FIG. 1.
Location of parAB loci and parS sites. At left, arrows indicate the position of each parA homologue start codon relative to the GC skew of the 10th (0.95 to 0.05) of the replicon centered on the GC-skew minimum (c1 to c3) or of the whole replicon (p1). Genetic map sketches are aligned at parA homologue start codons and show only genes characteristic of chromosome origin regions or relevant to plasmid maintenance. orf5 is a gene of unknown function, named for its position in the gid-par operon. repA (c2 and c3) signifies generic resemblance to plasmid replication control genes; trfA indicates homology with the corresponding RK2 gene. S, parS sites (c1) or parS-like palindromes (c2, c3, and p1); S*, degenerate parS-like sequences; P, predicted promoter internal to parA of c3; A, predicted DnaA box motifs based on the consensus 5′-TTATCCAC.