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ModE DNA-binding transcriptional dual regulator

Synonyms: ModE-MoO42-, ModE
The transcription factor ModE, for Molybdenum, is the principal regulator that controls the transcription of operons involved in the transport of molybdenum and synthesis of molybdoenzymes and molybdate-related functions, among others |CITS: [8564363][8931336][8550508][9210473][10446207][10206709][9851041][11092866][12029041][16205910]|. The regulatory effect of ModE is induced when E. coli is grown under anaerobic growth conditions and when the physiological inducer, molybdenum, binds to ModE and promotes the dimerization of the ModE-Mo complex |CITS: [10446207][10206709][9210473][12583917]|. The ModE dimer binds two molecules of molybdenum with a Kd of 0.8 mM. Tungsten can act as a substitute for Mo in ModE binding to the modABCD promoter in vitro, but the complex may be biologically inactive |CITS: [11092866]|.
The binding targets for ModE consist of inverted repeat sequences that possess conserved motifs; each monomer binds to one of these conserved sequences |CITS: [14641908][10446207][9210473][10206709]|.
A crystal structure of ModE has been solved at 2.1Å resolution |CITS: [10075916]|.
The monomer of this transcription factor contains two domains: the N-terminal domain is responsible for binding DNA and the dimerization and also contains a winged helix-turn-helix motif |CITS: [10075916]|. The C-terminal domain is indispensable for molybdate binding and possibly is involved in the DNA binding |CITS: [11259434][8931336][10075916][12581638]|.
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Transcription factor      
TF conformation(s):
Name Conformation Type TF-Effector Interaction Type Apo/Holo Conformation Evidence (Confirmed, Strong, Weak) References
ModE Non-Functional   Apo [BPP], [IPI] [1], [2], [3], [4], [5]
ModE-MoO42- Functional Allosteric Holo [BPP], [IPI] [1], [2], [3], [4], [5]
Evolutionary Family: LysR
Sensing class: External sensing using transported metabolites
Connectivity class: Local Regulator
Gene name: modE
  Genome position: 793856-794644
  Length: 789 bp / 262 aa
Operon name: modEF
TU(s) encoding the TF:
Transcription unit        Promoter

Regulated gene(s) ccmA, ccmB, ccmC, ccmD, ccmE, ccmF, ccmG, ccmH, deoA, deoB, deoC, deoD, dmsA, dmsB, dmsC, hycA, hycB, hycC, hycD, hycE, hycF, hycG, hycH, hycI, moaA, moaB, moaC, moaD, moaE, modA, modB, modC, napA, napB, napC, napD, napF, napG, napH, narL, narX, oppA, oppB, oppC, oppD, oppF
Multifun term(s) of regulated gene(s) MultiFun Term (List of genes associated to the multifun term)
membrane (16)
anaerobic respiration (11)
cytochromes (10)
chaperoning, repair (refolding) (10)
fermentation (8)
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Regulated operon(s) deoCABD, dmsABC, hycABCDEFGHI, moaABCDE, modABC, napFDAGHBC-ccmABCDEFGH, narXL, oppABCDF
First gene in the operon(s) deoC, dmsA, hycA, moaA, modA, napF, napF, narX, oppA
Simple and complex regulons ArcA,Fur,Lrp,ModE
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Simple and complex regulatory phrases Regulatory phrase (List of promoters regulated by the phrase)

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
  ModE-MoO42- repressor deoCp2 Sigma70 -35.0 -80.5 deoC, deoA, deoB, deoD
4617231 4617254 [BPP], [GEA], [HIBSCS] [6]
  ModE-MoO42- repressor dmsAp2 nd -5.0 -86.5 dmsA, dmsB, dmsC
940861 940884 [BPP], [GEA], [HIBSCS], [SM] [7]
  ModE-MoO42- activator hycAp Sigma54 -192.0 -217.5 hycA, hycB, hycC, hycD, hycE, hycF, hycG, hycH, hycI
2850641 2850664 [BPP], [GEA] [8]
  ModE-MoO42- activator moaAp2 nd -57.5 -187.5 moaA, moaB, moaC, moaD, moaE
816845 816868 [BPP], [GEA] [9]
  ModE-MoO42- repressor modAp Sigma70 -4.5 -31.5 modA, modB, modC
795046 795069 [BPP], [GEA], [SM] [3]
  ModE-MoO42- activator napFp1 Sigma70 -133.5 -210.5 napF, napD, napA, napG, napH, napB, napC, ccmA, ccmB, ccmC, ccmD, ccmE, ccmF, ccmG, ccmH
2303696 2303719 [BPP], [GEA], [HIBSCS], [SM] [10], [11]
  ModE-MoO42- activator napFp2 Sigma70 -130.5 -210.5 napF, napD, napA, napG, napH, napB, napC, ccmA, ccmB, ccmC, ccmD, ccmE, ccmF, ccmG, ccmH
2303696 2303719 [BPP], [GEA], [HIBSCS], [SM] [10], [11]
  ModE-MoO42- activator narXp Sigma70 -141.5 -300.5 narX, narL
1277907 1277930 [BPP], [GEA], [HIBSCS] [8]
  ModE-MoO42- repressor oppAp Sigma28 nd nd oppA, oppB, oppC, oppD, oppF nd nd [GEA] [6]

