RegulonDB RegulonDB 10.9:Regulon Page

MarR DNA-binding transcriptional repressor

Synonyms: MarR, MarR-salicylate, MarR-2,4-dinitrophenol, MarR-Benzoate, MarR-Menadione, MarR-Paraquat, MarR-Phenazine methosulfate, MarR-Plumbagin, MarR-Sodium salicylate
MarR, "Multiple antibiotic resistance" [4], participates in controlling several genes involved in resistance to antibiotics [], multidrug efflux [7], oxidative stress [], organic solvents [], and heavy metals []. The antibiotic resistance associated with MarR appears to involve the acidification of the cytoplasm []. MarR is part of the marRAB operon and negatively autoregulates its own expression [].
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Transcription factor      
TF conformation(s):
Name Conformation Type TF-Effector Interaction Type Apo/Holo Conformation Evidence (Confirmed, Strong, Weak) References
MarR Functional   Apo [APPH], [BPP], [GEA] [1], [2], [3]
MarR-2,4-dinitrophenol Non-Functional Allosteric Holo [BPP], [GEA] [3]
MarR-Benzoate Non-Functional Allosteric Holo [BPP], [GEA] [3]
MarR-Menadione Non-Functional Allosteric Holo [BPP], [GEA] [3]
MarR-Paraquat Non-Functional Allosteric Holo [BPP], [GEA] [3]
MarR-Phenazine methosulfate Non-Functional Allosteric Holo [BPP], [GEA] [3]
MarR-Plumbagin Non-Functional Allosteric Holo [BPP], [GEA] [3]
MarR-Sodium salicylate Non-Functional Allosteric Holo nd nd
MarR-salicylate Non-Functional Allosteric Holo [BPP], [GEA] [3]
Evolutionary Family: MarR
Connectivity class: Local Regulator
Gene name: marR
  Genome position: 1619120-1619554
  Length: 435 bp / 144 aa
Operon name: marRAB
TU(s) encoding the TF:
Transcription unit        Promoter

Regulated gene(s) marA, marB, marR
Multifun term(s) of regulated gene(s) MultiFun Term (List of genes associated to the multifun term)
drug resistance/sensitivity (3)
Transcription related (2)
repressor (2)
operon (2)
detoxification (2)
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Regulated operon(s) marRAB
First gene in the operon(s) marR
Simple and complex regulons AcrR,CRP,CpxR,Cra,Fis,MarA,MarR,Rob,SoxS
Simple and complex regulatory phrases Regulatory phrase (List of promoters regulated by the phrase)

Transcription factor regulation    

Transcription factor binding sites (TFBSs) arrangements

  Functional conformation Function Promoter Sigma factor Central Rel-Pos Distance to first Gene Genes Sequence LeftPos RightPos Evidence (Confirmed, Strong, Weak) References
  MarR repressor marRp Sigma70 -18.0 -45.0 marR, marA, marB
1619064 1619085 [AIBSCS], [APIORCISFBSCS], [BPP], [GEA], [GS], [SM] [1], [2], [3], [4], [5], [6]
  MarR repressor marRp Sigma70 17.0 -11.0 marR, marA, marB
1619098 1619119 [AIBSCS], [APIORCISFBSCS], [BPP], [GEA], [GS], [SM] [1], [2], [3], [4], [5], [6]

Evolutionary conservation of regulatory elements    
     Note: Evolutionary conservation of regulatory interactions and promoters is limited to gammaproteobacteria.
Promoter-target gene evolutionary conservation


 [1] Martin RG., Rosner JL., 1995, Binding of purified multiple antibiotic-resistance repressor protein (MarR) to mar operator sequences., Proc Natl Acad Sci U S A 92(12):5456-60

 [2] Notka F., Linde HJ., Dankesreiter A., Niller HH., Lehn N., 2002, A C-terminal 18 amino acid deletion in MarR in a clinical isolate of Escherichia coli reduces MarR binding properties and increases the MIC of ciprofloxacin., J Antimicrob Chemother 49(1):41-7

 [3] Seoane AS., Levy SB., 1995, Characterization of MarR, the repressor of the multiple antibiotic resistance (mar) operon in Escherichia coli., J Bacteriol 177(12):3414-9

 [4] Cohen SP., Hachler H., Levy SB., 1993, Genetic and functional analysis of the multiple antibiotic resistance (mar) locus in Escherichia coli., J Bacteriol 175(5):1484-92

 [5] Martin RG., Rosner JL., 2004, Transcriptional and translational regulation of the marRAB multiple antibiotic resistance operon in Escherichia coli., Mol Microbiol 53(1):183-91

 [6] Shimada T., Ogasawara H., Ishihama A., 2018, Single-target regulators form a minor group of transcription factors in Escherichia coli K-12., Nucleic Acids Res 46(8):3921-3936

 [7] Ruiz C., Levy SB., 2010, Many chromosomal genes modulate MarA-mediated multidrug resistance in Escherichia coli., Antimicrob Agents Chemother 54(5):2125-34

 [8] Pomposiello PJ., Bennik MH., Demple B., 2001, Genome-wide transcriptional profiling of the Escherichia coli responses to superoxide stress and sodium salicylate., J Bacteriol 183(13):3890-902

 [9] Sulavik MC., Gambino LF., Miller PF., 1995, The MarR repressor of the multiple antibiotic resistance (mar) operon in Escherichia coli: prototypic member of a family of bacterial regulatory proteins involved in sensing phenolic compounds., Mol Med 1(4):436-46

 [10] Martin RG., Jair KW., Wolf RE., Rosner JL., 1996, Autoactivation of the marRAB multiple antibiotic resistance operon by the MarA transcriptional activator in Escherichia coli., J Bacteriol 178(8):2216-23

 [11] Linde HJ., Notka F., Metz M., Kochanowski B., Heisig P., Lehn N., 2000, In vivo increase in resistance to ciprofloxacin in Escherichia coli associated with deletion of the C-terminal part of MarR., Antimicrob Agents Chemother 44(7):1865-8

 [12] Perez-Rueda E., Collado-Vides J., Segovia L., 2004, Phylogenetic distribution of DNA-binding transcription factors in bacteria and archaea., Comput Biol Chem 28(5-6):341-50

 [13] Doukyu N., Ishikawa K., Watanabe R., Ogino H., 2012, Improvement in organic solvent tolerance by double disruptions of proV and marR genes in Escherichia coli., J Appl Microbiol 112(3):464-74