FIG. 2.

(A) Base sequences of the R1162 oriT (8) and of the presumptive pSC101 oriT. The region with a nearly identical base sequence is boxed by the dotted broken line, and the location of the cleavage site in the R1162 oriT is shown by the inverted triangle. Bases potentially involved in intrastrand base pairing to form a hairpin loop are underlined. (B) Amino acid sequence of MobA proteins of R1162 and pSC101, aligned to show similarities. Identical amino acids are boxed; similar amino acids are underlined. Only the amino-terminal region of R1162 MobA, encoded by that portion of the gene extending up to the overlap with mobB (Fig. 1), is shown. (C) Alignment of MobB and MobX. Amino acid sequences in panels B and C were determined from plasmid DNA base sequences (3, 27).