Home Help

X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative

Keyword search

Evolutionary classification of protein domain structures

alpha arraysalpha-helix arrays with mainly perpendicular helices

X: HTH
H: HTH
T: tetra-helical, lambda repressor-like
F: HTH_3

PF01381 CL0123

Representatives:

e2r1jL1[L:3-68] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Repressor protein C2 ; X-RAY DIFFRACTION 1.53Å

e2b5aA1[A:1-77] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

C.BclI ; ligands: ACY ; X-RAY DIFFRACTION 1.54Å

e2ictA1[A:8-94] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

antitoxin higa ; X-RAY DIFFRACTION 1.630Å

e2bnmA2[A:6-76] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: SO4 ; X-RAY DIFFRACTION 1.7Å

e1lmb31[3:6-92] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (LAMBDA REPRESSOR) ; X-RAY DIFFRACTION 1.800Å

e1y9qA2[A:4-82] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

transcriptional regulator, HTH_3 family ; ligands: MED ; X-RAY DIFFRACTION 1.9Å

e1b0nA1[A:1-68] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (SINR PROTEIN) ; ligands: ZN ; X-RAY DIFFRACTION 1.900Å

e1utxA1[A:1-66] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CYLR2 ; ligands: IOD,NA ; X-RAY DIFFRACTION 1.900Å

e2ppxA1[A:30-91] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED PROTEIN ATU1735 ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.0Å

e3ivpA1[A:3-76] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

PUTATIVE TRANSPOSON-RELATED DNA-BINDING PROTEIN ; X-RAY DIFFRACTION 2.02Å

e4rykA1[A:2-70] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Lmo0325 protein ; ligands: SUC ; X-RAY DIFFRACTION 2.09Å

e8eztC1[C:0-69] Image Pymol Jmol Links: PDB, SCOP, CATH

; ligands: CL ; X-RAY DIFFRACTION 2.06Å

e8eztD1[D:0-69] Image Pymol Jmol Links: PDB, SCOP, CATH

; ligands: CL ; X-RAY DIFFRACTION 2.06Å

e8eztA1[A:1-69] Image Pymol Jmol Links: PDB, SCOP, CATH

; ligands: CL ; X-RAY DIFFRACTION 2.06Å

e8dtqB1[B:2-84] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: NA ; X-RAY DIFFRACTION 1.45Å

e4yv6B2[B:4-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; ligands: SO4 ; X-RAY DIFFRACTION 2.05Å

e4yv6D2[D:4-65] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; ligands: SO4 ; X-RAY DIFFRACTION 2.05Å

e4yv6A1[A:6-65] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; X-RAY DIFFRACTION 2.05Å

e4yv6C1[C:5-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; X-RAY DIFFRACTION 2.05Å

e4yv9A2[A:5-65] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e4yv9B1[B:5-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e4yv9C2[C:4-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; X-RAY DIFFRACTION 1.95Å

e4yv9D1[D:4-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e2axuL1[L:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2axuK1[K:4-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2axuB1[B:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2awiC1[C:3-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2axzB1[B:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 3.0Å

e2awiL1[L:4-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2axzA1[A:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 3.0Å

e2awiI1[I:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2awiB1[B:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2axuJ1[J:4-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2aw6B1[B:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.00Å

e2axuD1[D:3-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2axuH1[H:3-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2axuC1[C:3-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2axuE1[E:3-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2awiG1[G:4-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2axuF1[F:3-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2axvC1[C:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2axvB1[B:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2awiE1[E:3-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2axzD1[D:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 3.0Å

e2aw6A1[A:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.00Å

e2awiD1[D:3-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2axvA1[A:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2awiJ1[J:4-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2awiK1[K:4-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2axuI1[I:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2axuG1[G:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2axzC1[C:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 3.0Å

e2awiF1[F:3-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2axuA1[A:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PRGX ; X-RAY DIFFRACTION 2.9Å

e2axvD1[D:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2awiH1[H:4-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e2grmA1[A:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2grlA1[A:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2grmB1[B:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2grlB1[B:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2grlC1[C:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2grlD1[D:2-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2grmC1[C:1-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 3.0Å

e2ef8A1[A:5-88] Image Pymol Jmol Links: PDB, SCOP, CATH

PUTATIVE TRANSCRIPTION FACTOR ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e2ef8B1[B:5-87] Image Pymol Jmol Links: PDB, SCOP, CATH

