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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: Ribbon-helix-helix
F: RHH_1

PF01402 CL0057

Representatives:

e2cpgA1[A:1-43] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; ligands: CL ; X-RAY DIFFRACTION 1.6Å

e7wj0A1[A:4-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin MazE6 ; SOLUTION NMR

e3h87D1[D:2-73] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative uncharacterized protein ; X-RAY DIFFRACTION 1.490Å

e3h87C1[C:2-73] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative uncharacterized protein ; ligands: GOL,IMD ; X-RAY DIFFRACTION 1.490Å

e7wj0B1[B:4-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin MazE6 ; SOLUTION NMR

e7wnrB1[B:4-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin MazE6 ; SOLUTION NMR

e7wnrC1[C:4-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin MazE6 ; SOLUTION NMR

e8u12B1[B:2-50] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 1.60Å

e8u12C1[C:2-50] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 1.60Å

e8u12D1[D:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH

; ligands: SO4 ; X-RAY DIFFRACTION 1.60Å

e8u12E1[E:2-50] Image Pymol Jmol Links: PDB, SCOP, CATH

; X-RAY DIFFRACTION 1.60Å

e8u12F1[F:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH

; ligands: SO4 ; X-RAY DIFFRACTION 1.60Å

e8u12G1[G:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH

; ligands: SO4 ; X-RAY DIFFRACTION 1.60Å

e8u12H1[H:2-50] Image Pymol Jmol Links: PDB, SCOP, CATH

; ligands: SO4 ; X-RAY DIFFRACTION 1.60Å

e1ea4L1[L:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.95Å

e1ea4G1[G:1-42] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.95Å

e1ea4E1[E:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.95Å

e1ea4J1[J:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.95Å

e1ea4D1[D:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.95Å

e2cpgB1[B:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; ligands: CL ; X-RAY DIFFRACTION 1.6Å

e1b01A1[A:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.56Å

e1ea4B1[B:1-41] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.95Å

e1ea4A1[A:2-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.95Å

e1ea4H1[H:2-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.95Å

e1ea4K1[K:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.95Å

e1b01B1[B:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.56Å

e1ea4F1[F:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; X-RAY DIFFRACTION 2.95Å

e2cpgC1[C:1-42] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSCRIPTIONAL REPRESSOR COPG ; ligands: CL ; X-RAY DIFFRACTION 1.6Å

e2bj1B1[B:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; X-RAY DIFFRACTION 3.0Å

e2bj3D1[D:2-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; ligands: MG ; X-RAY DIFFRACTION 2.2Å

e2bj3B1[B:2-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; ligands: CL,MG ; X-RAY DIFFRACTION 2.2Å

e2bj7B1[B:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; ligands: CL,PG4 ; X-RAY DIFFRACTION 2.1Å

e2bj8A1[A:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; ligands: CL,EPE,PG4 ; X-RAY DIFFRACTION 2.1Å

e2bj1A1[A:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; ligands: CL ; X-RAY DIFFRACTION 3.0Å

e2bj9B1[B:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; ligands: NI,PO4 ; X-RAY DIFFRACTION 3.0Å

e2bj3C1[C:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; ligands: CL ; X-RAY DIFFRACTION 2.2Å

e2bj8B1[B:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; ligands: CL,NI ; X-RAY DIFFRACTION 2.1Å

e2bj3A1[A:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; X-RAY DIFFRACTION 2.2Å

e2bj9A1[A:1-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; ligands: PG4,PO4 ; X-RAY DIFFRACTION 3.0Å

e2cajA1[A:9-58] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; X-RAY DIFFRACTION 2.35Å

e2ca9B1[B:9-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: FMT ; X-RAY DIFFRACTION 2.05Å

e2cadA1[A:9-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; X-RAY DIFFRACTION 2.3Å

e2cajB1[B:9-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: GOL ; X-RAY DIFFRACTION 2.35Å

e2wvbB1[B:9-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; X-RAY DIFFRACTION 1.9Å

e2wvcA1[A:8-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: SO4 ; X-RAY DIFFRACTION 2.1Å

e2wvdA1[A:6-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: SO4 ; X-RAY DIFFRACTION 2.65Å

e2wvdB1[B:9-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.65Å

e2wvdC1[C:8-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.65Å

e2wvdD1[D:8-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.65Å

e2wveA1[A:9-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.3Å

e2wveB1[B:9-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.3Å

e2wvfA1[A:9-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: FMT,SO4 ; X-RAY DIFFRACTION 1.6Å

