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• W2023902283 startingPage "2594" @default.
• W2023902283 abstract "MsbA is a member of the ABC transporter superfamily and is homologous to ABC transporters linked to multidrug resistance. The nucleotide binding domains (NBDs) of these proteins include conserved motifs that are involved in ATP binding, including conserved SALD residues (D-loop) that are diagnostic in identifying ABC transporters but whose roles have not been identified. Within the D-loop, single point mutations L511P and D512G were discovered by random mutational analysis of MsbA to disrupt protein function in the cell [Polissi, A., and Georgopoulos, C. (1996) Mol. Microbiol. 20, 1221−1233] but have not been further studied in MsbA or in detail in any other ABC transporter. In these studies, we show that both L511P and D512G mutants of MsbA are able to bind ATP at near-wild-type levels but are unable to maintain cell viability in an in vivo growth assay, verifying the theory that they are dysfunctional at some point after ATP binding. An ATPase assay further suggests that the L511P mutation prevents effective ATP hydrolysis, and an ATP detection assay reveals that only small amounts of ATP are hydrolyzed; D512G is able to hydrolyze ATP at a rate 3-fold faster than that of the wild type. EPR spectroscopy studies using reporter sites within the NBDs also indicate that at least some hydrolysis occurs in L511P or D512G MsbA but show fewer spectral changes than observed for the same reporters in the wild-type background. These studies indicate that L511 is necessary for efficient ATP hydrolysis and D512 is essential for conformational rearrangements required for flipping lipid A." @default.
• W2023902283 created "2016-06-24" @default.
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• W2023902283 date "2011-03-08" @default.
• W2023902283 modified "2023-09-24" @default.
• W2023902283 title "Effects of the L511P and D512G Mutations on the <i>Escherichia coli</i> ABC Transporter MsbA" @default.
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• W2023902283 doi "https://doi.org/10.1021/bi1018418" @default.
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