Alignment and PSSM for ModE TFBSs    

Aligned TFBS of ModE   

Position weight matrix (PWM).   
A	0	0	4	0	4	0	3	1	6	0	3	3	3	4	0	2	6	0	4	0	4	1	0	0
C	5	0	1	0	0	0	1	1	0	4	2	1	1	2	2	0	0	2	1	1	0	2	5	0
G	1	7	0	0	3	0	3	0	1	1	2	1	3	0	1	0	1	1	1	1	0	4	0	7
T	1	0	2	7	0	7	0	5	0	2	0	2	0	1	4	5	0	4	1	5	3	0	2	0

PWM logo   


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


 [BPP] Binding of purified proteins

 [IPI] Inferred from physical interaction

 [GEA] Gene expression analysis

 [HIBSCS] Human inference based on similarity to consensus sequences

 [SM] Site mutation


 [1] Anderson LA., Palmer T., Price NC., Bornemann S., Boxer DH., Pau RN., 1997, Characterisation of the molybdenum-responsive ModE regulatory protein and its binding to the promoter region of the modABCD (molybdenum transport) operon of Escherichia coli., Eur J Biochem. 246(1):119-26

 [2] Gourley DG., Schuttelkopf AW., Anderson LA., Price NC., Boxer DH., Hunter WN., 2001, Oxyanion binding alters conformation and quaternary structure of the c-terminal domain of the transcriptional regulator mode. Implications for molybdate-dependent regulation, signaling, storage, and transport., J Biol Chem. 276(23):20641-7

 [3] Grunden AM., Self WT., Villain M., Blalock JE., Shanmugam KT., 1999, An analysis of the binding of repressor protein ModE to modABCD (molybdate transport) operator/promoter DNA of Escherichia coli., J Biol Chem. 274(34):24308-15

 [4] Hall DR., Gourley DG., Leonard GA., Duke EM., Anderson LA., Boxer DH., Hunter WN., 1999, The high-resolution crystal structure of the molybdate-dependent transcriptional regulator (ModE) from Escherichia coli: a novel combination of domain folds., EMBO J. 18(6):1435-46

 [5] Schuttelkopf AW., Boxer DH., Hunter WN., 2003, Crystal structure of activated ModE reveals conformational changes involving both oxyanion and DNA-binding domains., J Mol Biol. 326(3):761-7

 [6] Tao H., Hasona A., Do PM., Ingram LO., Shanmugam KT., 2005, Global gene expression analysis revealed an unsuspected deo operon under the control of molybdate sensor, ModE protein, in Escherichia coli., Arch Microbiol. 184(4):225-33

 [7] McNicholas PM., Chiang RC., Gunsalus RP., 1998, Anaerobic regulation of the Escherichia coli dmsABC operon requires the molybdate-responsive regulator ModE., Mol Microbiol. 27(1):197-208

 [8] Self WT., Grunden AM., Hasona A., Shanmugam KT., 1999, Transcriptional regulation of molybdoenzyme synthesis in Escherichia coli in response to molybdenum: ModE-molybdate, a repressor of the modABCD (molybdate transport) operon is a secondary transcriptional activator for the hyc and nar operons., Microbiology. 145 ( Pt 1):41-55

 [9] McNicholas PM., Rech SA., Gunsalus RP., 1997, Characterization of the ModE DNA-binding sites in the control regions of modABCD and moaABCDE of Escherichia coli., Mol Microbiol. 23(3):515-24

 [10] McNicholas PM., Gunsalus RP., 2002, The molybdate-responsive Escherichia coli ModE transcriptional regulator coordinates periplasmic nitrate reductase (napFDAGHBC) operon expression with nitrate and molybdate availability., J Bacteriol. 184(12):3253-9

 [11] Stewart V., Bledsoe PJ., Williams SB., 2003, Dual overlapping promoters control napF (periplasmic nitrate reductase) operon expression in Escherichia coli K-12., J Bacteriol. 185(19):5862-70