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. 1999 Jun;181(12):3803–3809. doi: 10.1128/jb.181.12.3803-3809.1999

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Copyright © 1999, American Society for Microbiology

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FIG. 1 — The common structure of the rRNA operons in E. coli. Open and filled rectangles represent rRNA (16S, 23S, and 5S) and tRNA genes, respectively. rrnB, rrnC, rrnE, and rrnG contain the spacer tRNA gene for Glu-2, and the other operons (rrnA, rrnD, and rrnH) contain the spacer tRNA genes for Ile-1 and Ala-1B (25). Distal tRNA genes are encoded by only three operons: rrnC contains the tRNA genes for Asp-1 and Trp, and rrnD and rrnH contain the tRNA genes for Thr-1 and Asp-1, respectively. The figure also indicates the relative positions of promoters (P1 P2), terminators (ter), and relevant restriction sites.