e2wvfB1[B:9-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: FMT ; X-RAY DIFFRACTION 1.6Å

e3lghB1[B:9-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

nickel-responsive regulator ; X-RAY DIFFRACTION 2.37Å

e4me7F1[F:7-85] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin EndoAI ; X-RAY DIFFRACTION 2.918Å

e4me7E1[E:6-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin EndoAI ; X-RAY DIFFRACTION 2.918Å

e3lghA3[A:10-57] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

nickel-responsive regulator ; X-RAY DIFFRACTION 2.37Å

e2cadB3[B:9-57] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: FMT ; X-RAY DIFFRACTION 2.3Å

e2wvcB3[B:9-57] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: SO4 ; X-RAY DIFFRACTION 2.1Å

e2ca9A3[A:8-57] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; ligands: FMT ; X-RAY DIFFRACTION 2.05Å

e2wvbA3[A:8-57] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; X-RAY DIFFRACTION 1.9Å

e2mdvA1[A:1-38] Image Pymol Jmol Links: PDB, SCOP, CATH

Designed protein ; SOLUTION NMR

e2mdvB1[B:1-38] Image Pymol Jmol Links: PDB, SCOP, CATH

Designed protein ; SOLUTION NMR

e3phtA1[A:29-52] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PUTATIVE NICKEL-RESPONSIVE REGULATOR ; X-RAY DIFFRACTION 2.04Å

e6mrjA1[A:8-58] Image Pymol Jmol Links: PDB, SCOP, CATH

Nickel-responsive regulator ; X-RAY DIFFRACTION 2.80Å

e6mrjB2[B:7-57] Image Pymol Jmol Links: PDB, SCOP, CATH

Nickel-responsive regulator ; ligands: MG ; X-RAY DIFFRACTION 2.80Å

e6mrjC1[C:7-58] Image Pymol Jmol Links: PDB, SCOP, CATH

Nickel-responsive regulator ; ligands: MG ; X-RAY DIFFRACTION 2.80Å

e6mrjD2[D:6-59] Image Pymol Jmol Links: PDB, SCOP, CATH

Nickel-responsive regulator ; X-RAY DIFFRACTION 2.80Å

e4hv0B1[B:2-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AVTR ; X-RAY DIFFRACTION 2.6Å

e4hv0D1[D:2-100] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AVTR ; X-RAY DIFFRACTION 2.6Å

e4hv0C2[C:2-100] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AVTR ; X-RAY DIFFRACTION 2.6Å

e4hv0A2[A:2-99] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AVTR ; X-RAY DIFFRACTION 2.6Å

e6iyaF1[F:3-51] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator CopG family ; X-RAY DIFFRACTION 3.0Å

e6iyaA1[A:2-49] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator CopG family ; X-RAY DIFFRACTION 3.0Å

e6iyaB1[B:2-49] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator CopG family ; X-RAY DIFFRACTION 3.0Å

e6iyaC1[C:5-49] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator CopG family ; X-RAY DIFFRACTION 3.0Å

e6iyaD1[D:3-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator CopG family ; X-RAY DIFFRACTION 3.0Å

e6iyaE1[E:3-50] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator CopG family ; X-RAY DIFFRACTION 3.0Å

e7etrB1[B:5-51] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Transcriptional regulator CopG family ; X-RAY DIFFRACTION 3.80Å

e1q5vB1[B:1-48] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nickel responsive regulator ; X-RAY DIFFRACTION 2.3Å

e2hzaB1[B:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL-RESPONSIVE REGULATOR ; ligands: 3CM ; X-RAY DIFFRACTION 2.1Å

e5x3tA1[A:1-70] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin VapB26 ; X-RAY DIFFRACTION 2.650Å

e5x3tC1[C:1-70] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin VapB26 ; X-RAY DIFFRACTION 2.650Å

e5x3tE1[E:1-61] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin VapB26 ; X-RAY DIFFRACTION 2.650Å

e5x3tG1[G:1-61] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antitoxin VapB26 ; X-RAY DIFFRACTION 2.650Å

e2bj7A1[A:1-50] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL RESPONSIVE REGULATOR ; ligands: CL,EDO,PG4 ; X-RAY DIFFRACTION 2.1Å

e2hzaA1[A:1-48] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

NICKEL-RESPONSIVE REGULATOR ; ligands: 3CM ; X-RAY DIFFRACTION 2.1Å

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