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
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




Representatives:
e3ahcA1[A:5-385]
* nonrep
Image
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Xylulose 5-phosphate/fructose 6-phosphate phosphoketolase ; ligands: 2PE,EDO,MG,TPP ; X-RAY DIFFRACTION 1.7Å
e8io6B3[B:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io6C2[C:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io6D2[D:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io6E1[E:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io6F2[F:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io6G3[G:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io6H3[H:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io7A2[A:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io7B2[B:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io8B2[B:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9A1[A:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9B1[B:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9C2[C:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9D3[D:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9E1[E:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9F2[F:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9G1[G:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9H2[H:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9I1[I:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9J2[J:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9K3[K:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io9L1[L:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioaA2[A:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioaB3[B:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeA2[A:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeB2[B:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeC2[C:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeD3[D:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeE3[E:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeF2[F:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeG3[G:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeH3[H:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeI1[I:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeJ1[J:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeK1[K:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8ioeL3[L:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e3ahdA1[A:5-385] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
XYLULOSE 5-PHOSPHATE/FRUCTOSE 6-PHOSPHATE PHOSPHOKETOLASE ; ligands: EDO,HTL,MG ; X-RAY DIFFRACTION 1.9Å
e3aheA1[A:5-385] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
XYLULOSE 5-PHOSPHATE/FRUCTOSE 6-PHOSPHATE PHOSPHOKETOLASE ; ligands: 2PE,EDO,MG,THD ; X-RAY DIFFRACTION 2.1Å
e3ahfA1[A:5-385] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
XYLULOSE 5-PHOSPHATE/FRUCTOSE 6-PHOSPHATE PHOSPHOKETOLASE ; ligands: GOL,MG,PO4,TPP ; X-RAY DIFFRACTION 2.3Å
e3ahgA1[A:5-385] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
XYLULOSE 5-PHOSPHATE/FRUCTOSE 6-PHOSPHATE PHOSPHOKETOLASE ; ligands: EDO,HTD,MG ; X-RAY DIFFRACTION 1.9Å
e3ahhA1[A:5-385] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
XYLULOSE 5-PHOSPHATE/FRUCTOSE 6-PHOSPHATE PHOSPHOKETOLASE ; ligands: EDO,HTL,MG,PG4 ; X-RAY DIFFRACTION 2.1Å
e3ahjA1[A:5-385] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
XYLULOSE 5-PHOSPHATE/FRUCTOSE 6-PHOSPHATE PHOSPHOKETOLASE ; ligands: EDO,MG,TPP ; X-RAY DIFFRACTION 2.1Å
e3ai7A1[A:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,TPP ; X-RAY DIFFRACTION 2.200Å
e3ai7B1[B:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,TPP ; X-RAY DIFFRACTION 2.200Å
e3ai7C1[C:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,TPP ; X-RAY DIFFRACTION 2.200Å
e3ai7D1[D:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,TPP ; X-RAY DIFFRACTION 2.200Å
e3ai7E1[E:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,TPP ; X-RAY DIFFRACTION 2.200Å
e3ai7F1[F:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,TPP ; X-RAY DIFFRACTION 2.200Å
e3ai7G1[G:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,TPP ; X-RAY DIFFRACTION 2.200Å
e3ai7H1[H:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,TPP ; X-RAY DIFFRACTION 2.200Å
e6guaA1[A:2-387] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphoketolase ; ligands: MG,PO4,TPP ; SOLUTION SCATTERING 1.95Å
e6guaB1[B:4-387] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphoketolase ; ligands: MG,PO4,TPP ; SOLUTION SCATTERING 1.95Å
e6guaC1[C:3-387] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphoketolase ; ligands: MG,PO4,TPP ; SOLUTION SCATTERING 1.95Å
e6guaD1[D:3-387] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphoketolase ; ligands: MG,PO4,TPP ; SOLUTION SCATTERING 1.95Å
e6guaE1[E:2-387] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphoketolase ; ligands: MG,PO4,TPP ; SOLUTION SCATTERING 1.95Å
e6guaF1[F:3-387] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphoketolase ; ligands: MG,PO4,TPP ; SOLUTION SCATTERING 1.95Å
e6guaG1[G:3-387] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphoketolase ; ligands: MG,PO4,TPP ; SOLUTION SCATTERING 1.95Å
e6guaH1[H:3-387] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable phosphoketolase ; ligands: MG,PO4,TPP ; SOLUTION SCATTERING 1.95Å
e3ahiA1[A:5-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
XYLULOSE 5-PHOSPHATE/FRUCTOSE 6-PHOSPHATE PHOSPHOKETOLASE ; ligands: EDO,HTL,MG ; X-RAY DIFFRACTION 2.1Å
e6lxvA1[A:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphoketolase ; ligands: CA,TPP ; ELECTRON MICROSCOPY
e6lxvB2[B:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphoketolase ; ligands: CA,TPP ; ELECTRON MICROSCOPY
e6lxvC2[C:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphoketolase ; ligands: CA,TPP ; ELECTRON MICROSCOPY
e6lxvD2[D:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphoketolase ; ligands: CA,TPP ; ELECTRON MICROSCOPY
e6lxvE2[E:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphoketolase ; ligands: CA,TPP ; ELECTRON MICROSCOPY
e6lxvF2[F:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphoketolase ; ligands: CA,TPP ; ELECTRON MICROSCOPY
e6lxvG3[G:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphoketolase ; ligands: CA,TPP ; ELECTRON MICROSCOPY
e6lxvH2[H:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Phosphoketolase ; ligands: CA,TPP ; ELECTRON MICROSCOPY
e7c8iB2[B:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,PEP,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8hA2[A:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,LMR,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8hB3[B:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,LMR,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8hC2[C:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,MLA,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8hD1[D:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,MLA,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8hE1[E:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,MLA,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8hF1[F:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,SIN,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8hG1[G:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,SIN,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8hH1[H:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,SIN,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8iA2[A:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,PEP,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8iC1[C:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,PEP,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8iD3[D:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,PEP,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8iE3[E:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,PEP,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8iF3[F:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,PEP,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8iG1[G:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,PEP,TPP ; X-RAY DIFFRACTION 2.50Å
e7c8iH2[H:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Xylulose-5-phosphate/fructose-6-phosphate phosphoketolase ; ligands: CA,PEP,TPP ; X-RAY DIFFRACTION 2.50Å
e8io6A2[A:2-384] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY
e8io8A2[A:9-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG,TPP ; ELECTRON MICROSCOPY

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