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
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
Representatives:
e1lc0A2[A:2-128,A:247-291] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Biliverdin Reductase A ; ligands: PO4 ; X-RAY DIFFRACTION 1.20Å
e3o9zA1[A:1-132,A:262-310] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Lipopolysaccharide biosynthesis protein wbpB ; ligands: AKG,CL,NAD ; X-RAY DIFFRACTION 1.449Å
e5kvqB1[B:4-127,B:284-358] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Irp3 protein ; ligands: EDO,NAP ; X-RAY DIFFRACTION 1.45Å
e2nvwA2[A:2-154,A:374-457] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
GALACTOSE/LACTOSE METABOLISM REGULATORY PROTEIN GAL80 ; X-RAY DIFFRACTION 2.1Å
e2ixbA1[A:19-153,A:373-444] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ALPHA-N-ACETYLGALACTOSAMINIDASE ; ligands: A2G,MPD,MRD,NAD ; X-RAY DIFFRACTION 2.400Å
e1ydwA2[A:6-133,A:305-360] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
AX110P-like protein ; X-RAY DIFFRACTION 2.488Å
e1zh8A2[A:4-131,A:276-328] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
OXIDOREDUCTASE ; ligands: EDO,NAP ; X-RAY DIFFRACTION 2.5Å
e3moiA1[A:1-125,A:335-387] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
Probable dehydrogenase ; X-RAY DIFFRACTION 2.5Å
e1xeaA2[A:2-122,A:267-312] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, Gfo/Idh/MocA family ; X-RAY DIFFRACTION 2.65Å
e1tltA2[A:5-127,A:268-308] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
PUTATIVE OXIDOREDUCTASE (VIRULENCE FACTOR mviM HOMOLOG) ; ligands: SO4 ; X-RAY DIFFRACTION 2.7Å
e3e9mA1[A:1-127,A:274-321] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, Gfo/Idh/MocA family ; X-RAY DIFFRACTION 2.7Å
e3e9mC2[C:2-127,C:274-319] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, Gfo/Idh/MocA family ; X-RAY DIFFRACTION 2.7Å
e3e9mB2[B:2-127,B:274-319] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, Gfo/Idh/MocA family ; X-RAY DIFFRACTION 2.7Å
e3e9mD2[D:2-127,D:274-320] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, Gfo/Idh/MocA family ; X-RAY DIFFRACTION 2.7Å
e3ip3A2[A:1-130,A:286-328] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, putative ; X-RAY DIFFRACTION 2.14Å
e3ip3B2[B:1-130,B:286-331] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, putative ; ligands: SO4 ; X-RAY DIFFRACTION 2.14Å
e3ip3C2[C:1-130,C:286-330] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, putative ; X-RAY DIFFRACTION 2.14Å
e3ip3D1[D:1-130,D:286-328] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, putative ; X-RAY DIFFRACTION 2.14Å
e3ip3E2[E:1-130,E:286-328] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, putative ; X-RAY DIFFRACTION 2.14Å
e3ip3F2[F:1-130,F:286-330] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, putative ; ligands: SO4 ; X-RAY DIFFRACTION 2.14Å
e3ip3G2[G:2-130,G:286-328] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, putative ; X-RAY DIFFRACTION 2.14Å
e3ip3H2[H:2-130,H:286-330] Image Pymol Jmol Links: PDB, SCOP, CATH
Oxidoreductase, putative ; X-RAY DIFFRACTION 2.14Å
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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