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CusR DNA-binding transcriptional activator

Synonyms: CusR-Pasp, CusR
CusR, Cu-sensing regulator , regulates genes related to the copper and silver efflux systems [3, 5]under anaerobic growth and under extreme copper stress in aerobic growth [6] CusR belongs to the two-component system CusS/CusR, which responds to increases in the copper concentration. Both cusR, encoding the response regulator, and cusS, encoding the sensor kinase, are organized in an operon that is located next to and in the opposite direction to an operon whose expression is activated by CusR [3] The sensor proteins YedW, UhpB, and YedV, which also belong to two-component systems, can activate CusR via signal cross talk [1, 2]
This protein binds to the CusR box, which is a palindromic sequence also conserved in other organisms; the sequence is located in the regulatory regions of genes involved in copper-responsive systems and is regulated by proteins homologous to CusR [3] In the whole genome of Escherichia coli, only one copper box has been identified [2]
Review: [7]. Read more >

Transcription factor      
TF conformation(s):
Name Conformation Type TF-Effector Interaction Type Apo/Holo Conformation Evidence (Confirmed, Strong, Weak) References
CusR Non-Functional   Apo [BPP], [GEA], [IDA], [IPI] [1], [2]
CusR-Pasp Functional Covalent Holo [BPP], [GEA], [IDA], [IPI] [1], [2]
Evolutionary Family: OmpR
Sensing class: External-Two-component systems
Connectivity class: Local Regulator
Gene name: cusR
  Genome position: 594760-595443
  Length: 684 bp / 227 aa
Operon name: cusRS
TU(s) encoding the TF:
Transcription unit        Promoter

Regulated gene(s) cusA, cusB, cusC, cusF, cusR, cusS, cyoA, cyoB, cyoC, cyoD, cyoE, yedX
Multifun term(s) of regulated gene(s) MultiFun Term (List of genes associated to the multifun term)
membrane (7)
aerobic respiration (5)
electron acceptors (4)
Oxidoreduction-driven Active Transporters (3)
Porters (Uni-, Sym- and Antiporters) (1)
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Regulated operon(s) cusCFBA, cusRS, cyoABCDE, yedX
First gene in the operon(s) cusC, cusR, cyoA, yedX
Simple and complex regulons ArcA,CRP,Cra,CusR,FNR,Fis,Fur,GadE,PdhR,YedW
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
  CusR-Pasp activator cusCp Sigma70 -53.5 -80.5 cusC, cusF, cusB, cusA
595512 595527 [BPP], [GEA], [HIBSCS] [2], [3], [4]
  CusR-Pasp activator cusRp Sigma70 -57.5 -76.5 cusR, cusS
595512 595527 [BPP], [GEA], [HIBSCS] [2], [3], [4]
  CusR-Pasp activator cyoAp Sigma70 69.5 25.5 cyoA, cyoB, cyoC, cyoD, cyoE
451577 451592 [HIBSCS] [4]
  CusR-Pasp activator yedXp Sigma70 38.5 -78.5 yedX
2038870 2038885 [AIBSCS], [BPP], [GEA] [4]

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


 [BPP] Binding of purified proteins

 [GEA] Gene expression analysis

 [IDA] Inferred from direct assay

 [IPI] Inferred from physical interaction

 [HIBSCS] Human inference based on similarity to consensus sequences

 [AIBSCS] Automated inference based on similarity to consensus sequences


 [1] Yamamoto K., Hirao K., Oshima T., Aiba H., Utsumi R., Ishihama A., 2005, Functional characterization in vitro of all two-component signal transduction systems from Escherichia coli., J Biol Chem. 280(2):1448-56

 [2] Yamamoto K., Ishihama A., 2005, Transcriptional response of Escherichia coli to external copper., Mol Microbiol. 56(1):215-27

 [3] Munson GP., Lam DL., Outten FW., O'Halloran TV., 2000, Identification of a copper-responsive two-component system on the chromosome of Escherichia coli K-12., J Bacteriol. 182(20):5864-71

 [4] Urano H., Umezawa Y., Yamamoto K., Ishihama A., Ogasawara H., 2015, Cooperative regulation of the common target genes between H2O2-sensing YedVW and Cu2+-sensing CusSR in Escherichia coli., Microbiology. 161(Pt 4):729-38

 [5] Franke S., Grass G., Nies DH., 2001, The product of the ybdE gene of the Escherichia coli chromosome is involved in detoxification of silver ions., Microbiology. 147(Pt 4):965-72

 [6] Outten FW., Huffman DL., Hale JA., O'Halloran TV., 2001, The independent cue and cus systems confer copper tolerance during aerobic and anaerobic growth in Escherichia coli., J Biol Chem. 276(33):30670-7

 [7] Rademacher C., Masepohl B., 2012, Copper-responsive gene regulation in bacteria., Microbiology. 158(Pt 10):2451-64