RegulonDB

RegulonDB RegulonDB 11.1: smallRNA Form

small regulatory RNA OmrB small RNA in Escherichia coli K-12 genome

Gene local context to scale (view description)

small RNA
Gene name:	omrB
Synonym(s):	OmrB, PAIR2b, RygB, T59
Genome position:	2976304 <-- 2976385
Strand:	reverse
Sequence:	Get ribonucleotide sequence FastaFormat
GC content %:	47.56
Note(s):	OmrB is a small RNA that is involved in regulating the protein composition of the outer membrane Guillier M,2006. OmrB was shown to negatively regulate the levels of ompT, cirA, fecA Guillier M,2006, gntP 16717284, ompR Guillier M,2008. 27439713, csgD Holmqvist E,2010, flhDC De Lay N,2012, dgcM Hoekzema M,2019, and flgM Romilly C,2020 mRNAs. The effect of OmrB on ompT and cirA abundance is dependent on RNase E and involves direct base pairing at the 5' end of OmrB Guillier M,2008. OmrB affects DgcM translation by competing with the ribosome for binding to the dgcM mRNA that has been restructured by Hfq Hoekzema M,2019. A set of targets for regulation by OmrB has been predicted, but only a small percentage of those possible targets was supported by microarray data 16717284. Binding site features for OmrA were identified by high-throughput in vivo mapping Mihailovic MK,2018. OmrB represses its own synthesis via feedback regulation of its transcriptional activator OmpR 27439713. Interaction between OmrB RNA and Hfq protein has been detected Wassarman KM,2001, and the effect of OmrB on ompT and cirA expression is dependent on Hfq Guillier M,2008. OmrA and OmrB were first recognized as an intergenic duplication (PAIR2) containing sites that resemble Rho-independent terminators Rudd KE.,1999. The 5' and 3' ends of OmrA and OmrB are nearly identical, but their central regions differ. OmrB levels increase at the end of exponential phase and decrease after the onset of stationary phase Vogel J,2003. The half life of OmrB in both exponential and stationary phase is 30 minutes Vogel J,2003. Transcription of omrB is regulated by OmpR Guillier M,2006. The 5' end of OmrB is required for the regulatory function of the small RNA Guillier M,2008. An omrAB deletion mutant shows a change in the protein composition of the outer membrane Guillier M,2006. Overexpression of omrB inhibits the formation of curli by downregulating CsgD expression Holmqvist E,2010. Bak G,2015. Transcription of omrB is activated by OmpR Guillier M,2006. 27439713. Ryx: RNA of unknown function at X position (10 minute) in the genome Wassarman KM,2001 OmrB: OmpR-regulated sRNA B Guillier M,2006 Reviews: Vogel J, Papenfort K,2006. Papenfort K, Vogel J,2009. 25028968. 32213244
Evidence:	[EXP-IMP] Inferred from mutant phenotype
Reference(s):	[1] Guillier M., et al., 2006 [2] Guillier M., et al., 2008
External database links:

ECOCYC:	RYGB-RNA
ECOLIWIKI:	b4445
M3D:	small regulatory RNA OmrB

Regulation exerted by the small RNA

	Target	Mechanism	Function	Target Type	Binding Site			Evidence	Confidence level (C: Confirmed, S: Strong, W: Weak)	Reference(s)
	Target	Mechanism	Function	Target Type	LeftPos	RightPos	Sequence	Evidence		Reference(s)
	cirA	MRNA-DEGRADATION	repressor	TU	2246779	2246804	CCAUGAGGUAACUACGAAAAUAAAAU	[EXP-IMP-SITE-MUTATION]	S	[2]
	cirA	MRNA-DEGRADATION	repressor	TU	2246779	2246804	CCAUGAGGUAACUACGAAAAUAAAAU	[EXP-IMP-SITE-MUTATION]	S	[2]
	ompT	MRNA-DEGRADATION	repressor	TU	585614	585645	CCCAGAAGUUUCGCCCGCAUAAAAGUUCUCCA	[EXP-IMP-SITE-MUTATION]	S	[2]
	csgDEFG	TRANSLATION-BLOCKING	repressor	TU	1103257	1103275	CCAGAAGUACUGACAGAUG	[EXP-IDA] [EXP-IMP-SITE-MUTATION]	S	[3]
	csgDEFG	TRANSLATION-BLOCKING	repressor	TU	1103257	1103275	CCAGAAGUACUGACAGAUG	[EXP-IDA] [EXP-IMP-SITE-MUTATION]	S	[3]
	fepA	TRANSLATION-BLOCKING	repressor	Gene	612451	612472	CCCAGAUUGACCAACAAGGCCA	[EXP-IEP] [EXP-IMP-SITE-MUTATION]	S	[2] [4]
	flgM	TRANSLATION-BLOCKING	repressor	Gene	1130102	1130126	CAGAGGCGAAGUGCGAUCAAUACUC	[EXP-IDA] [EXP-IMP-SITE-MUTATION] [EXP-IPI]	S	[5]
	ydaM	TRANSLATION-BLOCKING	repressor	TU	1407768	1407779	CCAGGGUAUUGA	[EXP-IMP-SITE-MUTATION]	S	[6]
	flhDC	nd	repressor	TU	1978206	1978251	CCCAGAAUAACCAACUUUAUUUUUAUGCGGUUUCACCGCACCCCGU	[EXP-IMP] [EXP-IMP-SITE-MUTATION]	S	[7]
	ompR	nd	repressor	Gene	3536595	3536613	CCCAAAGGUUCGCAACAAU	[EXP-IEP] [EXP-IMP-SITE-MUTATION]	S	[2]

Evidence:

[EXP-IMP-SITE-MUTATION] Site mutation
[EXP-IDA] Inferred from direct assay
[EXP-IEP] Inferred from expression pattern
[EXP-IPI] Inferred from physical interaction
[EXP-IMP] Inferred from mutant phenotype

Reference(s)
[1] Guillier M., Gottesman S., 2006, Remodelling of the Escherichia coli outer membrane by two small regulatory RNAs., Mol Microbiol 59(1):231-47
[2] Guillier M., Gottesman S., 2008, The 5' end of two redundant sRNAs is involved in the regulation of multiple targets, including their own regulator., Nucleic Acids Res 36(21):6781-94
[3] Holmqvist E., Reimegard J., Sterk M., Grantcharova N., Romling U., Wagner EG., 2010, Two antisense RNAs target the transcriptional regulator CsgD to inhibit curli synthesis., EMBO J 29(11):1840-50
[4] Jagodnik J., Chiaruttini C., Guillier M., 2017, Stem-Loop Structures within mRNA Coding Sequences Activate Translation Initiation and Mediate Control by Small Regulatory RNAs., Mol Cell 68(1):158-170.e3
[5] Romilly C., Hoekzema M., Holmqvist E., Wagner EGH., 2020, Small RNAs OmrA and OmrB promote class III flagellar gene expression by inhibiting the synthesis of anti-Sigma factor FlgM., RNA Biol 17(6):872-880
[6] Hoekzema M., Romilly C., Holmqvist E., Wagner EGH., 2019, Hfq-dependent mRNA unfolding promotes sRNA-based inhibition of translation., EMBO J 38(7)
[7] De Lay N., Gottesman S., 2012, A complex network of small non-coding RNAs regulate motility in Escherichia coli., Mol Microbiol 86(3):524-38

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