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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative

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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

e2bnoA2[A:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: HG,SO4 ; X-RAY DIFFRACTION 1.900Å

e5v5tB1[B:4-73] Image Pymol Jmol Links: PDB, SCOP, CATH

Conserved domain protein ; X-RAY DIFFRACTION 2.150Å

e5v5tC1[C:8-73] Image Pymol Jmol Links: PDB, SCOP, CATH

Conserved domain protein ; X-RAY DIFFRACTION 2.150Å

e1zz7A2[A:7-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPHYLPHOSPHONIC ACID EPOXIDASE ; ligands: S0H ; X-RAY DIFFRACTION 2.1Å

e1zzbB2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPYLPHOSPHONIC ACID EPOXIDASE ; ligands: S0H ; X-RAY DIFFRACTION 2.3Å

e5v5tD1[D:7-73] Image Pymol Jmol Links: PDB, SCOP, CATH

Conserved domain protein ; X-RAY DIFFRACTION 2.150Å

e5v5uB2[B:10-73] Image Pymol Jmol Links: PDB, SCOP, CATH

Conserved domain protein ; X-RAY DIFFRACTION 2.280Å

e1zz7B2[B:7-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPHYLPHOSPHONIC ACID EPOXIDASE ; ligands: S0H ; X-RAY DIFFRACTION 2.1Å

e1zz6A2[A:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPYLPHOSPHONIC ACID EPOXIDASE ; X-RAY DIFFRACTION 2.0Å

e5v5uA1[A:4-73] Image Pymol Jmol Links: PDB, SCOP, CATH

Conserved domain protein ; X-RAY DIFFRACTION 2.280Å

e1zz9B2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPYLPHOSPHONIC ACID EPOXIDASE ; X-RAY DIFFRACTION 2.4Å

e2bnmB2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e1zz9C2[C:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPYLPHOSPHONIC ACID EPOXIDASE ; X-RAY DIFFRACTION 2.4Å

e1zz8B2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPYLPHOSPHONIC ACID EPOXIDASE ; ligands: S0H ; X-RAY DIFFRACTION 2.3Å

e1zzbA2[A:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPYLPHOSPHONIC ACID EPOXIDASE ; ligands: S0H ; X-RAY DIFFRACTION 2.3Å

e1zz9A2[A:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPYLPHOSPHONIC ACID EPOXIDASE ; X-RAY DIFFRACTION 2.4Å

e1zzcA2[A:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hydroxypropylphosphonic acid epoxidase ; ligands: TRS ; X-RAY DIFFRACTION 1.80Å

e2bnoB2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: HG,SO4 ; X-RAY DIFFRACTION 1.900Å

e1zz8C2[C:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPYLPHOSPHONIC ACID EPOXIDASE ; X-RAY DIFFRACTION 2.3Å

e1zz8A2[A:7-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPYLPHOSPHONIC ACID EPOXIDASE ; ligands: S0H ; X-RAY DIFFRACTION 2.3Å

e1zzcB2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hydroxypropylphosphonic acid epoxidase ; ligands: TRS ; X-RAY DIFFRACTION 1.80Å

e2bnnB2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: FCN ; X-RAY DIFFRACTION 2.500Å

e1zz6B2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROXYPROPYLPHOSPHONIC ACID EPOXIDASE ; X-RAY DIFFRACTION 2.0Å

e2bnnA2[A:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: FCN ; X-RAY DIFFRACTION 2.500Å

e3scfA2[A:6-72] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: NO,S0H ; X-RAY DIFFRACTION 2.85Å

e3scfB2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: S0H ; X-RAY DIFFRACTION 2.85Å

e3scfC2[C:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; X-RAY DIFFRACTION 2.85Å

e3scgA2[A:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: TB6 ; X-RAY DIFFRACTION 3.0Å

e3scgB2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: TB6 ; X-RAY DIFFRACTION 3.0Å

e3scgC2[C:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; X-RAY DIFFRACTION 3.0Å

e3schB2[B:6-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Epoxidase ; ligands: TB6 ; X-RAY DIFFRACTION 2.10Å

e3schA2[A:5-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Epoxidase ; ligands: TB6 ; X-RAY DIFFRACTION 2.10Å

e4j1xC2[C:4-76] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; X-RAY DIFFRACTION 2.8Å

e4j1xB2[B:2-72] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: 1JJ ; X-RAY DIFFRACTION 2.8Å

e4j1wC2[C:1-72] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Epoxidase ; X-RAY DIFFRACTION 2.71Å

e4j1wB2[B:1-72] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Epoxidase ; ligands: FFQ ; X-RAY DIFFRACTION 2.71Å

e4j1xA2[A:2-72] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPOXIDASE ; ligands: 1JJ ; X-RAY DIFFRACTION 2.8Å

