Fig. 1.

Genetic organization of the metY-nusA-infB operon region of the chromosome. The gene metY encodes a minor form of the initiator tRNA, rimP encodes the ribosome maturation protein RimP, nusA encodes the transcriptional elongation factor NusA, infB encodes the translation initiation factor IF2; rbfA encodes the ribosome binding factor RbfA, truB encodes the tRNA Ψ55 synthase, rpsO encodes ribosomal protein S15, and pnp encodes polynucleotide phosphorylase. P₋₁, P₁, P₂, and P indicate the locations of promoters, and T₁, T₂, T₃, and T indicate intrinsic transcriptional terminators, while RE and RIII show the cleavage sites for RNase E and RNase III, respectively. Horizontal arrows represent transcriptional products.