The taxonomic position of the Lecithocera luridella Christoph, 1882 and rank of the group Carcina Hübner, are established on the base of the integrative approach, combining comparative morphological and molecular phylogenetic methods. Here we refer to plasmids ColE2 to E9 as the ColE2-related plasmids. More recently, biochemical and nucleotide sequencing analyses of these plasmids have revealed that colicins E2 to E9 are closely related (Toba et al., 1988 Chak et al., 1991 for details see papers by James et al., Lau, and Masaki et al. Analyses of these plasmids, using various restriction enzymes, have previously shown that the plasmids ColE2 to E9 are structurally similar (Lawrence & James, 1984 Watson et al., 1985a Watson et al., 1985b Chak & James, 1986), whereas plasmid ColEl is distinct (see Chan et al., 1985). are small (about 7 kb, except for plasmids ColE2imm-K317 and ColE6-CT14 which are about 5 kb and 11 kb, respectively), multicopy and nonconjugative (Watsonet al., 1981 Mock & Pugsley, 1982 Cooper & James, 1984).
The seventeen plasmids which carry the genes for the E colicins and their immunity proteins. Nine different colicins are distinguished based upon the specificity of interaction of the colicins with their immunity proteins (Males & Stocker, 1982 Cooper & James, 1984). coli cell surface receptor, the btuB gene product. The E colicins are a group of bacterial plasmid-coded toxins which use the E.
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