5NIL:
reference: Structure of the MacAB-TolC ABC-type tripartite multidrug efflux pump., Fitzpatrick AWP, Llabres S, Neuberger A, Blaza JN, Bai XC, Okada U, Murakami S, van Veen HW, Zachariae U, Scheres SHW, Luisi BF, Du D, Nat Microbiol. 2017 May 15;2:17070. doi: 10.1038/nmicrobiol.2017.70. PMID: 28504659

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).