Volume 11, Issue 12, Pages (June 2001)

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Volume 11, Issue 12, Pages 941-950 (June 2001) Novel small RNA-encoding genes in the intergenic regions of Escherichia coli  Liron Argaman, Ruth Hershberg, Jörg Vogel, Gill Bejerano, E.Gerhart H Wagner, Hanah Margalit, Shoshy Altuvia  Current Biology  Volume 11, Issue 12, Pages 941-950 (June 2001) DOI: 10.1016/S0960-9822(01)00270-6

Figure 1 Detection of novel sRNAs by Northern analysis. Total RNA was isolated from E. coli K12 cells grown in either rich (LB; 1.5, 2, 4, 6, 8, and 10 hrs after dilution) or minimal media supplemented with glycerol (M9; 3 and 8 hr after dilution) and from cells subjected to heat shock (HS; 42°C for 15 min) or cold shock (CS; 15°C for 30 min) treatment. In vitro transcription of sRNA-encoding genes is presented on the right side of each panel. PCR-generated DNA fragments carrying the sRNA genes were transcribed in vitro by E. coli RNA polymerase, and the products were analyzed by Northern analysis. The full-length product of SraH, visible in the in vitro assay, is indicated by the asterisk. 5′ end-labeled, MspI-digested pUC19 DNA was used as a molecular-weight size marker (M) Current Biology 2001 11, 941-950DOI: (10.1016/S0960-9822(01)00270-6)

Figure 1 Detection of novel sRNAs by Northern analysis. Total RNA was isolated from E. coli K12 cells grown in either rich (LB; 1.5, 2, 4, 6, 8, and 10 hrs after dilution) or minimal media supplemented with glycerol (M9; 3 and 8 hr after dilution) and from cells subjected to heat shock (HS; 42°C for 15 min) or cold shock (CS; 15°C for 30 min) treatment. In vitro transcription of sRNA-encoding genes is presented on the right side of each panel. PCR-generated DNA fragments carrying the sRNA genes were transcribed in vitro by E. coli RNA polymerase, and the products were analyzed by Northern analysis. The full-length product of SraH, visible in the in vitro assay, is indicated by the asterisk. 5′ end-labeled, MspI-digested pUC19 DNA was used as a molecular-weight size marker (M) Current Biology 2001 11, 941-950DOI: (10.1016/S0960-9822(01)00270-6)

Figure 2 5′- and 3′-end mapping of SraL RNA. Red color indicates the DNA sequence of SraL RNA, whereas blue color indicates that of soxR mRNA. The position of the two sets of gene-internal primers (104, 104A–C) used in 5′- and 3′-RACE reactions are indicated by arrows. The lines between the top and bottom strands indicate the inverted repeat sequences of the bidirectional terminator. Several promoters were predicted; the −35 and −10 hexamers of the σ70 consensus of two such promoters, the far-left and the far-right putative promoters, are shown (boxed). 5′ ends, 5a and 5b, that were identified only in TAP-treated samples indicate the transcription initiation site. 3a and 3b define the transcription termination site. The additional 3′ ends (3c–g) that were identified in minor 3′-RACE products most likely represent degradation intermediates. Nonencoded poly(A) tails of different lengths were identified on transcripts terminated at 3a and 3b. The numbering indicates the position in the E. coli genome database. ORF yjcD is located downstream of the area shown and starts at 4276048 Current Biology 2001 11, 941-950DOI: (10.1016/S0960-9822(01)00270-6)