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CecR DNA-binding transcriptional repressor

Synonyms: CecR
Summary:
CecR belongs to the TetR family of transcription factors, and because this family forms dimers under physiological conditions, it is proposed that the CecR transcription factor must have a dimeric form [2]
One strong and unique binding site is located within the intergenic spacer between the divergently transcribed ybiH-ybhGFSR and rhlE operons; the spaces includes a 20-bp-long palindromic inverted repeat sequence, AATTAGTTtactAACTAATT, referred to as the CecR box [1]
CecR controls genes involved in the control of sensitivity to cefoperazone and chloramphenicol [1]
CecR (Cefoperazone and chloramphenicol Regulator of sensitivity) [1]


Transcription factor      
TF conformation(s):
Name Conformation Type TF-Effector Interaction Type Apo/Holo Conformation Evidence (Confirmed, Strong, Weak) References
CecR     nd nd
Connectivity class: Local Regulator
Gene name: cecR
  Genome position: 829972-830643
  Length: 672 bp / 223 aa
Operon name: cecR-ybhGFSR
TU(s) encoding the TF:
Transcription unit        Promoter
cecR-ybhGFSR
cecRp


Regulon       
Regulated gene(s) cecR, ybhF, ybhG, ybhR, ybhS
Multifun term(s) of regulated gene(s) MultiFun Term (List of genes associated to the multifun term)
ABC superfamily, membrane component (2)
membrane (2)
Transcription related (1)
transcriptional level (1)
ABC superfamily ATP binding cytoplasmic component (1)
Regulated operon(s) cecR-ybhGFSR
First gene in the operon(s) cecR
Simple and complex regulons CecR
Simple and complex regulatory phrases Regulatory phrase (List of promoters regulated by the phrase)
[CecR,-](1)


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
  CecR repressor cecRp Sigma70 2.5 -24.5 cecR, ybhG, ybhF, ybhS, ybhR
agtcataatcTTAATCAATCATTTGATTAAgaatggactg
830658 830677 [BPP], [GEA], [HIBSCS] [1]


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


Evidence    

 [BPP] Binding of purified proteins

 [GEA] Gene expression analysis

 [HIBSCS] Human inference based on similarity to consensus sequences



Reference(s)    

 [1] Yamanaka Y., Shimada T., Yamamoto K., Ishihama A., 2016, Transcription factor CecR (YbiH) regulates a set of genes affecting the sensitivity of Escherichia coli against cefoperazone and chloramphenicol., Microbiology. 162(7):1253-64

 [2] Ramos JL., Martinez-Bueno M., Molina-Henares AJ., Teran W., Watanabe K., Zhang X., Gallegos MT., Brennan R., Tobes R., 2005, The TetR family of transcriptional repressors., Microbiol Mol Biol Rev. 69(2):326-56



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