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
![](/ecod/img/m.gif)
![](/ecod/img/m.gif)
![](/ecod/img/p.gif)
![](/ecod/img/m.gif)
Representatives:
e1twfA11[A:872-1059]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
DNA-DIRECTED RNA POLYMERASE II LARGEST SUBUNIT ; X-RAY DIFFRACTION 2.3Å
e7egbo2[o:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7nvrA3[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7nvsA6[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPB1 ; ELECTRON MICROSCOPY
e7nvtA3[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPB1 ; ELECTRON MICROSCOPY
e7nvuA9[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPB1 ; ELECTRON MICROSCOPY
e7nvyA9[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPB1 ; ELECTRON MICROSCOPY
e7nvzA9[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPB1 ; ELECTRON MICROSCOPY
e7nw0A7[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPB1 ; ELECTRON MICROSCOPY
e6xreA9[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7kedA7[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; X-RAY DIFFRACTION 3.550Å
e7o4iA9[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7egco9[o:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7b7uA2[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7nkyA7[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7keeA6[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; X-RAY DIFFRACTION 3.410Å
e7kefA1[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; X-RAY DIFFRACTION 3.890Å
e7o4jA4[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7o72A5[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7o73A3[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7o75A8[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7f4gA4[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPB1 ; ELECTRON MICROSCOPY
e7okxA5[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7nkxA5[A:872-1060] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e6gmhA5[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPB1 ; ELECTRON MICROSCOPY
e7okyA5[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7ol0A5[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7oznA4[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPB1 ; ELECTRON MICROSCOPY
e7oznM4[M:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPB1 ; ELECTRON MICROSCOPY
e7ozoA4[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7ozoM4[M:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7ozpA4[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7ozpM4[M:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7pksA5[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7rimA6[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; X-RAY DIFFRACTION 2.9Å
e7oobA1[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7ml0A5[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7ml1A7[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7ml2A5[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7ml4A4[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7ripA8[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; X-RAY DIFFRACTION 3.270Å
e7riqA3[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; X-RAY DIFFRACTION 2.960Å
e7riwA8[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; X-RAY DIFFRACTION 3.17Å
e7rixA7[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; X-RAY DIFFRACTION 3.3Å
e7riyA1[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; X-RAY DIFFRACTION 3.630Å
e7oo3A1[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7oopA7[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7opcA4[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7opdA9[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7meia9[a:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7meiA8[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7mk9A9[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7mkaa8[a:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7xn7A3[A:873-1061] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7xseA1[A:873-1061] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7xsxA9[A:873-1061] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7xszA2[A:873-1061] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7xtdA9[A:873-1061] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7xt7A2[A:873-1061] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7xtiA2[A:873-1061] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7ui9A9[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7uifA3[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7uioAA8[AA:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7uioBA7[BA:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7zs9A4[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7zsaA3[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7zsbA8[A:872-1059] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1 ; ELECTRON MICROSCOPY
e7zwdA9[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7zx7A9[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7zx8A2[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e8h0vA8[A:873-1061] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e8h0wA3[A:873-1061] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e8bvwA6[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e8byqA4[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e8bz1A1[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit ; ELECTRON MICROSCOPY
e7ycx19[1:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB1,DNA-directed RNA polymerase II subunit RPB1, CTD1, CTD2, CTD3, CTD4 ; ELECTRON MICROSCOPY
e8p4fA2[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8a40A5[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8b3dA3[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH
; ELECTRON MICROSCOPY
e8oeuA4[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8p4aA8[A:895-1082] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e7wbvA7[A:873-1061] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
Previous![](/ecod/img/p.gif)
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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