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:
e2ajtA2[A:1-175] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
L-arabinose isomerase ; X-RAY DIFFRACTION 2.6Å
e2ajtB2[B:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
L-arabinose isomerase ; X-RAY DIFFRACTION 2.6Å
e2ajtC2[C:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
L-arabinose isomerase ; X-RAY DIFFRACTION 2.6Å
e4f2dA2[A:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: RB0 ; X-RAY DIFFRACTION 2.3Å
e4f2dB2[B:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: RB0 ; X-RAY DIFFRACTION 2.3Å
e4f2dC2[C:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: RB0 ; X-RAY DIFFRACTION 2.3Å
e2hxgA2[A:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.8Å
e2hxgB2[B:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.8Å
e2hxgC2[C:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.8Å
e4lqlA3[A:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-ARABINOSE ISOMERASE ; X-RAY DIFFRACTION 3.23Å
e4lqlB3[B:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-ARABINOSE ISOMERASE ; X-RAY DIFFRACTION 3.23Å
e4lqlC2[C:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-ARABINOSE ISOMERASE ; X-RAY DIFFRACTION 3.23Å
e4lqlD3[D:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-ARABINOSE ISOMERASE ; X-RAY DIFFRACTION 3.23Å
e4lqlE2[E:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-ARABINOSE ISOMERASE ; X-RAY DIFFRACTION 3.23Å
e4lqlF3[F:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-ARABINOSE ISOMERASE ; X-RAY DIFFRACTION 3.23Å
e4r1oA2[A:2-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.4Å
e4r1oB3[B:2-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.4Å
e4r1oC3[C:2-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.4Å
e4r1oD2[D:2-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.4Å
e4r1oE3[E:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.4Å
e4r1oF3[F:4-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.4Å
e4r1pA3[A:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.297Å
e4r1pB2[B:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.297Å
e4r1pC2[C:2-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.297Å
e4r1pD2[D:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.297Å
e4r1pE3[E:2-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.297Å
e4r1pF3[F:5-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.297Å
e4r1qA3[A:2-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: SST ; X-RAY DIFFRACTION 2.248Å
e4r1qB3[B:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: SST ; X-RAY DIFFRACTION 2.248Å
e4r1qC2[C:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: SST ; X-RAY DIFFRACTION 2.248Å
e4r1qD3[D:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: SST ; X-RAY DIFFRACTION 2.248Å
e4r1qE2[E:2-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: SST ; X-RAY DIFFRACTION 2.248Å
e4r1qF2[F:2-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: SST ; X-RAY DIFFRACTION 2.248Å
e7cwvA1[A:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: GOL,MN ; X-RAY DIFFRACTION 3.530Å
e7cx7A1[A:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: MPD ; X-RAY DIFFRACTION 2.49Å
e7cxoB1[B:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.20Å
e7cyyA1[A:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: MPD,RB0 ; X-RAY DIFFRACTION 2.5800Å
e7cwvB1[B:2-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cwvC1[C:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cwvD1[D:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cwvE1[E:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cwvF1[F:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cwvG1[G:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cwvH1[H:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cwvI1[I:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cwvJ1[J:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cwvK1[K:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cwvL1[L:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.530Å
e7cx7B1[B:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: MPD ; X-RAY DIFFRACTION 2.49Å
e7cx7C1[C:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: MPD ; X-RAY DIFFRACTION 2.49Å
e7cx7D1[D:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.49Å
e7cx7E1[E:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: MPD ; X-RAY DIFFRACTION 2.49Å
e7cx7F1[F:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: MPD ; X-RAY DIFFRACTION 2.49Å
e7cxoA1[A:3-174] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.20Å
e7cxoC1[C:2-174] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.20Å
e7cxoD1[D:3-174] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.20Å
e7cxoE1[E:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.20Å
e7cxoF1[F:2-174] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.20Å
e7cyyB1[B:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: RB0 ; X-RAY DIFFRACTION 2.5800Å
e7cyyC1[C:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: MPD ; X-RAY DIFFRACTION 2.5800Å
e7cyyD1[D:2-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: RB0 ; X-RAY DIFFRACTION 2.5800Å
e7cyyE1[E:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 2.5800Å
e7cyyF1[F:3-176] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: RB0 ; X-RAY DIFFRACTION 2.5800Å
e7ch3A1[A:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3B1[B:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3C1[C:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3D1[D:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3E1[E:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3F1[F:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3G1[G:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3H1[H:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3I1[I:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3J1[J:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3K1[K:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; X-RAY DIFFRACTION 3.600Å
e7ch3L1[L:1-175] Image Pymol Jmol Links: PDB, SCOP, CATH
L-arabinose isomerase ; ligands: MN ; X-RAY DIFFRACTION 3.600Å
e7chlA1[A:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlB1[B:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlC1[C:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlD1[D:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlE1[E:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlF1[F:2-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlG1[G:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlH1[H:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlI1[I:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlJ1[J:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlK1[K:1-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
e7chlL1[L:2-174] Image Pymol Jmol Links: PDB, SCOP, CATH
Hybrid Arabinose isomerase ; X-RAY DIFFRACTION 3.400Å
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