Table 2.

(ARN)_X motifs found in E. coli sRNAs.

Number of identified regions with an (ARN)X motifa	sRNAb
0	6S, ArcZ, CyaR, DicF, DsrA, FnrS, GadY, GlmY, ISO92, IstR-1, IstR-2, MicA, MicF, OmrA, OmrB, RdlA, RdlB, RdlC, RdlD, RprA, RseX, RybB, RydB, RydC, RyeB, RyhB, RyjB, SgrS, SibC, SibD, SokB, SokC, SokE, SokX, Spot42, SraF, SraG, SroA, SroE, SymR, tff, tp2
1	4.5S (56–69), GcvB (9–24), GlmZ (187–198), MgrR (37–53), MicC (66–93), MicM (26–44), OhsC (21–44), OxyS (59–86), RyjA (84–117), SibA (53–69), SibB (32–51), SibE (43–71), SraB (89–122), SroC (4–19), SroD (31–54), SroG (74–91), SroH (97–126)
2	CsrB (226–240, 294–321), RNaseP (129–144, 245–260), RyeG (71–84, 137–155), RyfA (200–219, 259–278), RydF (50–65, 84–99)
3	—
4	CsrC (17–72, 97–125, 143–156, 202–215),RyeA (1–17, 32–53, 188–204, 217–234), tmRNA (69–95, 174–196, 225–247, 309–328)
5 or more	—

^aOne (ARN)_X motif contains at least 4 ARN triplets within a sequence window of 20 nucleotides.

^bThe coordinates of (ARN)_X motifs are shown in brackets. Note that overlapping regions of ARN pattern matches were merged together into one single (ARN)_X motif.