Transcription Factors

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 Eukaryotic type
   Basic leucine zipper (bZIP)
     AP-1(-like) components, Jun
     AP-1(-like) components, Fos
     AP-1(-like) components, Maf
     AP-1(-like) components, NF-E2
       K09039  NFE2; nuclear factor erythroid 2
       K09040  NFE2L1_3; nuclear factor erythroid 2-related factor 1/3
       K05638  NFE2L2, NRF2; nuclear factor erythroid 2-related factor 2
       K09041  NFE2N, CNC; nuclear factor erythroid 2, invertebrate
       K09042  BACH; transcription regulator BACH
     AP-1(-like) components, Fungal regulators
     AP-1(-like) components, CRE-BP/ATF
     CREB
     C/EBP-like factors
     bZIP/PAR
     Plant bZIP factors
     ZIP only
   Basic helix-loop-helix (bHLH)
     Ubiquitous (class A) factors
     Myogenic transcription factors
     Achaete-Scute
     Tal/Twist/Atonal/Hen, Lymphoid factors
     Tal/Twist/Atonal/Hen, Mesodermal Twist-like factors
     Tal/Twist/Atonal/Hen, HEN
     Tal/Twist/Atonal/Hen, Mesp
     Tal/Twist/Atonal/Hen, Atonal
     Tal/Twist/Atonal/Hen, Pancreatic factors
     Hairy, Hairy/E(SPL)
       K06054  HES1; hairy and enhancer of split 1
       K09087  HES2_6_7; hairy and enhancer of split 2/6/7
       K09088  HES3; hairy and enhancer of split 3
       K09089  HES4; hairy and enhancer of split 4
       K06055  HES5; hairy and enhancer of split 5
       K09090  HESN; hairy and enhancer of split, invertebrate
       K09091  HEY; hairy and enhancer of split related with YRPW motif
       K03729  BHLHB2, DEC1; class B basic helix-loop-helix protein 2
       K03730  BHLHB3, DEC2; class B basic helix-loop-helix protein 3
       K09092  TCFL5, CHA; transcription factor-like 5
       K27237  CWO; transcription factor CWO
     Hairy, Fungal regulators
     Factors with PAS domain
     Yabby
     INO
     HLH domain only
   Basic helix-loop-helix/leucine zipper (bHLH-ZIP)
   Other basic domains
   Zinc finger
     Cys4 thyroid hormone receptor-like
       K05547  THRA, NR1A1; thyroid hormone receptor alpha
       K08362  THRB, NR1A2; thyroid hormone receptor beta
       K08527  RARA, NR1B1; retinoic acid receptor alpha
       K08528  RARB, NR1B2; retinoic acid receptor beta
       K08529  RARG, NR1B3; retinoic acid receptor gamma
       K07294  NR1C1, PPARA; peroxisome proliferator-activated receptor alpha
       K04504  NR1C2, PPARD; peroxisome proliferator-activated receptor delta
       K08530  NR1C3, PPARG; peroxisome proliferator-activated receptor gamma
       K03728  NR1D1; nuclear receptor subfamily 1 group D member 1
       K08531  NR1D2; nuclear receptor subfamily 1 group D member 2
       K08701  NR1D3; nuclear receptor subfamily 1 group D member 3
       K08532  NR1F1, RORA; RAR-related orphan receptor alpha
       K08533  NR1F2, RORB; RAR-related orphan receptor beta
       K08534  NR1F3, RORC; RAR-related orphan receptor gamma
       K14033  NR1F4; nuclear receptor subfamily 1 group F member 4
       K08536  NR1H3, LXRA; liver X receptor alpha
       K08535  NR1H2, LXRB; liver X receptor beta
       K08537  NR1H4, FXR; farnesoid X receptor
       K08538  NR1H5, FXRB; farnesoid X receptor beta
       K14034  NR1H1, EcR; ecdysone receptor
       K08539  VDR, NR1I1; vitamin D3 receptor
       K08540  NR1I2, PXR; pregnane X receptor
       K08541  NR1I3, CAR; constitutive androstane receptor
       K14035  NR1IN; nuclear receptor subfamily 1 group I
     Cys4 hepatocyte nuclear factor 4-like
     Cys4 estrogen receptor-like
       K08550  ESR1, NR3A1; estrogen receptor alpha
       K08551  ESR2, NR3A2; estrogen receptor beta
       K08552  NR3B1, ESRRA; estrogen-related receptor alpha
       K08553  NR3B2, ESRRB; estrogen-related receptor beta
       K08554  NR3B3, ESRRG; estrogen-related receptor gamma
       K08703  NR3BN, ERR; estrogen-related receptor ERR
       K05771  NR3C1, GR; glucocorticoid receptor
       K08555  NR3C2, MR; mineralocorticoid receptor
       K08556  PGR, NR3C3; progesterone receptor
       K08557  AR, NR3C4; androgen receptor
     Cys4 nerve growth factor IB-like
     Cys4 Fushi tarazu-F1-like
     Cys4 germ cell nuclear factor
