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: PH domain-like
H: PH domain-like
T: PH domain-like
F: Unmapped domains
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
Representatives:
e6b3yA1[A:722-946]
nonrep
Image
Pymol
Jmol Links:
PDB,
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CATH, PubMed,
DOI
DENN domain-containing protein 3 ; X-RAY DIFFRACTION 1.85Å
e1zc3B1[B:171-279]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
exocyst complex protein Exo84 ; X-RAY DIFFRACTION 1.95Å
e5xpyA4[A:569-679]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
Fermitin family homolog 2 ; ligands: ACT,GOL ; X-RAY DIFFRACTION 2.0990Å
e3u7dA5[A:634-730]
* nonrep
Image
Pymol
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CATH, PubMed,
DOI
Krev interaction trapped protein 1 ; X-RAY DIFFRACTION 2.49Å
e5xq0B1[B:569-660,B:668-676,B:787-797]
* nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
Fermitin family homolog 2,Integrin beta-1 ; X-RAY DIFFRACTION 2.750Å
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