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
Representatives:
e2nqdA1[A:3-110] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chagasin ; ligands: CL,NA ; X-RAY DIFFRACTION 1.740Å
e2h7wB1[B:3-109] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chagasin ; X-RAY DIFFRACTION 1.70Å
e3cbkB1[B:3-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chagasin ; X-RAY DIFFRACTION 2.67Å
e2h7wA1[A:3-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chagasin ; X-RAY DIFFRACTION 1.70Å
e2fo8A1[A:3-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chagasin ; SOLUTION NMR
e3cbjB1[B:3-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chagasin ; ligands: PO4 ; X-RAY DIFFRACTION 1.80Å
e2nnrA1[A:3-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chagasin ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.700Å
e2oulB1[B:4-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chagasin ; X-RAY DIFFRACTION 2.200Å
e2nnrB1[B:3-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Chagasin ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.700Å
e3m86A1[A:-4-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
AMOEBIASIN-2 ; ligands: CL ; X-RAY DIFFRACTION 1.65Å
e3e1zA1[A:2-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CHAGASIN ; ligands: ACY,FMT,ZN ; X-RAY DIFFRACTION 1.86Å
e3m86B1[B:-4-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
AMOEBIASIN-2 ; ligands: 1PE,CL,SO4 ; X-RAY DIFFRACTION 1.65Å
e3m88A1[A:-3-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
AMOEBIASIN-2 ; ligands: CL ; X-RAY DIFFRACTION 1.9Å
e3m88B1[B:-4-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
AMOEBIASIN-2 ; ligands: CL,SO4 ; X-RAY DIFFRACTION 1.9Å
e2wgnB1[B:7-111] Image Pymol Jmol Links: PDB, SCOP, CATH
INHIBITOR OF CYSTEINE PEPTIDASE COMPND 3 ; SOLUTION NMR
e5swkC1[C:2-84] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
De novo protein based on the inhibitor Amoebiasin-1 ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.920Å
e5swkD1[D:1-84] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
De novo protein based on the inhibitor Amoebiasin-1 ; ligands: CL,GOL,SO4 ; X-RAY DIFFRACTION 1.920Å
e6cjzA1[A:1-105] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Amoebiasin-1 ; SOLUTION NMR
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
some similarity with Ig fold
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