     Cys4 Knirps/DAX1-like
     Cys4 GATA-factors
     Cys2His2 SP/KLF family and related proteins
       K04684  SP1; transcription factor Sp1
       K09192  SP2; transcription factor Sp2
       K09193  SP3; transcription factor Sp3
       K09194  SP4; transcription factor Sp4
       K09195  SP5; transcription factor Sp5
       K09196  SP6; transcription factor Sp6
       K09197  SP7; transcription factor Sp7
       K09198  SP8; transcription factor Sp8
       K09199  SP9; transcription factor Sp9
       K09200  SP-N; transcription factor Sp, invertebrate
       K09204  KLF1; krueppel-like factor 1
       K17845  KLF2; krueppel-like factor 2
       K15605  KLF3; krueppel-like factor 3
       K17846  KLF4; krueppel-like factor 4
       K09206  KLF5; krueppel-like factor 5
       K09207  KLF6_7; krueppel-like factor 6/7
       K09205  KLF8_12; krueppel-like factor 8/12
       K09208  KLF9S, BTEB; krueppel-like factor 9/13/14/16
       K09209  KLF10_11, TIEG; krueppel-like factor 10/11
       K09210  KLF15; krueppel-like factor 15
       K09211  KLF17; krueppel-like factor 17
       K09203  EGR1; early growth response protein 1
       K12496  EGR2; early growth response protein 2
       K12497  EGR3; early growth response protein 3
       K12498  EGR4; early growth response protein 4
       K09202  SWI5; regulatory protein SWI5
       K09234  WT1; Wilms tumor protein 1
       K27541  ZFX_Y; zinc finger X/Y-chromosomal protein
       K12379  HKB; huckebein
     Cys2His2 GLI-like
     Cys2His2 Snail
     Cys2His2 BTB-ZF factors
     Cys2His2 BED
     Cys2His2 PRDM
     Cys2His2 metabolic regulators in fungi
     Cys2His2 others
     Cys2HisCys zinc factors
     Cys3His zinc factors
     Cys2CysHis zinc factors
     CXXC CpG-binding proteins
     Cys6 metabolic regulators in fungi
     Other zinc fingers
   Helix-turn-helix
     Homeo domain ANTP: HOXL
       K21950  HOXA9; homeobox protein Hox-A9
       K09294  HOX_9; homeobox protein HoxB/C/D9
       K17443  HOXA10; homrobox protein Hox-A10
       K17444  HOXC10; homrobox protein Hox-C10
       K09295  HOXD10; homrobox protein Hox-D10
       K21951  HOXA11; homeobox protein Hox-A11
       K09296  HOX_11; homeobox protein HoxC/D11
       K09297  HOX_12; homeobox protein HoxC/D12
       K09298  HOX_13; homeobox protein HoxA/B/C/D13
       K09301  HOX_1; homeobox protein HoxA/B/D1
       K09302  HOX_2; homeobox protein HoxA/B2
       K09303  HOX_3; homeobox protein HoxA/B/D3
       K09304  HOX_4; homeobox protein HoxA/B/C/D4
       K09305  HOX_5; homeobox protein HoxA/B/C5
       K09306  HOX_6; homeobox protein HoxA/B/C6
       K09307  HOX_7; homeobox protein HoxA/B7
       K09308  HOX_8; homeobox protein HoxB/C/D8
       K09310  GSH; homeobox protein GSH
       K07594  IPF1, PDX1; insulin promoter factor 1
       K09312  CDX1_4; homeobox protein CDX1/4
       K22234  CDX2; homeobox protein CDX2
       K09320  EVX; homeobox even-skipped homolog protein
       K09321  GBX; homeobox protein GBX
       K08025  HLXB9, HB9; homeobox protein HB9
       K09322  MEOX, MOX; homeobox protein MOX
       K09300  ABDB; homeobox protein abdominal-B and related proteins
       K18659  BCD; homeotic protein bicoid
     Homeo domain ANTP: NKL
     Homeo domain Paired-related
       K09452  ARX; homeobox protein aristaless-related
       K09323  ALX3; homeobox protein aristaless-like 3
       K09451  ALX4; homeobox protein aristaless-like 4
       K09324  GSC; homeobox protein goosecoid
       K09325  GSCL; homeobox protein goosecoid-like
       K09326  OTX1; homeobox protein OTX1
       K18490  OTX2; homeobox protein OTX2
       K09327  PROP1; homeobox protein prophet of Pit-1
       K09328  UNC4; homeobox protein Unc-4
       K09329  PRRX, PMX; paired mesoderm homeobox protein
       K09330  PHOX2, PMX2; paired mesoderm homeobox protein 2
       K09331  SHOX; short stature homeobox protein
       K09332  RAX, RX; retina and anterior neural fold homeobox protein
       K09333  RAXL; retina and anterior neural fold homeobox-like protein
       K09334  ALX1, CART1; ALX homeobox protein 1
       K09335  VSX1; visual system homeobox protein 1
