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Engineered disulfide bonds support the functional rotation mechanism of multidrug efflux pump AcrB

Engineered disulfide bonds support the functional rotation mechanism of multidrug efflux pump AcrB

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SEEGER, Markus A., Christoph von BALLMOOS, Thomas EICHER, Lorenz BRANDSTÄTTER, François VERREY, Kay DIEDERICHS, Klaas M. POS, 2008. Engineered disulfide bonds support the functional rotation mechanism of multidrug efflux pump AcrB. In: Nature Structural & Molecular Biology. 15(2), pp. 199-205. ISSN 1545-9993. eISSN 1545-9985. Available under: doi: 10.1038/nsmb.1379

@article{Seeger2008-02Engin-1209, title={Engineered disulfide bonds support the functional rotation mechanism of multidrug efflux pump AcrB}, year={2008}, doi={10.1038/nsmb.1379}, number={2}, volume={15}, issn={1545-9993}, journal={Nature Structural & Molecular Biology}, pages={199--205}, author={Seeger, Markus A. and Ballmoos, Christoph von and Eicher, Thomas and Brandstätter, Lorenz and Verrey, François and Diederichs, Kay and Pos, Klaas M.} }

Pos, Klaas M. Pos, Klaas M. 2008-02 Eicher, Thomas Engineered disulfide bonds support the functional rotation mechanism of multidrug efflux pump AcrB 2011-03-23T09:06:50Z The AcrA AcrB TolC complex is the major multidrug efflux pump in Escherichia coli. The asymmetric structure of the trimeric inner-membrane component AcrB implies functional rotation of the monomers and a peristaltic mode of drug efflux. This mechanism suggests the occurrence of conformational changes in the periplasmic pore domain through the movements of subdomains during cycling of the monomers through the different states loose (L), tight (T) and open (O). We introduced cysteines at the interfaces of potentially moving subdomains, leading to disulfide bond formation as quantified by alkylation of free cysteines and MALDI-TOF analysis. Inhibition of pump function as a result of cross-linking caused increased susceptibility to noxious compounds and reduction of N-phenylnaphthylamine efflux. Regain of function for impaired mutants was obtained upon exposure to the reducing agent DTT. The results support the presence of the asymmetric AcrB trimer in E. coli membranes and the functional rotation mechanism. Diederichs, Kay Seeger, Markus A. Verrey, François Verrey, François Publ. in: Nature structural & molecular biology 15 (2008), 2, pp. 199-205 Eicher, Thomas Brandstätter, Lorenz Seeger, Markus A. eng Diederichs, Kay deposit-license 2011-03-23T09:06:50Z Ballmoos, Christoph von Ballmoos, Christoph von Brandstätter, Lorenz

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