PUTATIVE TRANSCRIPTION FACTOR ; X-RAY DIFFRACTION 1.95Å

e5w4mA2[A:3-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; ligands: GOL,K,SCN ; X-RAY DIFFRACTION 2.3880Å

e5w4mB2[B:3-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; ligands: K,SCN ; X-RAY DIFFRACTION 2.3880Å

e5w4nA1[A:2-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; ligands: DMS,GOL ; X-RAY DIFFRACTION 2.1980Å

e5w4nB1[B:3-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; ligands: DMS,GOL ; X-RAY DIFFRACTION 2.1980Å

e6w1aB2[B:4-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; X-RAY DIFFRACTION 2.8Å

e6w1fA1[A:4-69] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Positive transcriptional regulator MutR family ; X-RAY DIFFRACTION 3.200Å

e6w1fB1[B:4-69] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Positive transcriptional regulator MutR family ; X-RAY DIFFRACTION 3.200Å

e6w1aA2[A:3-68] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; X-RAY DIFFRACTION 2.8Å

e7zcvB2[B:3-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; X-RAY DIFFRACTION 1.9Å

e7zcvA1[A:5-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator ; X-RAY DIFFRACTION 1.9Å

e2ofyB1[B:5-84] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative XRE-family transcriptional regulator ; X-RAY DIFFRACTION 1.7Å

e5woqA1[A:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH

Transcriptional regulator ClgR ; X-RAY DIFFRACTION 1.90Å

e5woqB1[B:1-85] Image Pymol Jmol Links: PDB, SCOP, CATH

Transcriptional regulator ClgR ; X-RAY DIFFRACTION 1.90Å

e5woqC1[C:3-85] Image Pymol Jmol Links: PDB, SCOP, CATH

Transcriptional regulator ClgR ; X-RAY DIFFRACTION 1.90Å

e6rnzA1[A:1-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HTH-type transcriptional regulator DdrOC ; ligands: GOL ; X-RAY DIFFRACTION 1.35Å

e6rnzB1[B:1-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HTH-type transcriptional regulator DdrOC ; ligands: GOL ; X-RAY DIFFRACTION 1.35Å

e6rmqA1[A:2-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HTH-type transcriptional regulator DdrOC ; X-RAY DIFFRACTION 3Å

e6rmqB1[B:2-67] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HTH-type transcriptional regulator DdrOC ; X-RAY DIFFRACTION 3Å

e6rnxA1[A:1-70] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HTH-type transcriptional regulator DdrOC ; X-RAY DIFFRACTION 2.84Å

e6rnxB1[B:1-70] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HTH-type transcriptional regulator DdrOC ; X-RAY DIFFRACTION 2.84Å

e6jq1B1[B:11-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator, XRE family ; ligands: LI ; X-RAY DIFFRACTION 2.3Å

e6jq1A1[A:11-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator, XRE family ; ligands: LI ; X-RAY DIFFRACTION 2.3Å

e7ab4A1[A:36-107] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Predicted transcriptional regulator, XRE family ; X-RAY DIFFRACTION 3.240Å

e7ab3A1[A:38-107] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Predicted transcriptional regulator, XRE family ; X-RAY DIFFRACTION 2.400Å

e7ab3D1[D:39-107] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Predicted transcriptional regulator, XRE family ; X-RAY DIFFRACTION 2.400Å

e7ab4D1[D:36-107] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Predicted transcriptional regulator, XRE family ; X-RAY DIFFRACTION 3.240Å

e7ab5A1[A:38-107] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Predicted transcriptional regulator, XRE family ; X-RAY DIFFRACTION 2.900Å

e7ab5D1[D:38-107] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Predicted transcriptional regulator, XRE family ; X-RAY DIFFRACTION 2.900Å

e2croA1[A:1-63] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

REGULATORY PROTEIN CRO ; X-RAY DIFFRACTION

e3croL1[L:1-63] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (434 CRO) ; X-RAY DIFFRACTION 2.500Å

