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- W2969642357 abstract "Gram-negative bacteria are naturally resistant to many antibiotics because their surface is covered by the glycolipid LPS. Newly synthesized LPS is transported across the cell envelope by the multiprotein Lpt machinery, which includes LptB 2 FGC, an unusual ABC transporter that extracts LPS from the inner membrane. Like in other ABC transporters, the LptB 2 FGC transport cycle is driven by the cyclical conformational changes that a cytoplasmic, dimeric ATPase, LptB, undergoes when binding and hydrolyzing ATP. How these conformational changes are controlled in ABC transporters is poorly understood. Here, we identified two lethal changes in LptB that, when combined, remarkably restore wild-type transport function. Biochemical studies revealed that the two changes affect different steps in the transport cycle, having opposing, lethal effects on LptB’s dimerization cycle. Our work provides mechanistic details about the LptB 2 FGC extractor that could be used to develop Lpt inhibitors that would overcome the innate antibiotic resistance of Gram-negative bacteria." @default.
- W2969642357 created "2019-08-29" @default.
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- W2969642357 date "2019-08-27" @default.
- W2969642357 modified "2023-10-15" @default.
- W2969642357 title "Combining Mutations That Inhibit Two Distinct Steps of the ATP Hydrolysis Cycle Restores Wild-Type Function in the Lipopolysaccharide Transporter and Shows that ATP Binding Triggers Transport" @default.
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- W2969642357 doi "https://doi.org/10.1128/mbio.01931-19" @default.
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