Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
![](/ecod/img/m.gif)
![](/ecod/img/m.gif)
![](/ecod/img/m.gif)
![](/ecod/img/m.gif)
Representatives:
e1go3F1[F:1-107]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
DNA-DIRECTED RNA POLYMERASE SUBUNIT F ; X-RAY DIFFRACTION 1.750Å
e2c35A1[A:14-142]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
DNA-DIRECTED RNA POLYMERASE II 16 KDA POLYPEPTIDE ; X-RAY DIFFRACTION 2.700Å
e7okxD1[D:60-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RNA polymerase II subunit D ; ELECTRON MICROSCOPY
e7nkxD1[D:1-69,D:132-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit RPB4 ; ELECTRON MICROSCOPY
e7okyD1[D:60-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RNA polymerase II subunit D ; ELECTRON MICROSCOPY
e7ol0D1[D:60-180] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RNA polymerase II subunit D ; ELECTRON MICROSCOPY
e7oo3D1[D:14-139] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPOL4c domain-containing protein ; ELECTRON MICROSCOPY
e7oobD1[D:14-139] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPOL4c domain-containing protein ; ELECTRON MICROSCOPY
e7oopD1[D:14-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPOL4c domain-containing protein ; ELECTRON MICROSCOPY
e7opcD1[D:14-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPOL4c domain-containing protein ; ELECTRON MICROSCOPY
e7opdD1[D:14-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPOL4c domain-containing protein ; ELECTRON MICROSCOPY
e7oznD1[D:14-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RNA polymerase II subunit D ; ELECTRON MICROSCOPY
e7oznP1[P:14-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RNA polymerase II subunit D ; ELECTRON MICROSCOPY
e7ozoD1[D:14-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RNA polymerase II subunit D ; ELECTRON MICROSCOPY
e7ozoP1[P:14-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RNA polymerase II subunit D ; ELECTRON MICROSCOPY
e7ozpD1[D:14-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RNA polymerase II subunit D ; ELECTRON MICROSCOPY
e7ozpP1[P:14-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RNA polymerase II subunit D ; ELECTRON MICROSCOPY
e7pksD1[D:14-139] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RNA polymerase II subunit D ; ELECTRON MICROSCOPY
![](/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.
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
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