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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative


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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

X: cradle loop barrel

Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365

X: WWE domain
H: WWE domain
T: WWE domain
F: WWE

PF02825

Representatives:

e2a90A1[A:43-131] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DELTEX PROTEIN ; X-RAY DIFFRACTION 2.15Å

e3v3lA1[A:101-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

E3 UBIQUITIN-PROTEIN LIGASE RNF146 ; ligands: V3L ; X-RAY DIFFRACTION 1.65Å

e2dk6A1[A:1-102] Image Pymol Jmol Links: PDB, SCOP, CATH

PARP11 protein ; SOLUTION NMR

e3v3lB1[B:99-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

E3 UBIQUITIN-PROTEIN LIGASE RNF146 ; ligands: V3L ; X-RAY DIFFRACTION 1.65Å

e2rsfA1[A:1-110] Image Pymol Jmol Links: PDB, SCOP, CATH

E3 UBIQUITIN-PROTEIN LIGASE RNF146 ; ligands: ATP ; SOLUTION NMR

e4qplA1[A:81-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

E3 ubiquitin-protein ligase RNF146 ; ligands: V3L ; X-RAY DIFFRACTION 1.900Å

e4qplC1[C:81-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

E3 ubiquitin-protein ligase RNF146 ; ligands: V3L ; X-RAY DIFFRACTION 1.900Å

e6pflB1[B:1613-1690] Image Pymol Jmol Links: PDB, SCOP, CATH

E3 ubiquitin-protein ligase HUWE1 ; ligands: APR,UNX ; X-RAY DIFFRACTION 2.100Å

e6pflA1[A:1613-1688] Image Pymol Jmol Links: PDB, SCOP, CATH

E3 ubiquitin-protein ligase HUWE1 ; ligands: APR,UNX ; X-RAY DIFFRACTION 2.100Å

e7uw7A1[A:766-837] Image Pymol Jmol Links: PDB, SCOP, CATH

Isoform 2 of E3 ubiquitin-protein ligase TRIP12 ; ligands: ADP,UNX ; X-RAY DIFFRACTION 1.170Å

e2a90A2[A:132-211] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DELTEX PROTEIN ; X-RAY DIFFRACTION 2.15Å

e1ujrA1[A:1-110] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

hypothetical protein AK012080 ; SOLUTION NMR

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