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
a+b three layersone mainly antiparallel beta-sheet layer sandwiched between two alpha-helix layers
Representatives:
e3bqwA1[A:5-351] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
Putative capsid protein of prophage ; X-RAY DIFFRACTION 2.2Å
e8k3901[0:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k3911[1:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k3921[2:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k3931[3:5-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k3941[4:5-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k3951[5:5-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k3961[6:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k3971[7:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39A1[A:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39B1[B:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39C1[C:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39D1[D:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39E1[E:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39F1[F:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39G1[G:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39H1[H:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39I1[I:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39J1[J:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39K1[K:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39L1[L:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39M1[M:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39N1[N:5-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39O1[O:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39P1[P:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39Q1[Q:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39R1[R:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39S1[S:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39T1[T:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39g1[g:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8k39h1[h:5-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e6i9eA1[A:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6i9eB1[B:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6i9eC1[C:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6i9eD1[D:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6i9eE1[E:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6i9eF1[F:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6i9eG1[G:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6ibcA1[A:24-397] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6ibcG1[G:23-83,G:104-394] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6ibcB1[B:24-397] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6ibcC1[C:24-397] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6ibcD1[D:24-397] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6ibcE1[E:24-397] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6ibcF1[F:24-396] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6o3hA1[A:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6o3hB1[B:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6o3hC1[C:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6o3hD1[D:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6o3hE1[E:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6o3hF1[F:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6o3hG1[G:1-409] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major head protein ; ELECTRON MICROSCOPY
e6xgpA1[A:4-357] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
YSD1_17 major capsid protein ; X-RAY DIFFRACTION 2.6Å
e6xgpB1[B:4-357] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
YSD1_17 major capsid protein ; X-RAY DIFFRACTION 2.6Å
e6xgqA1[A:2-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
YSD1_17 ; ELECTRON MICROSCOPY
e6xgqB1[B:2-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
YSD1_17 ; ELECTRON MICROSCOPY
e6xgqC1[C:2-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
YSD1_17 ; ELECTRON MICROSCOPY
e6xgqD1[D:2-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
YSD1_17 ; ELECTRON MICROSCOPY
e6xgqE1[E:2-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
YSD1_17 ; ELECTRON MICROSCOPY
e6xgqF1[F:2-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
YSD1_17 ; ELECTRON MICROSCOPY
e6xgqG1[G:4-217,G:237-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
YSD1_17 ; ELECTRON MICROSCOPY
e7vi9A1[A:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vi9B1[B:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vi9C1[C:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vi9D1[D:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vi9E1[E:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vi9F1[F:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vi9G1[G:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viaA1[A:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viaB1[B:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viaC1[C:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viaD1[D:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viaE1[E:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viaF1[F:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viaG1[G:7-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viiA1[A:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viiB1[B:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viiC1[C:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viiD1[D:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viiE1[E:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viiF1[F:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7viiG1[G:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vikA1[A:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vikB1[B:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vikC1[C:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vikD1[D:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vikE1[E:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vikF1[F:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7vikG1[G:3-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; ELECTRON MICROSCOPY
e7sj5A1[A:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; X-RAY DIFFRACTION 2.695Å
e7sj5B1[B:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; X-RAY DIFFRACTION 2.695Å
e7sj5C1[C:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; X-RAY DIFFRACTION 2.695Å
e7sj5D1[D:2-341] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Major capsid protein ; X-RAY DIFFRACTION 2.695Å
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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