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Structural comparison of periplasmic adaptor proteins. BesA structure compared to known drug efflux pump adaptors MexA (P. aeruginosa) and AcrA (E. coli), MacA (E. coli macrolide efflux pump) and the metal efflux pump adaptors CusB (E. coli) and ZneB (C. metallidurans). MP domains of BesA, MexA and AcrA have an N-terminal lipoyl attachment site anchoring the adaptor in the IM. Dotted orange lines indicate unobserved MP domain terminal regions.
