FIG. 3.

Structure of ctnA. In the sequences of the 5′ and 3′ termini of ctnA, arrows mark the TSS and termination site. The underlined sequence is a putative polyadenylation site. The thick black arrow indicates the ctnA gene, of 2,006 bp, encoding a 576-amino-acid protein with four introns shown by empty rectangles (with intron sizes shown). The rectangle on the far left indicates the position of the Zn(II)2Cys6 DNA binding motif. The large, bold letters in the highlighted sequence are cysteinyl residues constituting the Zn(II)2Cys6 DNA binding motif at the N terminus.