Fig. 1

OacB topology model predicted by TOPCON. A Topology prediction of OacB. The red lines indicate ‘inside’, blue lines indicate ‘outside’; grey boxes indicate ‘Transmembrane(TM)-helix inside-out’ and empty boxes indicate ‘TM-helix outside-in’. B The consensus topology model of OacB is generated by the prediction programs. OacB is predicted to have 11 transmembrane (TM) domains, 12 loops with periplasmic N- and cytoplasmic C- termini. Roman numerals represent the TM domains, whereas Arabic numerals represent the loops in periplasm and cytoplasm