2.A.117.1.1
The Chlorhexidine drug-resistance exporter, AceI of 179 aas and 4 TMSs (Hassan et al. 2013) .  It is capable of exporting multiple drugs such as benzalkonium, dequalinium, proflavine, and acriflavine. (Hassan et al. 2015). The aceI gene is induced in A. baumannii by the short-chain diamines, cadaverine and putrescine. Membrane transport experiments conducted in whole cells of A. baumannii and Escherichia coli and also in proteoliposomes showed that AceI mediates the efflux of these short-chain diamines (polyamines) such as  when energized by an electrochemical gradient (Hassan et al. 2019), suggesting that they are the phsiological substrates of AceI. AceI can form dimers and is regulated at the transcriptional level by AceR (Bolla et al. 2020).