e1zugA1[A:3-65] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PHAGE 434 CRO PROTEIN ; SOLUTION NMR

e1sq8A1[A:1-63] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

dh434 ; SOLUTION NMR

e4ghjA1[A:2-74] Image Pymol Jmol Links: PDB, SCOP, CATH

Probable transcriptional regulator ; X-RAY DIFFRACTION 1.75Å

e2xcjA1[A:3-85] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

C PROTEIN ; ligands: NA ; X-RAY DIFFRACTION 1.8Å

e3mlfB1[B:-7-84] Image Pymol Jmol Links: PDB, SCOP, CATH

transcriptional regulator ; X-RAY DIFFRACTION 2.600Å

e3mlfC1[C:-7-84] Image Pymol Jmol Links: PDB, SCOP, CATH

transcriptional regulator ; X-RAY DIFFRACTION 2.600Å

e2l49B1[B:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

C protein ; SOLUTION NMR

e2xcjB1[B:2-84] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

C PROTEIN ; ligands: FMT,GOL,NA ; X-RAY DIFFRACTION 1.8Å

e4ghjB2[B:2-77] Image Pymol Jmol Links: PDB, SCOP, CATH

Probable transcriptional regulator ; X-RAY DIFFRACTION 1.75Å

e3mlfA2[A:-9-62] Image Pymol Jmol Links: PDB, SCOP, CATH

transcriptional regulator ; X-RAY DIFFRACTION 2.600Å

e3mlfD2[D:-7-63] Image Pymol Jmol Links: PDB, SCOP, CATH

transcriptional regulator ; X-RAY DIFFRACTION 2.600Å

e2l49A1[A:1-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

C protein ; SOLUTION NMR

e3mlfE1[E:0-85] Image Pymol Jmol Links: PDB, SCOP, CATH

transcriptional regulator ; X-RAY DIFFRACTION 2.600Å

e2jvlA1[A:49-155] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TrMBF1 ; SOLUTION NMR

e2awiA1[A:2-66] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PrgX ; X-RAY DIFFRACTION 2.25Å

e4jcxB1[B:1-95] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Csp231I C protein ; X-RAY DIFFRACTION 2.30Å

e4jqdE1[E:1-97] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Csp231I C protein ; X-RAY DIFFRACTION 2.75Å

e1r69A1[A:1-63] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

REPRESSOR PROTEIN CI ; X-RAY DIFFRACTION

e1x57A1[A:8-85] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Endothelial differentiation-related factor 1 ; SOLUTION NMR

F: Unmapped domains

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.

T: DNA-binding domain of intron-encoded endonucleases

lacks the N-terminal helix, circularly permuted wing

alpha bundlesalpha-helix bundles with mainly parallel helices

alpha superhelicesrepeating alpha-helix hairpins form a superhelix

alpha duplicates or obligate multimersalpha duplicates or monomers associate together to form a compact domain

alpha complex topologyalpha domain with complex and unique topology that cannot be described as array or bundle or superhelix

beta barrelssingle beta-sheet folded upon itself to form a barrel

beta meanderssingle beta-sheet with mainly meander topology

beta sandwichestwo beta-sheets stacked together to form a sandwich

beta duplicates or obligate multimersbeta duplicates or monomers associate together to form a compact domain

beta complex topologybeta domains with complex and unique topology that cannot be described as barrel or sandwich or meander

a+b two layersone alpha-helix layer and one beta-sheet layer

a+b three layersone mainly antiparallel beta-sheet layer sandwiched between two alpha-helix layers

a+b four layerstwo beta-sheet layers sandwiched between two alpha-helix layers

a+b complex topologyalpha and beta domain with complex and unique topology that cannot be described in layers

a+b duplicates or obligate multimersalpha and beta duplicates or monomers associated together to form a compact domain

a/b barrelsrepeating beta-alpha units form a barrel

a/b three-layered sandwichesrepeating beta-alpha units form a sandwich with a mainly parallel beta-sheet layer stacked between two alpha-helix layers

mixed a+b and a/balpha and beta domain consists of both a+b and a/b regions

few secondary structure elementsstabilized by cofactors or disulfides

extended segmentsextended, non-globular segments, frequently bind to other proteins to form complexes