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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

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

X: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

X: Cystatin-like
H: NTF2-like
T: NTF2-like
F: SnoaL_4

PF13577 CL0051

Representatives:

e2rfrA1[A:1-153] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein ; X-RAY DIFFRACTION 1.16Å

e3ejvA1[A:2-160] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized protein with cystatin-like fold ; ligands: EDO,PGE,UNL ; X-RAY DIFFRACTION 1.40Å

e3ef8A1[A:1-149] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Putative Scyalone Dehydratase ; ligands: MG,PEG,PG4,PGE ; X-RAY DIFFRACTION 1.50Å

e2chcA1[A:1-167] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN RV3472 ; X-RAY DIFFRACTION 1.690Å

e4gb5A1[A:2-149] Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED PROTEIN ; ligands: PGE,PO4 ; X-RAY DIFFRACTION 1.55Å

e2chcC1[C:7-165] Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN RV3472 ; X-RAY DIFFRACTION 1.690Å

e2chcB1[B:6-166] Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN RV3472 ; X-RAY DIFFRACTION 1.690Å

e3ef8B1[B:1-149] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative Scyalone Dehydratase ; ligands: PEG,PG4 ; X-RAY DIFFRACTION 1.50Å

e3b8lF1[F:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.75Å

e3b8lB1[B:1-144] Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein ; ligands: GOL,PEG ; X-RAY DIFFRACTION 1.75Å

e3b8lD1[D:1-144] Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.75Å

e3b8lC1[C:1-144] Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein ; ligands: GOL ; X-RAY DIFFRACTION 1.75Å

e3b8lE1[E:1-144] Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.75Å

e3a76A1[A:1-147] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Gamma-hexachlorocyclohexane dehydrochlorinase ; ligands: GOL,SPD ; X-RAY DIFFRACTION 2.25Å

e3s5cB1[B:1-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LINA ; X-RAY DIFFRACTION 3.5Å

e3a76B1[B:1-153] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Gamma-hexachlorocyclohexane dehydrochlorinase ; ligands: GOL,SPD ; X-RAY DIFFRACTION 2.25Å

e3a76C1[C:1-152] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Gamma-hexachlorocyclohexane dehydrochlorinase ; ligands: GOL,SPD ; X-RAY DIFFRACTION 2.25Å

e3s5cG1[G:1-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LINA ; X-RAY DIFFRACTION 3.5Å

e3s5cC1[C:1-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LINA ; X-RAY DIFFRACTION 3.5Å

e3s5cD1[D:1-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LINA ; X-RAY DIFFRACTION 3.5Å

e3s5cA1[A:1-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LINA ; X-RAY DIFFRACTION 3.5Å

e3s5cF1[F:1-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LINA ; X-RAY DIFFRACTION 3.5Å

e3s5cE1[E:1-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LINA ; X-RAY DIFFRACTION 3.5Å

e2rgqB1[B:1-133] Image Pymol Jmol Links: PDB, SCOP, CATH

Domain of Unknown Function with a Cystatin-Like Fold ; ligands: GOL,K,PEG ; X-RAY DIFFRACTION 1.80Å

e2rgqC1[C:1-133] Image Pymol Jmol Links: PDB, SCOP, CATH

Domain of Unknown Function with a Cystatin-Like Fold ; ligands: GOL,K ; X-RAY DIFFRACTION 1.80Å

e4l8pA1[A:0-167] Image Pymol Jmol Links: PDB, SCOP, CATH

Bile acid 7a-dehydratase, BaiE ; ligands: 1PE,NA,NI,PGE ; X-RAY DIFFRACTION 1.60Å

e4n3vA1[A:0-166] Image Pymol Jmol Links: PDB, SCOP, CATH

Bile acid 7-alpha dehydratase, BaiE ; ligands: 1PE,CIT,EDO,NA,UNL,ZN ; X-RAY DIFFRACTION 1.89Å

e4n3vB1[B:0-166] Image Pymol Jmol Links: PDB, SCOP, CATH

Bile acid 7-alpha dehydratase, BaiE ; ligands: 1PE,CIT,NA,UNL,ZN ; X-RAY DIFFRACTION 1.89Å

