Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
![](/ecod/img/m.gif)
![](/ecod/img/p.gif)
![](/ecod/img/m.gif)
![](/ecod/img/m.gif)
Representatives:
e1twfF1[F:72-155]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
DNA-DIRECTED RNA POLYMERASES I, II, AND III 23 KDA POLYPEPTIDE ; X-RAY DIFFRACTION 2.3Å
e5fywF1[F:72-154] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-DIRECTED RNA POLYMERASES I, II, AND III SUBUNIT RPABC 2 ; ELECTRON MICROSCOPY
e5fz5F1[F:72-154] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-DIRECTED RNA POLYMERASES I, II, AND III SUBUNIT RPABC 2 ; ELECTRON MICROSCOPY
e5m3fF1[F:55-154] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerases I, II, and III subunit RPABC2 ; ELECTRON MICROSCOPY
e5m3mF1[F:57-154] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerases I, II, and III subunit RPABC2 ; ELECTRON MICROSCOPY
e7okxF1[F:50-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7nkxF1[F:69-155] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerases I, II, and III subunit RPABC2 ; ELECTRON MICROSCOPY
e7ok0K1[K:1-86] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit K ; ELECTRON MICROSCOPY
e7okyF1[F:50-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7ol0F1[F:50-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7oq4K1[K:2-86] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit K ; ELECTRON MICROSCOPY
e7oqyK1[K:1-86] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase subunit K ; ELECTRON MICROSCOPY
e7eu0F1[F:59-134] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerases II, IV and V subunit 6A ; ELECTRON MICROSCOPY
e7eu1F1[F:58-134] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerases II, IV and V subunit 6A ; ELECTRON MICROSCOPY
e7fjiF1[F:51-126] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerases I, II, and III subunit RPABC2 ; ELECTRON MICROSCOPY
e7fjjF1[F:51-126] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerases I, II, and III subunit RPABC2 ; ELECTRON MICROSCOPY
e7ob9F1[F:49-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerases I, II, and III subunit RPABC2 ; ELECTRON MICROSCOPY
e7obaF1[F:50-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerases I, II, and III subunit RPABC2 ; ELECTRON MICROSCOPY
e7obbF1[F:50-126] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerases I, II, and III subunit RPABC2 ; ELECTRON MICROSCOPY
e7oo3F1[F:46-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7oobF1[F:46-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7oopF1[F:46-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7opcF1[F:46-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7opdF1[F:46-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7oznF1[F:49-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7oznR1[R:49-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7ozoF1[F:49-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7ozoR1[R:49-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7ozpF1[F:49-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7ozpR1[R:49-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
e7pksF1[F:50-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DNA-directed RNA polymerase II subunit F ; ELECTRON MICROSCOPY
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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