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• W2331888516 abstract "The majority of membrane proteins function as oligomers. However, it remains largely unclear how the oligomer stability of protein complexes correlates with their function. Understanding the relationship between oligomer stability and activity is essential to protein research and to virtually all cellular processes that depend on the function of protein complexes. Proteins make lasting or transient interactions as they perform their functions. Obligate oligomeric proteins exist and function exclusively at a specific oligomeric state. Although oligomerization is clearly critical for such proteins to function, a direct correlation between oligomer affinity and biological activity has not yet been reported. Here, we used an obligate trimeric membrane transporter protein, AcrB, as a model to investigate the correlation between its relative trimer affinity and efflux activity. AcrB is a component of the major multidrug efflux system in Escherichia coli. We created six AcrB constructs with mutations at the transmembrane intersubunit interface, and we determined their activities using both a drug susceptibility assay and an ethidium bromide accumulation assay. The relative trimer affinities of these mutants in detergent micelles were obtained using blue native polyacrylamide gel electrophoresis. A correlation between the relative trimer affinity and substrate efflux activity was observed, in which a threshold trimer stability was required to maintain efflux activity. The trimer affinity of the wild-type protein was approximately 3 kcal/mol more stable than the threshold value. Once the threshold was reached, an additional increase of stability in the range observed had no observable effect on protein activity." @default.
• W2331888516 created "2016-06-24" @default.
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• W2331888516 date "2014-06-03" @default.
• W2331888516 modified "2023-10-01" @default.
• W2331888516 title "Correlation between AcrB Trimer Association Affinity and Efflux Activity" @default.
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• W2331888516 doi "https://doi.org/10.1021/bi5000838" @default.
• W2331888516 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4067148" @default.
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• W2331888516 hasPublicationYear "2014" @default.
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