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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

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

X: HAD domain-like
H: HAD domain-related
T: HAD-like
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.

Representatives:

e1y8aA1[A:1-308] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

hypothetical protein AF1437 ; ligands: MG ; X-RAY DIFFRACTION 1.4Å

e6nq4B1[B:83-194] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HAD superfamily hydrolase ; ligands: EDO,NA,PO4 ; X-RAY DIFFRACTION 1.450Å

e3eprA1[A:73-181] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Hydrolase, haloacid dehalogenase-like family ; ligands: GOL ; X-RAY DIFFRACTION 1.550Å

e3pdwA2[A:74-182] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized hydrolase yutF ; ligands: GOL ; X-RAY DIFFRACTION 1.596Å

e6cgkA1[A:15-210] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

effector protein Lem4 (lpg1101) ; ligands: GOL,MG,PO4 ; X-RAY DIFFRACTION 1.668Å

e3rf6B1[B:82-246] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein YKR070W ; ligands: FLC,G3P,MG ; X-RAY DIFFRACTION 1.70Å

e6iahA1[A:1-14,A:128-240] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hydrolase ; ligands: CL,MG ; X-RAY DIFFRACTION 1.750Å

e4jdpA1[A:73-184] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

P-NITROPHENYL PHOSPHATASE (PHO2) ; ligands: CL ; X-RAY DIFFRACTION 1.76Å

e2c4nA3[A:71-175] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN NAGD ; ligands: PO4 ; X-RAY DIFFRACTION 1.8Å

e1zjjA2[A:69-187] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL PROTEIN PH1952 ; X-RAY DIFFRACTION 1.85Å

e6aokA1[A:-8-204] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ceg4 ; ligands: CL,MG,TRS ; X-RAY DIFFRACTION 1.88Å

e3ewiA1[A:5-164] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

N-acylneuraminate cytidylyltransferase ; X-RAY DIFFRACTION 1.900Å

e2x4dA1[A:82-189] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

PHOSPHOLYSINE PHOSPHOHISTIDINE INORGANIC PYROPHOSPHATE PHOSPHATASE ; ligands: EPE,GOL,POP ; X-RAY DIFFRACTION 1.920Å

e4iftA2[A:72-180] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Thermostable NPPase ; X-RAY DIFFRACTION 1.9950Å

e2hx1A2[A:82-203] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Predicted sugar phosphatases of the HAD superfamily ; ligands: CL,EDO,EPE ; X-RAY DIFFRACTION 2.100Å

e2obbA1[A:1-122] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL PROTEIN ; ligands: MG ; X-RAY DIFFRACTION 2.2Å

e2ho4A2[A:75-179] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Haloacid dehalogenase-like hydrolase domain containing 2 ; X-RAY DIFFRACTION 2.200Å

e4i9fB3[B:73-185] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLYCEROL 3-PHOSPHATE PHOSPHATASE ; X-RAY DIFFRACTION 2.21Å

e1wviA3[A:1072-1180] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

putative phosphatases involved in N-acetyl-glucosamine catabolism ; X-RAY DIFFRACTION 2.3Å

e3hltA2[A:75-179] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HDHD2 ; ligands: SO4 ; X-RAY DIFFRACTION 2.3Å

e1ltqA2[A:153-301] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYNUCLEOTIDE KINASE ; X-RAY DIFFRACTION 2.33Å

e1rc8A2[A:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYNUCLEOTIDE KINASE ; ligands: CA ; X-RAY DIFFRACTION 2.75Å

e1rpzA2[A:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYNUCLEOTIDE KINASE ; ligands: CA ; X-RAY DIFFRACTION 2.9Å

e1rrcA2[A:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

POLYNUCLEOTIDE KINASE ; ligands: CA ; X-RAY DIFFRACTION 2.46Å

e2ia5A2[A:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,MG,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5B2[B:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,MG,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5C2[C:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,MG,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5D2[D:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,MG,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5E2[E:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,MG,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5F2[F:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5G2[G:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5H2[H:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,MG,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5I2[I:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5J2[J:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,MG,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5K2[K:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: ARS,SO4 ; X-RAY DIFFRACTION 2.9Å

e2ia5L2[L:153-301] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Polynucleotide kinase ; ligands: SO4 ; X-RAY DIFFRACTION 2.9Å

e1vjrA3[A:73-183] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

4-nitrophenylphosphatase ; X-RAY DIFFRACTION 2.400Å

e1ys9A1[A:72-180] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Protein SPy1043 ; X-RAY DIFFRACTION 2.56Å

e1ydfA1[A:73-181] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

hydrolase, haloacid dehalogenase-like family ; X-RAY DIFFRACTION 2.600Å

e4bkmA2[A:88-134,A:155-222] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PYRIDOXAL PHOSPHATE PHOSPHATASE, PHOSPHOGLYCOLATE PHOSPHATASE, PYRIDOXAL PHOSPHATE PHOSPHATASE ; ligands: NO3 ; X-RAY DIFFRACTION 2.65Å

e5aesA1[A:87-209] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PYRIDOXAL PHOSPHATE PHOSPHATASE ; ligands: 5B0 ; X-RAY DIFFRACTION 2.75Å

e1yv9A1[A:74-182] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

hydrolase, haloacid dehalogenase family ; ligands: PO4 ; X-RAY DIFFRACTION 2.8Å

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