       K09336  VSX2, CHX10; visual system homeobox protein 2
       K09337  CRX; cone-rod homeobox protein
       K18491  ESX1; homeobox protein ESX1
       K24199  NOBOX; homeobox protein NOBOX
       K09356  PITX1; paired-like homeodomain transcription factor 1
       K04686  PITX2; paired-like homeodomain transcription factor 2
       K09357  PITX3; paired-like homeodomain transcription factor 3
       K09354  HESX1; homeobox protein expressed in ES cells 1
       K24892  ARGFX; arginine-fifty homeobox
       K24893  DMBX1; diencephalon/mesencephalon homeobox protein 1
       K24894  DPRX; divergent paired-related homeobox
       K24895  DRGX, PRRXL1; dorsal root ganglia homeobox protein
       K24896  DUX; double homeobox protein
       K24897  HOPX; homeodomain-only protein
       K24898  ISX; intestine-specific homeobox
       K24899  LEUTX; leucine-twenty homeobox
       K24900  MIXL1; homeobox protein MIXL1
       K24901  OTP; homeobox protein orthopedia
       K24902  RHOXF1; rhox homeobox family member 1
       K24903  RHOXF2; rhox homeobox family member 2
       K24904  SEBOX; homeobox protein SEBOX
       K24905  TPRX1; tetra-peptide repeat homeobox protein 1
       K09382  PAX1_9; paired box protein 1/9
       K15608  PAX2; paired box protein 2
       K09381  PAX3_7; paired box protein 3/7
       K08032  PAX4; paired box protein 4
       K09383  PAX5; paired box protein 5
       K08031  PAX6; paired box protein 6
       K09293  PAX8; paired box protein 8
     Homeo domain LIM
     Homeo domain POU
     Homeo domain SINE
     Homeo domain ZF
     Homeo domain CUT
     Homeo domain PROS
     Homeo domain TALE
     Homeo domain other
     Fork head/winged helix developmental regulators
     Fork head/winged helix tissue-specific regulators
     Fork head/winged helix cell cycle-controlling factors, E2F
     Fork head/winged helix cell cycle-controlling factors, DP
     Fork head/winged helix other regulators
     Stork head/winged helix factors
     Heat shock factors
     Tryptophan clusters Myb, Myb-factors
       K09420  MYB, C-MYB; transcriptional activator Myb
       K09421  MYBL1, A-MYB; myb-related protein A
       K21769  MYBL2, B-MYB; myb-related protein B
       K09422  MYBP; transcription factor MYB, plant
       K23865  MYB30; transcription factor MYB30
       K16166  PAP1, MYB75; transcription factor MYB75
       K12133  LHY; MYB-related transcription factor LHY
       K12134  CCA1; circadian clock associated 1
     Tryptophan clusters Myb, Myb-like factors
     Tryptophan clusters Ets-type
     Tryptophan clusters interferon-regulating factors
     TEA domain
     ARID
   beta-Scaffold factors with minor groove contacts
     RHR (Rel homology region) Rel/Ankyrin
       K02580  NFKB1; nuclear factor NF-kappa-B p105 subunit
       K04469  NFKB2; nuclear factor of kappa light polypeptide gene enhancer in B-cells 2
       K04735  RELA; transcription factor p65
       K09253  RELB; transcription factor RelB
       K09254  REL; c-Rel proto-oncogene protein
     RHR (Rel homology region) Ankyrin only
     RHR (Rel homology region) NF-AT
     STAT
     p53
     MADS-box regulators of differentiation, MEF-2
     MADS-box regulators of differentiation, Homeotic genes
     MADS-box regulators of differentiation, Yeast regulators
     MADS-box responders to external signals
     SAND domain-containing proteins
     TATA-binding proteins
     HMG SOX
     HMG TCF-1
     HMG TOX
       K28489  TOX; thymocyte selection-associated high mobility group box protein
       K11651  SMARCE1; SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily E member 1
       K24660  HMG20A; high mobility group protein 20A
       K24650  HMG20B; SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily E member 1-related
     HMG2-related
       K09272  SSRP1, POB3; FACT complex subunit SSRP1/POB3
     UBF
     Other HMG box factors
     Heteromeric CCAAT factors
     Grainyhead
       K09275  TFCP2; transcription factor CP2 and related proteins
     Cold-shock domain factors, DbpA-like
     Cold-shock domain factors, YB-1/DbpB-like
     Cold-shock domain factors, FRG Y2-like