e4j1wA2[A:1-72] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Epoxidase ; ligands: FFQ ; X-RAY DIFFRACTION 2.71Å

e3kz3A1[A:5-84] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Repressor protein CI ; X-RAY DIFFRACTION 1.64Å

e3bdnA2[A:1-94] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Lambda Repressor ; X-RAY DIFFRACTION 3.909Å

e1lmb41[4:6-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

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

e1lrpA1[A:6-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LAMBDA REPRESSOR ; X-RAY DIFFRACTION 3.2Å

e1lrpB1[B:6-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LAMBDA REPRESSOR ; X-RAY DIFFRACTION 3.2Å

e1lrpC1[C:6-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LAMBDA REPRESSOR ; X-RAY DIFFRACTION 3.2Å

e1rioA1[A:7-93] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

REPRESSOR PROTEIN CI ; ligands: CA,MPD ; X-RAY DIFFRACTION 2.3Å

e1rioB1[B:7-93] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

REPRESSOR PROTEIN CI ; X-RAY DIFFRACTION 2.3Å

e3kz3B1[B:5-84] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Repressor protein CI ; X-RAY DIFFRACTION 1.64Å

e3bdnB6[B:1-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Lambda Repressor ; X-RAY DIFFRACTION 3.909Å

e4ybaB1[B:4-81] Image Pymol Jmol Links: PDB, SCOP, CATH

Regulatory protein C ; X-RAY DIFFRACTION 1.7Å

e4ybaA1[A:5-81] Image Pymol Jmol Links: PDB, SCOP, CATH

Regulatory protein C ; ligands: GOL ; X-RAY DIFFRACTION 1.7Å

e6af3D1[D:2-93] Image Pymol Jmol Links: PDB, SCOP, CATH

HigA antitoxin ; X-RAY DIFFRACTION 2.8Å

e6af3B1[B:3-93] Image Pymol Jmol Links: PDB, SCOP, CATH

HigA antitoxin ; X-RAY DIFFRACTION 2.8Å

e6af3F1[F:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH

HigA antitoxin ; X-RAY DIFFRACTION 2.8Å

e6af3H1[H:8-93] Image Pymol Jmol Links: PDB, SCOP, CATH

HigA antitoxin ; X-RAY DIFFRACTION 2.8Å

e6af4B1[B:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH

HigA antitoxin ; X-RAY DIFFRACTION 2.300Å

e6af4D1[D:2-93] Image Pymol Jmol Links: PDB, SCOP, CATH

HigA antitoxin ; X-RAY DIFFRACTION 2.300Å

e6af4F1[F:3-93] Image Pymol Jmol Links: PDB, SCOP, CATH

HigA antitoxin ; X-RAY DIFFRACTION 2.300Å

e6af4H1[H:2-93] Image Pymol Jmol Links: PDB, SCOP, CATH

HigA antitoxin ; X-RAY DIFFRACTION 2.300Å

e6ltyA1[A:36-113] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA3 ; X-RAY DIFFRACTION 3.277Å

e6ltyB1[B:36-113] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA3 ; X-RAY DIFFRACTION 3.277Å

e6ltzA1[A:36-113] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA3 ; ligands: GOL ; X-RAY DIFFRACTION 1.97Å

e6ltzB1[B:34-109] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA3 ; ligands: EPE,PEG ; X-RAY DIFFRACTION 1.97Å

e7n10B1[B:1-66] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ComR ; X-RAY DIFFRACTION 1.65Å

e7t8iA1[A:0-64] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage element (ICEBs1)transcriptional regulator (Xre family) ; X-RAY DIFFRACTION 2.10Å

e7ewdA1[A:27-101] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 3.2Å

e7t8iB1[B:0-64] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage element (ICEBs1)transcriptional regulator (Xre family) ; X-RAY DIFFRACTION 2.10Å

e7ewcA1[A:31-100] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 2.05Å

e7ewcB1[B:34-101] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 2.05Å

e7ewcC1[C:33-101] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 2.05Å

e7ewcD1[D:33-100] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 2.05Å

e7ewdB1[B:27-101] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 3.2Å

e7ewdC1[C:31-101] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 3.2Å

e7ewdD1[D:34-101] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 3.2Å

e7eweA1[A:31-101] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 3.4Å

e7eweB1[B:31-100] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 3.4Å

e7eweC1[C:31-100] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 3.4Å

e7eweD1[D:33-101] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 3.4Å

e7eweE1[E:30-101] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative antitoxin HigA2 ; X-RAY DIFFRACTION 3.4Å

e8dtqA1[A:1-86] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: CL,NA ; X-RAY DIFFRACTION 1.45Å

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

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