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
looks like an elaborated ferredoxin
contains a HTH motif
Representatives:
e3blzA1[A:3-126] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 1.75Å
e3blzH1[H:3-125] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO,PEG ; X-RAY DIFFRACTION 1.75Å
e3blzB1[B:3-126] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO,PEG ; X-RAY DIFFRACTION 1.75Å
e3blzG1[G:3-126] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO,PEG ; X-RAY DIFFRACTION 1.75Å
e3blzL1[L:3-125] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 1.75Å
e3blzE1[E:3-126] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 1.75Å
e3blzI1[I:3-125] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 1.75Å
e3blzD1[D:3-126] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 1.75Å
e3blzC1[C:3-126] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 1.75Å
e3blzK1[K:3-125] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 1.75Å
e3blzF1[F:3-125] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO,PEG ; X-RAY DIFFRACTION 1.75Å
e3blzJ1[J:3-126] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 1.75Å
e3fkaA1[A:1-119] Image Pymol Jmol Links: PDB, SCOP, CATH
uncharacterized NTF-2 like protein ; ligands: ACT,EDO,UNL ; X-RAY DIFFRACTION 1.69Å
e3dukA1[A:0-124] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 2.200Å
e3fkaB1[B:0-119] Image Pymol Jmol Links: PDB, SCOP, CATH
uncharacterized NTF-2 like protein ; ligands: ACT,EDO,UNL ; X-RAY DIFFRACTION 1.69Å
e3fkaC1[C:1-119] Image Pymol Jmol Links: PDB, SCOP, CATH
uncharacterized NTF-2 like protein ; ligands: EDO,UNL ; X-RAY DIFFRACTION 1.69Å
e3fkaD1[D:1-119] Image Pymol Jmol Links: PDB, SCOP, CATH
uncharacterized NTF-2 like protein ; ligands: EDO,UNL ; X-RAY DIFFRACTION 1.69Å
e3dukB1[B:0-124] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 2.200Å
e3dukC1[C:0-124] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 2.200Å
e3dukD1[D:0-124] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: CL,EDO ; X-RAY DIFFRACTION 2.200Å
e3dukE1[E:0-124] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; ligands: EDO ; X-RAY DIFFRACTION 2.200Å
e3dukF1[F:0-124] Image Pymol Jmol Links: PDB, SCOP, CATH
NTF2-like protein of unknown function ; X-RAY DIFFRACTION 2.200Å
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