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MazE DNA-binding transcriptional repressor

Synonyms: MazE
Summary:
MazE is an antitoxin that counteracts the MazF toxin [2, 3]. MazF exhibits ribonuclease activity toward single stranded RNA regions of sequence ACA, and the resulting degradation of cellular mRNA causes global translation inhibition []. MazF exhibits RNase activity toward tmRNA, and tmRNA is involved in release of MazF-mediated cell growth inhibition [4]. The mazEF system causes a "programmed cell death" response to stresses including starvation [3] and antibiotics []. The antitoxin, MazE, is subject to degradation by the ClpAP protease complex and exhibits a short (30 minute) half life, whereas the toxin, MazF, is much more stable [3].
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Transcription factor      
TF conformation(s):
Name Conformation Type TF-Effector Interaction Type Apo/Holo Conformation Evidence (Confirmed, Strong, Weak) References
MazE Functional   nd nd
Evolutionary Family: MazE
Connectivity class: Local Regulator
Gene name: mazE
  Genome position: 2911091-2911339
  Length: 249 bp / 82 aa
Operon name: relA-mazEFG
TU(s) encoding the TF:
Transcription unit        Promoter
mazEFG
mazEp1
mazEFG
mazEp2
relA-mazEF
relAp1
relA-mazEF
relAp2


Regulon       
Regulated gene(s) mazE, mazF, mazG
Multifun term(s) of regulated gene(s) MultiFun Term (List of genes associated to the multifun term)
starvation (3)
defense/survival (2)
other (mechanical, nutritional, oxidative stress) (2)
cell killing (2)
drug resistance/sensitivity (2)
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Regulated operon(s) relA-mazEFG
First gene in the operon(s) mazE, mazE
Simple and complex regulons Fis,MazE,MazE-MazF
Simple and complex regulatory phrases Regulatory phrase (List of promoters regulated by the phrase)
[MazE-MazF,-](2)


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
  MazE repressor mazEp1 nd -21.0 -50.5 mazE, mazF, mazG
tgtagatacaGTATATATCAATCTACATTGTAGATACgagcaaattt
2911376 2911403 [BCE], [GEA], [SM] [1]
  MazE repressor mazEp1 nd -7.0 -36.5 mazE, mazF, mazG
aaccgctatcATATGTAGATACAGTATATATCAATctacattgta
2911363 2911388 [BCE], [GEA], [SM] [1], [2]
  MazE repressor mazEp2 nd -34.0 -50.5 mazE, mazF, mazG
tgtagatacaGTATATATCAATCTACATTGTAGATACgagcaaattt
2911376 2911403 [BCE], [GEA], [SM] [1]
  MazE repressor mazEp2 nd -20.0 -36.5 mazE, mazF, mazG
aaccgctatcATATGTAGATACAGTATATATCAATctacattgta
2911363 2911388 [BCE], [GEA], [SM] [1], [2]


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


Evidence    

 [BCE] Binding of cellular extracts

 [GEA] Gene expression analysis

 [SM] Site mutation



Reference(s)    

 [1] Marianovsky I., Aizenman E., Engelberg-Kulka H., Glaser G., 2001, The regulation of the Escherichia coli mazEF promoter involves an unusual alternating palindrome., J Biol Chem 276(8):5975-84

 [2] Masuda Y., Miyakawa K., Nishimura Y., Ohtsubo E., 1993, chpA and chpB, Escherichia coli chromosomal homologs of the pem locus responsible for stable maintenance of plasmid R100., J Bacteriol 175(21):6850-6

 [3] Aizenman E., Engelberg-Kulka H., Glaser G., 1996, An Escherichia coli chromosomal "addiction module" regulated by guanosine [corrected] 3',5'-bispyrophosphate: a model for programmed bacterial cell death., Proc Natl Acad Sci U S A 93(12):6059-63

 [4] Christensen SK., Pedersen K., Hansen FG., Gerdes K., 2003, Toxin-antitoxin loci as stress-response-elements: ChpAK/MazF and ChpBK cleave translated RNAs and are counteracted by tmRNA., J Mol Biol 332(4):809-19

 [5] Pedersen K., Christensen SK., Gerdes K., 2002, Rapid induction and reversal of a bacteriostatic condition by controlled expression of toxins and antitoxins., Mol Microbiol 45(2):501-10

 [6] Kamada K., Hanaoka F., Burley SK., 2003, Crystal structure of the MazE/MazF complex: molecular bases of antidote-toxin recognition., Mol Cell 11(4):875-84

 [7] Loris R., Marianovsky I., Lah J., Laeremans T., Engelberg-Kulka H., Glaser G., Muyldermans S., Wyns L., 2003, Crystal structure of the intrinsically flexible addiction antidote MazE., J Biol Chem 278(30):28252-7

 [8] Metzger S., Dror IB., Aizenman E., Schreiber G., Toone M., Friesen JD., Cashel M., Glaser G., 1988, The nucleotide sequence and characterization of the relA gene of Escherichia coli., J Biol Chem 263(30):15699-704



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