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
Representatives:
e3faaA1[A:171-500] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-beta receptor type-1 ; ligands: 55F,PO4 ; X-RAY DIFFRACTION 3.20Å
e3h9rA1[A:172-499] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ACTIVIN RECEPTOR TYPE-1 ; ligands: PG4,SO4,TAK ; X-RAY DIFFRACTION 2.35Å
e2x7oA1[A:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-BETA RECEPTOR TYPE I ; ligands: ZOP ; X-RAY DIFFRACTION 3.70Å
e3faaB1[B:171-501] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-beta receptor type-1 ; ligands: 55F,PO4 ; X-RAY DIFFRACTION 3.20Å
e3faaC1[C:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-beta receptor type-1 ; ligands: 55F,PO4 ; X-RAY DIFFRACTION 3.20Å
e3faaD1[D:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-beta receptor type-1 ; ligands: 55F,PO4 ; X-RAY DIFFRACTION 3.20Å
e3faaE1[E:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-beta receptor type-1 ; ligands: 55F,PO4 ; X-RAY DIFFRACTION 3.20Å
e3kcfA1[A:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-beta receptor type-1 ; ligands: JZO,PO4 ; X-RAY DIFFRACTION 2.8Å
e3kcfB1[B:171-501] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-beta receptor type-1 ; ligands: JZO,PO4 ; X-RAY DIFFRACTION 2.8Å
e3kcfC1[C:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-beta receptor type-1 ; ligands: JZO,PO4 ; X-RAY DIFFRACTION 2.8Å
e3kcfD1[D:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-beta receptor type-1 ; ligands: JZO,PO4 ; X-RAY DIFFRACTION 2.8Å
e3kcfE1[E:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-beta receptor type-1 ; ligands: JZO,PO4 ; X-RAY DIFFRACTION 2.8Å
e2x7oB1[B:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-BETA RECEPTOR TYPE I ; ligands: ZOP ; X-RAY DIFFRACTION 3.70Å
e2x7oC1[C:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-BETA RECEPTOR TYPE I ; ligands: ZOP ; X-RAY DIFFRACTION 3.70Å
e2x7oD1[D:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-BETA RECEPTOR TYPE I ; ligands: ZOP ; X-RAY DIFFRACTION 3.70Å
e2x7oE1[E:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-BETA RECEPTOR TYPE I ; ligands: ZOP ; X-RAY DIFFRACTION 3.70Å
e4c02A1[A:178-499] Image Pymol Jmol Links: PDB, SCOP, CATH
ACTIVIN RECEPTOR TYPE-1 ; ligands: EDO,FLC,TAK ; X-RAY DIFFRACTION 2.17Å
e1iasA1[A:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-BETA RECEPTOR TYPE I ; ligands: SO4 ; X-RAY DIFFRACTION 2.9Å
e1iasB1[B:171-501] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-BETA RECEPTOR TYPE I ; ligands: SO4 ; X-RAY DIFFRACTION 2.9Å
e1iasC1[C:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-BETA RECEPTOR TYPE I ; ligands: SO4 ; X-RAY DIFFRACTION 2.9Å
e1iasD1[D:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-BETA RECEPTOR TYPE I ; ligands: SO4 ; X-RAY DIFFRACTION 2.9Å
e1iasE1[E:171-500] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TGF-BETA RECEPTOR TYPE I ; ligands: SO4 ; X-RAY DIFFRACTION 2.9Å
e6eixA1[A:192-503] Image Pymol Jmol Links: PDB, SCOP, CATH
Activin receptor type-1 ; ligands: A3F,EDO ; X-RAY DIFFRACTION 2.30Å
e6i1sA1[A:170-499] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Activin receptor type-1 ; ligands: E26,EDO,SO4 ; X-RAY DIFFRACTION 1.52Å
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