Fig. 2.

Alignments of three two-TMS hairpin repeats in ABC1-type transmembrane porters. All of the porters included in this study are homologous throughout their lengths. a Comparison of TMSs 1 and 2 (ZP_02078939) with TMSs 3 and 4 (YP_267051) in ABC1 proteins. This alignment gave a comparison score of 10.0 sd. b Comparison of TMSs 1 and 2 (NP_419501) with TMSs 5 and 6 (YP_523966) in ABC1 proteins. This alignment gave a comparison score of 10.1 sd. c Comparison of TMSs 3 and 4 (YP_855895) with TMSs 5 and 6 (ZP_01811308) in ABC1 proteins. This alignment gave a comparison score of 10.1 sd. In these figures, as well as in Fig. 3, shaded areas represent predicted α-helical TMSs based on the WHAT program (Zhai and Saier 2001a). A vertical line indicates an identity, a colon denotes a close similarity and a dot indicates a more distant similarity, all as defined by the GAP program (Devereux et al. 1984)