Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
alpha bundlesalpha-helix bundles with mainly parallel helices
Representatives:
e1jr8A1[A:7-111] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
ERV2 PROTEIN, MITOCHONDRIAL ; ligands: FAD ; X-RAY DIFFRACTION 1.5Å
e1oqcA1[A:13-124] nonrep Image Pymol Jmol Links: PDB, SCOP, CATHDOI
AUGMENTER OF LIVER REGENERATION ; ligands: FAD ; X-RAY DIFFRACTION 1.8Å
e3td7A1[A:32-174] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
FAD-linked sulfhydryl oxidase R596 ; ligands: FAD ; X-RAY DIFFRACTION 2.21Å
e3qcpA3[A:304-446] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
QSOX FROM TRYPANOSOMA BRUCEI (TBQSOX) ; ligands: FAD ; X-RAY DIFFRACTION 2.3Å
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
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