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- W2768731403 abstract "Transporters undergo large conformational changes in their functional cycle. RND (Resistance-Nodulation-Division) family efflux transporters usually exist as homotrimers, and each protomer was proposed to undergo a cycle of conformational changes in succession so that at any given time the trimer would contain three protomers of different conformations, the functionally rotating mechanism of transport. This mechanism implies that the inactivation of one protomer among three will inactivate the entire trimeric ensemble by blocking the functional rotation. We describe a biochemical approach to test this prediction by first producing a giant protein in which the three protomers of Escherichia coli AcrB efflux pump are covalently linked together through linker sequences, and then testing for its function by inactivation of a single protomer unit. Inactivation can be done permanently by mutating a residue involved in proton relay, or in real time by using a protein in which one protomer contains two Cys residues on both sides of the large cleft in the periplasmic domain and then by rapidly inactivating this protomer with a methanethiosulfonate cross-linker." @default.
- W2768731403 created "2017-12-04" @default.
- W2768731403 creator A5086380170 @default.
- W2768731403 date "2017-11-25" @default.
- W2768731403 modified "2023-09-27" @default.
- W2768731403 title "Covalently Linked Trimers of RND (Resistance-Nodulation-Division) Efflux Transporters to Study Their Mechanism of Action: Escherichia coli AcrB Multidrug Exporter as an Example" @default.
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- W2768731403 doi "https://doi.org/10.1007/978-1-4939-7454-2_9" @default.
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