FIG. 6.

Molecular organization of the chromosomal region encompassing ompG and the psp operon. Ten uncharacterized genes (b1309 to 1317 and orf1) are present between ompG and the psp operon. These 10 ORFs as well as a significant portion of the psp operon are deleted (marked by dotted lines) in the cog-192 strain. The deletion aligns ompG with the pspA promoter; precise ends of the deletion are shown in a close-up diagram below. Double-headed arrows show DNA probes used in Southern and/or Northern blot analysis. Locations of various primers and of restriction enzyme sites are shown at the top. Abbreviations: B, BglII; C, ClaI; N, NcoI; and S, SalI.