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:
e3cmmA3[A:914-1024]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.700Å
e8se9A1[A:901-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8sebA2[A:901-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8sv8A2[A:901-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8wwxA1[A:1-93] Image Pymol Jmol Links: PDB, SCOP, CATH
; SOLUTION NMR
e3cmmC1[C:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.700Å
e4nnjA1[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: GOL ; X-RAY DIFFRACTION 2.4Å
e4nnjC4[C:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: GOL ; X-RAY DIFFRACTION 2.4Å
e4ii2A2[A:903-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: EDO ; X-RAY DIFFRACTION 2.200Å
e5knlA2[A:903-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.5Å
e5knlD2[D:903-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.5Å
e4ii3C2[C:903-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: CA ; X-RAY DIFFRACTION 2.900Å
e5l6jA5[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.68Å
e5l6hA5[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.3Å
e5l6hC1[C:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: MG ; X-RAY DIFFRACTION 2.3Å
e5l6iA5[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: GOL ; X-RAY DIFFRACTION 2.76Å
e5l6iC5[C:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.76Å
e5l6jC3[C:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.68Å
e5um6A1[A:903-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: 8E7 ; X-RAY DIFFRACTION 2.794Å
e5tr4A2[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.200Å
e5tr4C6[C:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.200Å
e6dc6A1[A:942-1057] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-like modifier-activating enzyme 1 ; X-RAY DIFFRACTION 3.150Å
e6dc6C3[C:942-1057] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-like modifier-activating enzyme 1 ; X-RAY DIFFRACTION 3.150Å
e6o82A1[A:903-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: SO4 ; X-RAY DIFFRACTION 2.60Å
e6o82C1[C:903-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: SO4 ; X-RAY DIFFRACTION 2.60Å
e6o83A4[A:903-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: MPD,TRS ; X-RAY DIFFRACTION 3.15Å
e6o83C4[C:903-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: MPD,TRS ; X-RAY DIFFRACTION 3.15Å
e6nyaA6[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 2.07Å
e6nyaD6[D:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 2.07Å
e4ii3A4[A:903-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; ligands: CA ; X-RAY DIFFRACTION 2.900Å
e6zqhA4[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.026Å
e6zqhC3[C:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.026Å
e7k5jD3[D:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.42Å
e7k5jA1[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.42Å
e7k5jC6[C:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.42Å
e7k5jG3[G:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.42Å
e7k5jI2[I:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.42Å
e7k5jK4[K:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.42Å
e7k5jS6[S:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.42Å
e7k5jU4[U:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.42Å
e6zhtC4[C:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH
Ubiquitin-activating enzyme E1 1 ; ligands: GOL ; X-RAY DIFFRACTION 2.300Å
e6zhsA2[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 2.350Å
e6zhuA2[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.18Å
e6zhuE2[E:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.18Å
e6zhuC6[C:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.18Å
e6zhuG6[G:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 3.18Å
e7zh9A1[A:914-1024] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-activating enzyme E1 1 ; X-RAY DIFFRACTION 1.705Å
e7pvnA3[A:941-1051] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-like modifier-activating enzyme 6 ; X-RAY DIFFRACTION 2.71Å
e7pvnB4[B:941-1048] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-like modifier-activating enzyme 6 ; X-RAY DIFFRACTION 2.71Å
e7pyvA1[A:941-1050] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-like modifier-activating enzyme 6,Ubiquitin-like modifier-activating enzyme 1,Ubiquitin-like modifier-activating enzyme 6 ; X-RAY DIFFRACTION 3.268Å
e7pyvB2[B:941-1050] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-like modifier-activating enzyme 6,Ubiquitin-like modifier-activating enzyme 1,Ubiquitin-like modifier-activating enzyme 6 ; X-RAY DIFFRACTION 3.268Å
e7solA1[A:941-1050] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-like modifier-activating enzyme 6 ; X-RAY DIFFRACTION 2.25Å
e7solC3[C:941-1048] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ubiquitin-like modifier-activating enzyme 6 ; X-RAY DIFFRACTION 2.25Å
e8seaA2[A:901-1012] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY

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