     Runt
       K08367  RUNX1, AML1; runt-related transcription factor 1
       K09278  RUNX2, AML3; runt-related transcription factor 2
       K09279  RUNX3, AML2; runt-related transcription factor 3
       K20213  RUN; RUNX transcription factor Runt
       K20214  LZ; RUNX transcription factor Lozenge
       K09280  RUNXA_B; runt-related transcription factor
     MYRF
   Other transcription factors
     HMGI(Y)
     NUPR
     Pocket domain Rb
     Pocket domain CBP
     T-box
     DMRT
       K19488  DMRT1; doublesex- and mab-3-related transcription factor 1
       K19489  DMRT2; doublesex- and mab-3-related transcription factor 2
       K19490  DMRT3; doublesex- and mab-3-related transcription factor 3
       K19491  DMRT4_5, DMRTA; doublesex- and mab-3-related transcription factor 4/5
       K19492  DMRT6, DMRTB; doublesex- and mab-3-related transcription factor 6
       K19493  DMRT7, DMRTC2; doublesex- and mab-3-related transcription factor 7
       K19494  DMRT8, DMRTC1; doublesex- and mab-3-related transcription factor 8
     LRRFIP
     TCP
     AP2/ERF
       K09284  AP2; AP2-like factor, euAP2 lineage
       K09285  OVM, ANT; AP2-like factor, ANT lineage
       K09287  RAV; RAV-like factor
       K09286  EREBP; EREBP-like factor
       K14516  ERF1; ethylene-responsive transcription factor 1
       K14517  ERF2; ethylene-responsive transcription factor 2
       K14507  ORCA2_3; AP2-domain DNA-binding protein ORCA2/3
       K13432  PTI4; pathogenesis-related genes transcriptional activator PTI4
       K13433  PTI5; pathogenesis-related genes transcriptional activator PTI5
       K13434  PTI6; pathogenesis-related genes transcriptional activator PTI6
     WRKY
     LOB
     GRAS
     NAC
     Copper-fist proteins fungal regulators
     Others
 
 Prokaryotic type
   Helix-turn-helix
     AraC family
     LysR family
     DeoR family
     LacI family
     GntR family
     TetR/AcrR family
     Lrp/AsnC family
     LuxR family
     MarR family
     MerR family
     Fur family
     IclR family
     CRP/FNR family
     Rrf2 family
     ArsR family
     XRE family
     PadR family
     Other families
       K26252  dtxR, ideR; DtxR family transcriptional regulator, iron-dependent repressor
       K03709  troR, sirR, scaR, mntR; DtxR family transcriptional regulator, Mn-dependent transcriptional regulator
       K11924  mntR; DtxR family transcriptional regulator, manganese transport regulator
       K23238  rpiR, alsR; RpiR family transcriptional regulator, repressor of rpiB and als operon
       K03481  glvR; RpiR family transcriptional regulator, glv operon transcriptional regulator
       K15835  murR; RpiR family transcriptional regulator, murPQ operon repressor
       K19337  hexR; RpiR family transcriptional regulator, carbohydrate utilization regulator
       K02171  blaI; BlaI family transcriptional regulator, penicillinase repressor
       K02546  mecI; BlaI family transcriptional regulator, methicillin resistance regulatory protein
       K03524  birA; BirA family transcriptional regulator, biotin operon repressor / biotin---[acetyl-CoA-carboxylase] ligase [EC:6.3.4.15]
       K03557  fis; Fis family transcriptional regulator, factor for inversion stimulation protein
       K03720  trpR; TrpR family transcriptional regulator, trp operon repressor
       K02688  prpR; transcriptional regulator, propionate catabolism operon regulatory protein
       K07724  ner, nlp, sfsB; Ner family transcriptional regulator
       K11925  sgrR; SgrR family transcriptional regulator
       K06211  nadR; HTH-type transcriptional regulator, transcriptional repressor of NAD biosynthesis genes [EC:2.7.7.1 2.7.1.22]
       K13655  mqsA; HTH-type transcriptional regulator / antitoxin MqsA
       K14056  puuR; HTH-type transcriptional regulator, repressor for puuD
       K15773  hipB; HTH-type transcriptional regulator / antitoxin HipB
       K18830  pezA; HTH-type transcriptional regulator / antitoxin PezA
       K20480  nprR, nprA; HTH-type transcriptional regulator, quorum sensing regulator NprR
       K20342  comR; HTH-type transcriptional regulator, regulator for ComX
