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
Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365
Representatives:
e2fgqX1[X:3-332] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Outer membrane porin protein 32 ; ligands: BOG,CA,MLT,SO4 ; X-RAY DIFFRACTION 1.45Å
e2fgrA1[A:3-332] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Outer membrane porin protein 32 ; ligands: CA,SO4 ; X-RAY DIFFRACTION 1.5Å
e1e54A1[A:3-332] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OUTER MEMBRANE PORIN PROTEIN 32 ; ligands: CA,SO4 ; X-RAY DIFFRACTION 2.100Å
e6ehbA1[A:1-320] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Outer membrane protein U ; ligands: C8E ; X-RAY DIFFRACTION 1.55Å
e6ehbB1[B:1-320] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Outer membrane protein U ; ligands: C8E ; X-RAY DIFFRACTION 1.55Å
e6ehbC1[C:1-320] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Outer membrane protein U ; ligands: C8E ; X-RAY DIFFRACTION 1.55Å
e6ehcA1[A:12-320] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Outer membrane protein U ; ligands: C8E ; X-RAY DIFFRACTION 2.02Å
e6ehcB1[B:12-320] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Outer membrane protein U ; ligands: C8E ; X-RAY DIFFRACTION 2.02Å
e5onuA1[A:32-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Outer membrane protein OmpU ; ligands: C8E,GOL,LDA ; X-RAY DIFFRACTION 2.22Å
e5mdqA1[A:1-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: NA ; X-RAY DIFFRACTION 2.50Å
e5onuB1[B:32-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Outer membrane protein OmpU ; ligands: C8E,GOL,LDA ; X-RAY DIFFRACTION 2.22Å
e5onuC1[C:32-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Outer membrane protein OmpU ; ligands: C8E,GOL,LDA ; X-RAY DIFFRACTION 2.22Å
e5mdoA1[A:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 1.95Å
e5mdoB1[B:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 1.95Å
e5mdoC1[C:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 1.95Å
e5mdoD1[D:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 1.95Å
e5mdoE1[E:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 1.95Å
e5mdoF1[F:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 1.95Å
e5mdpA1[A:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; X-RAY DIFFRACTION 3.08Å
e5mdpB1[B:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; X-RAY DIFFRACTION 3.08Å
e5mdpC1[C:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; X-RAY DIFFRACTION 3.08Å
e5mdqB1[B:1-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: NA ; X-RAY DIFFRACTION 2.50Å
e5mdqC1[C:1-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: NA ; X-RAY DIFFRACTION 2.50Å
e5mdrA1[A:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 1.90Å
e5mdrB1[B:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 1.90Å
e5mdrC1[C:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 1.90Å
e5mdrD1[D:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 1.90Å
e5mdrE1[E:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 1.90Å
e5mdrF1[F:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 1.90Å
e5mdsA1[A:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: NAG ; X-RAY DIFFRACTION 2.60Å
e5mdsB1[B:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: NAG ; X-RAY DIFFRACTION 2.60Å
e5mdsC1[C:10-350] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chitoporin ; ligands: NAG ; X-RAY DIFFRACTION 2.60Å
e7eqmA1[A:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,MG,NA ; X-RAY DIFFRACTION 2.500Å
e7eqmB1[B:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: MG,NA ; X-RAY DIFFRACTION 2.500Å
e7eqmC1[C:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,MG,NA ; X-RAY DIFFRACTION 2.500Å
e7eqrA1[A:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 2.700Å
e7eqrB1[B:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 2.700Å
e7eqrC1[C:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 2.700Å
e7eqrD1[D:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 2.700Å
e7eqrE1[E:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 2.700Å
e7eqrF1[F:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA,NAG ; X-RAY DIFFRACTION 2.700Å
e7x5pA1[A:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,DXT,NA ; X-RAY DIFFRACTION 3.4Å
e7x5pB1[B:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,DXT,NA ; X-RAY DIFFRACTION 3.4Å
e7x5pC1[C:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 3.4Å
e7x5pD1[D:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,DXT,NA ; X-RAY DIFFRACTION 3.4Å
e7x5pE1[E:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 3.4Å
e7x5pF1[F:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,DXT,NA ; X-RAY DIFFRACTION 3.4Å
e7x5qA1[A:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 2.7Å
e7x5qB1[B:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 2.7Å
e7x5qC1[C:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 2.7Å
e7x5qD1[D:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 2.7Å
e7x5qE1[E:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: NA ; X-RAY DIFFRACTION 2.7Å
e7x5qF1[F:20-350] Image Pymol Jmol Links: PDB, SCOP, CATH
Chitoporin ; ligands: C8E,NA ; X-RAY DIFFRACTION 2.7Å
e6ehdA1[A:1-325] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OmpT protein ; ligands: C8E,MES ; X-RAY DIFFRACTION 1.66Å
e6eheA1[A:7-310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OmpT protein ; ligands: ACT,C8E,MG ; X-RAY DIFFRACTION 2.31Å
e6ehfA1[A:7-325] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OmpT protein ; ligands: CA ; X-RAY DIFFRACTION 2.72Å
e5oykA1[A:2-325] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Gram-negative porin family protein ; X-RAY DIFFRACTION 3.2Å
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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