Coe1 in Beta vulgaris L. Has a Tnp2-Domain DNA Transposase Gene within Putative LTRs and Other Retroelement-Like Features

Figure 1

A schematic diagram of Coe1, a DNA transposon within an LTR retrotransposon. Inverted repeats are in checkerboard with arrows indicating direction. Dark green lines depict the 8-mer DNA sequence motif CACTATAA, whereas lighter green lines show the sequence motif CACTA. Heavily cross-hatched regions depict the putative LTRs. The lightly dotted blue and red regions show the composite element. Darker shaded red or blue boxes are exons of retroelement ORFs or of a central DNA transposase gene, respectively. A red-highlighted box with downward (backward) slanting lines depicts an apparent polymerase binding site (PBS). Lighter red or blue boxes, between exons, are introns. Repeating units of a light blue to dark blue gradient depicts repeating “MDTR” units within an intron of the DNA transposase gene (blue). A red box with horizontal lines depicts the apparent active site (save for a stop signal) of the predicted protein product encoded by retroelement integrase/reverse transcriptase. A box with upward (forward) slanting lines depicts a polypurine tract. Scale is in kilobases is shown with 2 Kb increments. Names of putative genes are shown above the respective ORFs in Coe1.