       K20373  rgg2; HTH-type transcriptional regulator, SHP2-responsive activator
       K20374  rgg3; HTH-type transcriptional regulator, SHP3-responsive repressor
       K22299  rghR; HTH-type transcriptional regulator, competence development regulator
       K22300  dicA; HTH-type transcriptional regulator, cell division transcriptional repressor
       K20391  plcR; HTH-type transcriptional regulator, pleiotropic regulator of extracellular virulence genes
       K20375  ropB, rgg1; HTH-type transcriptional regulator, pheromone-responsive regulator
       K20380  traA; HTH-type transcriptional regulator, pheromone-responsive repressor
       K18831  higA; HTH-type transcriptional regulator / antitoxin HigA
       K20388  cylR2; HTH-type transcriptional regulator, cytolysin regulator
       K20377  prgX; HTH-type transcriptional regulator, major conjugation operon repressor
       K21557  susR; HTH-type transcriptional regulator, polysaccharide utilization system transcription regulator
       K09720  nrpRI; HTH-type transcriptional regulator, global nitrogen regulator NrpRI
       K22109  gbsR; HTH-type transcriptional regulator, glycine betaine synthesis regulator
       K22301  opcR; HTH-type transcriptional regulator, osmoprotectant uptake regulator
       K23356  trmB; HTH-type transcriptional regulator, sugar sensing transcriptional regulator
       K06930  bat; HTH-type transcriptional regulator, bacterioopsin transcriptional activator and related proteins
       K23348  dmsR; HTH-type transcriptional regulator, dimethyl sulfoxide reductase transcription regulator
       K09714  tfx; HTH-type transcriptional regulator, fmd operon transcriptional regulator
       K09685  purR; HTH-type transcriptional regulator, purine operon repressor
       K26599  gfcR; HTH-type transcriptional regulator, activator of D-glucose/D-fructose catabolism
       K10941  flrA, fleQ, flaK; sigma-54 dependent transcriptional regulator, flagellar regulatory protein
       K18219  txr; sigma-54 dependent transcriptional regulator, tetracycline resistant transcriptional regulator
       K20919  vpsR, cpsR; sigma-54 dependent transcriptional regulator, positive regulator of biofilm formation
       K17473  dgaR; sigma-54 dependent transcriptional regulator, dga operon transcriptional activator
       K19505  gfrR; sigma-54 dependent transcriptional regulator, gfr operon transcriptional activator
       K21405  acoR; sigma-54 dependent transcriptional regulator, acetoin dehydrogenase operon transcriptional activator AcoR
       K11908  vasH; sigma-54 dependent transcriptional regulator
       K11917  sfa3; sigma-54 dependent transcriptional regulator
       K11914  sfa2; sigma-54 dependent transcriptional regulator
       K26990  rsoA; sigma-O factor regulatory protein RsoA
       K12146  hyfR; hydrogenase-4 transcriptional activator
       K12266  norR; anaerobic nitric oxide reductase transcription regulator
       K15836  fhlA; formate hydrogenlyase transcriptional activator
       K02584  nifA; Nif-specific regulatory protein
       K02647  cdaR; carbohydrate diacid regulator
       K06714  rocR; arginine utilization regulatory protein
       K02019  modE; molybdate transport system regulatory protein
       K01926  rex; redox-sensing transcriptional repressor
       K03706  codY; transcriptional pleiotropic repressor
       K17071  dcmR; transcriptional repressor of dcmA and dcmR
       K07725  csa3; CRISPR-associated protein Csa3
       K21829  dauR; D-arginine utilization repressor
       K27097  espR; ESX-1-secreted protein regulator
       K07726  K07726; putative transcriptional regulator
       K07727  K07727; putative transcriptional regulator
       K07728  K07728; putative transcriptional regulator
       K07729  K07729; putative transcriptional regulator
       K07730  K07730; putative transcriptional regulator
       K07731  K07731; putative transcriptional regulator
   Ribbon-helix-helix
   Other transcription factors

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Last updated: July 7, 2026
Classification taken and modified from TRANSFAC 7.0