e5kvbA1[A:2-147] Image Pymol Jmol Links: PDB, SCOP, CATH

Gamma-hexachlorocyclohexane dehydrochlorinase ; X-RAY DIFFRACTION 1.450Å

e4lehA1[A:0-169] Image Pymol Jmol Links: PDB, SCOP, CATH

Bile acid 7-alpha dehydratase, BaiE ; ligands: SO4,ZN ; X-RAY DIFFRACTION 2.90Å

e4lehB1[B:0-169] Image Pymol Jmol Links: PDB, SCOP, CATH

Bile acid 7-alpha dehydratase, BaiE ; ligands: SO4,ZN ; X-RAY DIFFRACTION 2.90Å

e4lehC1[C:0-169] Image Pymol Jmol Links: PDB, SCOP, CATH

Bile acid 7-alpha dehydratase, BaiE ; ligands: SO4,ZN ; X-RAY DIFFRACTION 2.90Å

e5bkaA1[A:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hydroxylacyl-CoA dehydrogenase ; X-RAY DIFFRACTION 2.11Å

e5bkaB1[B:9-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hydroxylacyl-CoA dehydrogenase ; X-RAY DIFFRACTION 2.11Å

e5bkaC1[C:9-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hydroxylacyl-CoA dehydrogenase ; X-RAY DIFFRACTION 2.11Å

e5bkaD1[D:6-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hydroxylacyl-CoA dehydrogenase ; X-RAY DIFFRACTION 2.11Å

e5bkaE1[E:7-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hydroxylacyl-CoA dehydrogenase ; X-RAY DIFFRACTION 2.11Å

e5bkaF1[F:8-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hydroxylacyl-CoA dehydrogenase ; X-RAY DIFFRACTION 2.11Å

e6p77A1[A:4-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aromatic-ring-hydroxylating dioxygenase beta subunit ; ligands: GOL,PGE ; X-RAY DIFFRACTION 2.50Å

e6p77B1[B:4-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aromatic-ring-hydroxylating dioxygenase beta subunit ; ligands: PG4,PGE ; X-RAY DIFFRACTION 2.50Å

e6p7lA1[A:30-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aln2 ; ligands: GOL ; X-RAY DIFFRACTION 1.80Å

e6p7lB1[B:30-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aln2 ; X-RAY DIFFRACTION 1.80Å

e6p7lC1[C:30-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aln2 ; X-RAY DIFFRACTION 1.80Å

e6p7lD1[D:30-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aln2 ; X-RAY DIFFRACTION 1.80Å

e6p7lE1[E:30-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aln2 ; X-RAY DIFFRACTION 1.80Å

e6p7lF1[F:30-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aln2 ; X-RAY DIFFRACTION 1.80Å

e6vw4A1[A:7-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aromatic-ring-hydroxylating dioxygenase beta subunit ; ligands: SDN ; X-RAY DIFFRACTION 2.35Å

e6vw4B1[B:7-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Aromatic-ring-hydroxylating dioxygenase beta subunit ; X-RAY DIFFRACTION 2.35Å

e8abtA1[A:6-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SnoaL-like domain-containing protein ; ligands: SO4,STL ; X-RAY DIFFRACTION 1.8Å

e8abtB1[B:6-241] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SnoaL-like domain-containing protein ; ligands: SO4,STL ; X-RAY DIFFRACTION 1.8Å

e8abuA1[A:8-242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SnoaL-like domain-containing protein ; ligands: LJU ; X-RAY DIFFRACTION 1.661Å

e8abuB1[B:3-242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SnoaL-like domain-containing protein ; X-RAY DIFFRACTION 1.661Å

e8abuC1[C:7-242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SnoaL-like domain-containing protein ; X-RAY DIFFRACTION 1.661Å

e8abvA1[A:-1-242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SnoaL-like domain-containing protein ; ligands: GOL,LJL,LJU,SO4 ; X-RAY DIFFRACTION 1.683Å

e8abwA1[A:-1-240] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SnoaL-like domain-containing protein ; ligands: LHX,LJC,SO4 ; X-RAY DIFFRACTION 1.711Å

e3b8lA1[A:1-144] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein ; ligands: GOL ; X-RAY DIFFRACTION 1.75Å

e3ebyA1[A:6-162] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

beta subunit of a putative Aromatic-ring-hydroxylating dioxygenase ; ligands: CL ; X-RAY DIFFRACTION 1.75Å

e2rgqA1[A:1-133] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Domain of Unknown Function with a Cystatin-Like Fold ; ligands: GOL,K ; X-RAY DIFFRACTION 1.80Å

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.

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