- PDB-6sgu: Cryo-EM structure of Escherichia coli AcrB and DARPin in Saposin ... -
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基本情報
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データベース: PDB / ID: 6sgu
タイトル
Cryo-EM structure of Escherichia coli AcrB and DARPin in Saposin A-nanodisc
要素
DARPin
Multidrug efflux pump subunit AcrB
キーワード
MEMBRANE PROTEIN / RND transporter / efflux pump / drug transport / antibiotic resistance / lipid nanodisc
機能・相同性
機能・相同性情報
alkane transmembrane transporter activity / alkane transport / enterobactin transport / enterobactin transmembrane transporter activity / xenobiotic detoxification by transmembrane export across the cell outer membrane / periplasmic side of plasma membrane / efflux pump complex / bile acid transmembrane transporter activity / xenobiotic transport / bile acid and bile salt transport ...alkane transmembrane transporter activity / alkane transport / enterobactin transport / enterobactin transmembrane transporter activity / xenobiotic detoxification by transmembrane export across the cell outer membrane / periplasmic side of plasma membrane / efflux pump complex / bile acid transmembrane transporter activity / xenobiotic transport / bile acid and bile salt transport / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / fatty acid transport / response to toxic substance / response to xenobiotic stimulus / response to antibiotic / identical protein binding / membrane / plasma membrane 類似検索 - 分子機能
ジャーナル: Structure / 年: 2020 タイトル: Interactions of a Bacterial RND Transporter with a Transmembrane Small Protein in a Lipid Environment. 著者: Dijun Du / Arthur Neuberger / Mona Wu Orr / Catherine E Newman / Pin-Chia Hsu / Firdaus Samsudin / Andrzej Szewczak-Harris / Leana M Ramos / Mekdes Debela / Syma Khalid / Gisela Storz / Ben F Luisi / 要旨: The small protein AcrZ in Escherichia coli interacts with the transmembrane portion of the multidrug efflux pump AcrB and increases resistance of the bacterium to a subset of the antibiotic ...The small protein AcrZ in Escherichia coli interacts with the transmembrane portion of the multidrug efflux pump AcrB and increases resistance of the bacterium to a subset of the antibiotic substrates of that transporter. It is not clear how the physical association of the two proteins selectively changes activity of the pump for defined substrates. Here, we report cryo-EM structures of AcrB and the AcrBZ complex in lipid environments, and comparisons suggest that conformational changes occur in the drug-binding pocket as a result of AcrZ binding. Simulations indicate that cardiolipin preferentially interacts with the AcrBZ complex, due to increased contact surface, and we observe that chloramphenicol sensitivity of bacteria lacking AcrZ is exacerbated when combined with cardiolipin deficiency. Taken together, the data suggest that AcrZ and lipid cooperate to allosterically modulate AcrB activity. This mode of regulation by a small protein and lipid may occur for other membrane proteins.