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
Representatives:
e1phzA1[A:19-115] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PROTEIN (PHENYLALANINE HYDROXYLASE) ; X-RAY DIFFRACTION 2.2Å
e1ygyA1[A:452-529] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
D-3-phosphoglycerate dehydrogenase ; X-RAY DIFFRACTION 2.3Å
e1ygyB1[B:452-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
D-3-phosphoglycerate dehydrogenase ; ligands: TAR ; X-RAY DIFFRACTION 2.3Å
e3dc2A1[A:452-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
D-3-PHOSPHOGLYCERATE DEHYDROGENASE ; ligands: SER ; X-RAY DIFFRACTION 2.7Å
e3dc2B1[B:452-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
D-3-PHOSPHOGLYCERATE DEHYDROGENASE ; ligands: SER,TLA ; X-RAY DIFFRACTION 2.7Å
e3ddnA1[A:452-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
D-3-PHOSPHOGLYCERATE DEHYDROGENASE ; X-RAY DIFFRACTION 2.4Å
e3ddnB1[B:452-529] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
D-3-PHOSPHOGLYCERATE DEHYDROGENASE ; ligands: TLA ; X-RAY DIFFRACTION 2.4Å
e2jheA1[A:1-74] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRANSCRIPTION REGULATOR TYRR ; ligands: AE3 ; X-RAY DIFFRACTION 2.30Å
e2jheB1[B:1-74] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRANSCRIPTION REGULATOR TYRR ; ligands: AE3,SO4 ; X-RAY DIFFRACTION 2.30Å
e2jheC1[C:1-74] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRANSCRIPTION REGULATOR TYRR ; ligands: PG4 ; X-RAY DIFFRACTION 2.30Å
e2jheD1[D:1-74] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRANSCRIPTION REGULATOR TYRR ; ligands: PG4 ; X-RAY DIFFRACTION 2.30Å
e3mtjA5[A:352-435] Image Pymol Jmol Links: PDB, SCOP, CATH
Homoserine dehydrogenase ; X-RAY DIFFRACTION 2.150Å
e6dzsA3[A:354-438] Image Pymol Jmol Links: PDB, SCOP, CATH
Homoserine dehydrogenase ; X-RAY DIFFRACTION 2.620Å
e6dzsB1[B:354-438] Image Pymol Jmol Links: PDB, SCOP, CATH
Homoserine dehydrogenase ; X-RAY DIFFRACTION 2.620Å
e6dzsC2[C:354-438] Image Pymol Jmol Links: PDB, SCOP, CATH
Homoserine dehydrogenase ; X-RAY DIFFRACTION 2.620Å
e6dzsD2[D:354-438] Image Pymol Jmol Links: PDB, SCOP, CATH
Homoserine dehydrogenase ; X-RAY DIFFRACTION 2.620Å
e3nrbA2[A:3-86] Image Pymol Jmol Links: PDB, SCOP, CATH
Formyltetrahydrofolate deformylase ; ligands: EDO ; X-RAY DIFFRACTION 2.05Å
e3obiA2[A:3-87] Image Pymol Jmol Links: PDB, SCOP, CATH
Formyltetrahydrofolate deformylase ; ligands: EDO ; X-RAY DIFFRACTION 1.95Å
e3nrbB1[B:5-83] Image Pymol Jmol Links: PDB, SCOP, CATH
Formyltetrahydrofolate deformylase ; ligands: EDO ; X-RAY DIFFRACTION 2.05Å
e3nrbC1[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH
Formyltetrahydrofolate deformylase ; X-RAY DIFFRACTION 2.05Å
e3nrbD1[D:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH
Formyltetrahydrofolate deformylase ; ligands: EDO ; X-RAY DIFFRACTION 2.05Å
e3obiB1[B:3-87] Image Pymol Jmol Links: PDB, SCOP, CATH
Formyltetrahydrofolate deformylase ; ligands: EDO ; X-RAY DIFFRACTION 1.95Å
e3obiC1[C:3-87] Image Pymol Jmol Links: PDB, SCOP, CATH
Formyltetrahydrofolate deformylase ; ligands: EDO ; X-RAY DIFFRACTION 1.95Å
e3obiD1[D:3-87] Image Pymol Jmol Links: PDB, SCOP, CATH
Formyltetrahydrofolate deformylase ; ligands: EDO ; X-RAY DIFFRACTION 1.95Å
e3w7bA1[A:1-87] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLTETRAHYDROFOLATE DEFORMYLASE ; X-RAY DIFFRACTION 2.71Å
e3w7bB1[B:1-87] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FORMYLTETRAHYDROFOLATE DEFORMYLASE ; X-RAY DIFFRACTION 2.71Å
e7alzA1[A:186-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Prephenate dehydratase ; ligands: PHE ; X-RAY DIFFRACTION 1.67Å
e7alzB1[B:186-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Prephenate dehydratase ; ligands: PHE ; X-RAY DIFFRACTION 1.67Å
e4go7X6[X:-17-93] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Aspartokinase ; ligands: THR ; X-RAY DIFFRACTION 2.0Å
e4go5X1[X:-17-93] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Aspartokinase ; X-RAY DIFFRACTION 2.6Å
e2qmwA1[A:185-264] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PREPHENATE DEHYDRATASE ; ligands: EDO ; X-RAY DIFFRACTION 2.3Å
e2j0wA1[A:295-385] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LYSINE-SENSITIVE ASPARTOKINASE 3 ; X-RAY DIFFRACTION 2.5Å
e3l76A2[A:259-353] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Aspartokinase ; ligands: LYS,SO4,THR ; X-RAY DIFFRACTION 2.54Å
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
looks like an elaborated ferredoxin
contains a HTH motif
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