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From Proteopedia
Crystal structure of AcrB deletion mutant in complex with antibiotic in P21 space group
Structural highlights
FunctionACRB_ECOLI AcrAB is a drug efflux protein with a broad substrate specificity.[1] [2] [3] Publication Abstract from PubMedGram-negative bacteria such as E. coli use tripartite efflux pumps such as AcrAB-TolC to expel antibiotics and noxious compounds. A key feature of the inner membrane transporter component, AcrB, is a short stretch of residues known as the gate/switch loop that divides the proximal and distal substrate binding pockets. Amino acid substitutions of the gate loop are known to decrease antibiotic resistance conferred by AcrB. Here we present two new AcrB gate loop variants, the first stripped of its bulky side chains, and a second in which the gate loop is removed entirely. By determining the crystal structures of the variant AcrB proteins in the presence and absence of erythromycin and assessing their ability to confer erythromycin tolerance, we demonstrate that the gate loop is important for AcrB export activity but is not required for erythromycin binding. Structures of Gate Loop Variants of the AcrB Drug Efflux Pump Bound by Erythromycin Substrate.,Ababou A, Koronakis V PLoS One. 2016 Jul 12;11(7):e0159154. doi: 10.1371/journal.pone.0159154., eCollection 2016. PMID:27403665[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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