Skip to main content
. 2011 Sep;77(18):6451–6462. doi: 10.1128/AEM.00661-11

Fig. 2.

Fig. 2.

Sequence analysis of the putative polycistronic operon orf18-21. (a) Putative regulatory elements of the orf18-21 operon. The ribosome binding site (RBS), −10 and −35 promoter sequences, and rho-independent terminator signal are shown in bold and underlined. (b) Locations of the conserved domains typical of ABC transporter ATPases in Orf20: the Walker A (consensus GxxGxGKS/T, where x is any residue) and Walker B (consensus hhhhDE, where h is a hydrophobic residue) motifs involved in ATP binding and the Walker C (consensus LSGGQQ/R/KQR) motif involved in ATP hydrolysis are shown underlined. (c) TOPCONS consensus prediction of membrane topology for Orf21, showing seven transmembrane motifs (i, inside; M, transmembrane; o, outside) typical of ABC transporter permeases.