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:
e2b9bB2[B:363-431]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
FUSION GLYCOPROTEIN F0 ; X-RAY DIFFRACTION 2.85Å
e4mmrB2[B:401-462]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain ; X-RAY DIFFRACTION 3.1Å
e1g5gA2[A:382-437]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
Fusion glycoprotein F0 ; X-RAY DIFFRACTION 3.30Å
e8dngD2[D:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e8dngG2[G:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e8do4A2[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e8do4B2[B:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e8do4C1[C:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e8do4D1[D:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e8do4E2[E:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e8do4G1[G:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e8fmxB1[B:370-429] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8fmxC1[C:370-429] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8fmyB1[B:374-433] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8fmyC1[C:374-433] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8dnrB1[B:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e8dnrE1[E:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e8t9zA2[A:370-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; X-RAY DIFFRACTION 2.99Å
e1g5gB1[B:382-437] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; X-RAY DIFFRACTION 3.30Å
e4mmvB2[B:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain ; X-RAY DIFFRACTION 2.8Å
e4mmqB1[B:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain ; ligands: SO4 ; X-RAY DIFFRACTION 3.25Å
e5l1xB2[B:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
hMPV F1 subunit ; X-RAY DIFFRACTION 3.300Å
e5l1xD1[D:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
hMPV F1 subunit ; X-RAY DIFFRACTION 3.300Å
e5l1xF1[F:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
hMPV F1 subunit ; X-RAY DIFFRACTION 3.300Å
e5l1xH1[H:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
hMPV F1 subunit ; X-RAY DIFFRACTION 3.300Å
e5l1xJ2[J:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
hMPV F1 subunit ; X-RAY DIFFRACTION 3.300Å
e5l1xL1[L:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
hMPV F1 subunit ; X-RAY DIFFRACTION 3.300Å
e4ccfA1[A:401-465] Image Pymol Jmol Links: PDB, SCOP, CATH
FUSION GLYCOPROTEIN F0 ; X-RAY DIFFRACTION 2.65Å
e4ccfB2[B:401-464] Image Pymol Jmol Links: PDB, SCOP, CATH
FUSION GLYCOPROTEIN F0 ; X-RAY DIFFRACTION 2.65Å
e4ccfC2[C:401-465] Image Pymol Jmol Links: PDB, SCOP, CATH
FUSION GLYCOPROTEIN F0 ; ligands: SO4 ; X-RAY DIFFRACTION 2.65Å
e4ccfD2[D:401-469] Image Pymol Jmol Links: PDB, SCOP, CATH
FUSION GLYCOPROTEIN F0 ; X-RAY DIFFRACTION 2.65Å
e4ccfF2[F:401-466] Image Pymol Jmol Links: PDB, SCOP, CATH
FUSION GLYCOPROTEIN F0 ; X-RAY DIFFRACTION 2.65Å
e4gipD1[D:363-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 ; X-RAY DIFFRACTION 2.000Å
e5yxwB2[B:373-441] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
glycoprotein F1,measles virus fusion protein ; X-RAY DIFFRACTION 2.776Å
e5yzcB2[B:373-441] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
glycoprotein F1,measles virus fusion protein ; X-RAY DIFFRACTION 2.334Å
e5yzdC2[C:373-441] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
glycoprotein F1,measles virus fusion protein ; X-RAY DIFFRACTION 2.636Å
e6mjzA1[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e6mjzB2[B:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e6mjzC2[C:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e5j3dF3[F:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; X-RAY DIFFRACTION 4.077Å
e6cxcB2[B:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0, Envelope glycoprotein chimera ; ELECTRON MICROSCOPY
e6cxcD1[D:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0, Envelope glycoprotein chimera ; ELECTRON MICROSCOPY
e6cxcF2[F:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0, Envelope glycoprotein chimera ; ELECTRON MICROSCOPY
e6tysA1[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e6tysB1[B:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e6tysE1[E:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e6ousF1[F:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain ; X-RAY DIFFRACTION 3.400Å
e6ousB1[B:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain ; X-RAY DIFFRACTION 3.400Å
e6ousD1[D:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain ; X-RAY DIFFRACTION 3.400Å
e6ousH1[H:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain ; X-RAY DIFFRACTION 3.400Å
e6ousJ1[J:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain ; X-RAY DIFFRACTION 3.400Å
e6ousL1[L:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain ; X-RAY DIFFRACTION 3.400Å
e6t3fF2[F:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ligands: NAG ; X-RAY DIFFRACTION 3.2Å
e6w16F2[F:370-430] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0,Envelope glycoprotein fusion ; X-RAY DIFFRACTION 3.1Å
e6xyeB1[B:485-553] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 ; ELECTRON MICROSCOPY
e6xyeD2[D:485-553] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 ; ELECTRON MICROSCOPY
e6xyeF2[F:485-553] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 ; ELECTRON MICROSCOPY
e6w52B1[B:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 fused with Fibritin trimerization domain ; X-RAY DIFFRACTION 3.74Å
e7ki4A1[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e7ki4B1[B:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e7ki4E1[E:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e7ki6A2[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e7ki6B1[B:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e7ki6E1[E:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e7m0iD2[D:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 ; X-RAY DIFFRACTION 2.81Å
e7m0iH2[H:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 ; X-RAY DIFFRACTION 2.81Å
e7m0iL2[L:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 ; X-RAY DIFFRACTION 2.81Å
e7m0iB2[B:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 ; X-RAY DIFFRACTION 2.81Å
e7m0iF1[F:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 ; X-RAY DIFFRACTION 2.81Å
e7m0iJ2[J:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 ; X-RAY DIFFRACTION 2.81Å
e7mmnB2[B:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1,Fibritin ; X-RAY DIFFRACTION 3.57Å
e7mmnI2[I:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1,Fibritin ; X-RAY DIFFRACTION 3.57Å
e7mmnK2[K:401-475] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1,Fibritin ; X-RAY DIFFRACTION 3.57Å
e7sejF2[F:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 subunit ; X-RAY DIFFRACTION 2.5Å
e7sejA2[A:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F1 subunit ; X-RAY DIFFRACTION 2.5Å
e8dg8B2[B:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e8dg8A1[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e8dg8C1[C:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e8fejA1[A:370-429] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion Protein ; ELECTRON MICROSCOPY
e8fejB1[B:370-429] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion Protein ; ELECTRON MICROSCOPY
e8fejC1[C:370-429] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion Protein ; ELECTRON MICROSCOPY
e8felA1[A:370-429] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion Protein ; ELECTRON MICROSCOPY
e8felB1[B:370-429] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion Protein ; ELECTRON MICROSCOPY
e8felC2[C:370-429] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion Protein ; ELECTRON MICROSCOPY
e7uopA1[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7uopD2[D:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7uopG2[G:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7up9A2[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7up9D1[D:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7up9G1[G:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7upaA2[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7upaD2[D:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7upaG1[G:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7upbA1[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7upbD1[D:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7upbG1[G:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7updA2[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7updD1[D:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7updG1[G:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e7upkD2[D:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e7upkA1[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e7upkB1[B:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH
Fusion glycoprotein F0 ; ELECTRON MICROSCOPY
e8e15G1[G:369-443] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
F1 protein with Fibritin peptide ; X-RAY DIFFRACTION 2.41Å
e8fmxA1[A:370-429] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8fmyA1[A:374-433] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8dngA1[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY
e8dnrA1[A:375-434] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fusion glycoprotein F0 ; ligands: NAG ; ELECTRON MICROSCOPY

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