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
looks like an elaborated ferredoxin
contains a HTH motif
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
Representatives:
e1gqeA4[A:313-365] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RELEASE FACTOR 2 ; X-RAY DIFFRACTION 1.81Å
e5j4dJA3[JA:291-358] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.1Å
e5j4dOC3[OC:291-358] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.1Å
e2b64Y3[Y:288-354] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e3mr8V12[V:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e3d5cX8[X:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
; ligands: MG
e3ms0V8[V:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e1zbtA2[A:298-358] Image Pymol Jmol Links: PDB, SCOP, CATH
Peptide chain release factor 1 ; X-RAY DIFFRACTION 2.34Å
e3d5aX8[X:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
; ligands: MG
e1mi6A4[A:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
peptide chain release factor RF-2 ; ELECTRON MICROSCOPY
e1ml5Z4[Z:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 2 ; ELECTRON MICROSCOPY
e4v4rAY4[AY:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; X-RAY DIFFRACTION 5.9Å
e4v63AX4[AX:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.2Å
e4v63CX4[CX:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; ligands: MG ; X-RAY DIFFRACTION 3.2Å
e4v7pAV4[AV:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.514Å
e4v7pDV4[DV:289-354] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.514Å
e5j30QY3[QY:291-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.200Å
e5j30XY1[XY:291-352] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.200Å
e5j3cQY3[QY:291-355] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.040Å
e5j3cXY1[XY:291-356] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 1 ; X-RAY DIFFRACTION 3.040Å
e5czpQY4[QY:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 2 ; ligands: MG ; X-RAY DIFFRACTION 3.300Å
e5czpXY4[XY:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 2 ; X-RAY DIFFRACTION 3.300Å
e5dfeQY2[QY:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 2 ; X-RAY DIFFRACTION 3.09997551079Å
e5dfeXY2[XY:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 2 ; X-RAY DIFFRACTION 3.09997551079Å
e5mdv72[7:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 2 ; ELECTRON MICROSCOPY
e5mdw72[7:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 2 ; ELECTRON MICROSCOPY
e5mgpz3[z:313-364] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 2 ; ELECTRON MICROSCOPY
e5u4iv1[v:313-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 2 ; ELECTRON MICROSCOPY
e5h5u41[4:313-365] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor 2 ; ELECTRON MICROSCOPY
e5u9fZ3[Z:313-364] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor RF2 ; ELECTRON MICROSCOPY
e5u9gZ4[Z:313-364] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor RF2 ; ELECTRON MICROSCOPY
e5o2rv1[v:291-351] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Peptide chain release factor RF1 ; ELECTRON MICROSCOPY
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