expels antibiotics out of bacteria causing serious issues during bacterial infection. In addition to drug, indole, a common metabolic waste of bacteria, is expelled by MDR system of gram‐negative bacteria for their survival. Experimental results suggest that AcrB, one of the key components of MDR system, undergoes large scale conformation changes during the pumping due to proton‐motive process. However, due to extremely short time scale, it is difficult to observe (experimentally) those changes in the AcrB, which might facilitate the pumping process. Molecular simulations can shed light to understand the conformational changes for transport of indole in AcrB. Examination of conformational changes using all‐atom simulation is, however, impractical. Here, we develop a hybrid coarse‐grained force field to study the conformational changes of AcrB in presence of indole in the porter domain of monomer II. Using the coarse‐grained force field, we investigated the conformational changes of AcrB for a number of model systems considering the effect of protonation in aspartic acid (Asp) residues Asp407 and Asp408 in the transmembrane domain of monomer II. Our results show that in the presence of indole, protonation of Asp408 or Asp407 residue causes conformational changes from binding state to extrusion state in monomer II, while remaining two monomers (I and III) approach access state in AcrB protein. We also observed that all three AcrB monomers prefer to go back to access state in the absence of indole. Steered molecular dynamics simulations were performed to demonstrate the feasibility of indole transport mechanism for protonated systems. Identification of indole transport pathway through AcrB can be very helpful in understanding the drug efflux mechanism used by the MDR bacteria." @default.
• W3003875558 created "2020-02-07" @default.
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• W3003875558 date "2020-02-08" @default.
• W3003875558 modified "2023-09-27" @default.
• W3003875558 title "Substrate‐dependent transport mechanism in AcrB of multidrug resistant bacteria" @default.
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• W3003875558 doi "https://doi.org/10.1002/prot.25877" @default.
• W3003875558 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7292753" @default.
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• W3003875558 hasPublicationYear "2020" @default.
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