AcrB
= AcrB
{c}
<AcrB> is a bacterial proton-coupled multidrug transporter that functions as part of the AcrAB–TolC export assembly. Its asymmetric trimer and multiple drug-binding regions are structural models for studying broad specificity.<Crystal structures of a multidrug transporter reveal a functionally rotating mechanism by Satoshi Murakami and others>[Figs. 1–5, drug-bound asymmetric AcrB trimer]{ref}