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




Representatives:
e5ljxA2[A:319-415]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
Envelopment polyprotein ; X-RAY DIFFRACTION 1.4Å
e5ljyA2[A:319-414] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelopment polyprotein ; ligands: NCO ; X-RAY DIFFRACTION 3Å
e5ljzA2[A:319-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelopment polyprotein ; X-RAY DIFFRACTION 1.60Å
e5lk0A2[A:319-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelopment polyprotein ; X-RAY DIFFRACTION 1.8Å
e5lk1A1[A:319-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelopment polyprotein ; X-RAY DIFFRACTION 1.70Å
e5lk2A1[A:319-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelopment polyprotein ; X-RAY DIFFRACTION 1.6Å
e5lk3A1[A:319-415] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelopment polyprotein ; X-RAY DIFFRACTION 1.5Å
e5j81A2[A:976-1076] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelopment polyprotein ; ligands: ACT,P33,SO4 ; X-RAY DIFFRACTION 1.800Å
e5j9hA2[A:976-1078] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelopment polyprotein ; ligands: SO4 ; X-RAY DIFFRACTION 2.500Å
e6y5wB1[B:969-1069] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein,Envelope polyprotein ; X-RAY DIFFRACTION 2.550Å
e6y68A1[A:969-1069] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein ; X-RAY DIFFRACTION 2.400Å
e6y6qA1[A:969-1069] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein ; ligands: SO4 ; X-RAY DIFFRACTION 2.700Å
e6y5fB1[B:969-1071] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein,Envelope polyprotein ; X-RAY DIFFRACTION 3.200Å
e6y62B2[B:969-1083] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein,Envelope polyprotein ; X-RAY DIFFRACTION 2.200Å
e6zjmB2[B:969-1071] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein ; ELECTRON MICROSCOPY
e6zjmD2[D:969-1071] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein ; ELECTRON MICROSCOPY
e6zjmF2[F:969-1071] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein ; ELECTRON MICROSCOPY
e6zjmH1[H:969-1071] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein,Envelope polyprotein ; ELECTRON MICROSCOPY
e7b09A2[A:976-1078] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein ; ELECTRON MICROSCOPY
e7b0aA1[A:976-1078] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein ; ELECTRON MICROSCOPY
e7b0aD2[D:976-1078] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein ; ELECTRON MICROSCOPY
e6z06A1[A:976-1078] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Envelope polyprotein ; X-RAY DIFFRACTION 3.50Å
e7qqbB2[B:976-1093] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; X-RAY DIFFRACTION 2.600Å

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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
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