Fig 1.
The alp7AR and parMR operons have similar structures. The alp7AR and parMR operons are diagrammed to scale, with the lengths of their gene products in amino acids (aa) shown. The alp7C sequence through the second codon of alp7A is presented below, with the alp7A initiation codon underlined. Two potential σA promoters are denoted in lowercase (17). The sequence contained in a set of near-repeat elements is indicated as green text; the individual repeats are boxed. As construed here, six of the repeats overlap an adjoining repeat by one base. An inferred consensus is presented in the upper right. The presence of a base or a pair of bases in the consensus requires at least six or more appearances at that position; deviations are indicated in red. Some deviations, as in repeats 7 and 9, appear to reflect promoter element constraints.