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:
e1vi6A1[A:5-197] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
30S ribosomal protein S2P ; ligands: NA ; X-RAY DIFFRACTION 1.85Å
e7syqB1[B:2-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
uS2 (SA) ; ELECTRON MICROSCOPY
e7syrB1[B:2-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
uS2 (SA) ; ELECTRON MICROSCOPY
e7sysB1[B:2-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
uS2 (SA) ; ELECTRON MICROSCOPY
e7sytB1[B:2-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7syuB1[B:2-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7syvB1[B:2-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7sywB1[B:2-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7pzyB1[B:2-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0 ; ELECTRON MICROSCOPY
e7q08B1[B:2-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0 ; ELECTRON MICROSCOPY
e7q0fB1[B:2-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0 ; ELECTRON MICROSCOPY
e7q0pB1[B:2-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0 ; ELECTRON MICROSCOPY
e7q0rB1[B:2-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0 ; ELECTRON MICROSCOPY
e7zw0sP1[sP:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e7qvpRA1[RA:3-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7qvpSA1[SA:3-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7qcaSA01[SA0:2-222] Image Pymol Jmol Links: PDB, SCOP, CATH
40S ribosomal protein S0 ; ELECTRON MICROSCOPY
e7qggSA1[SA:3-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7qjhSA01[SA0:2-222] Image Pymol Jmol Links: PDB, SCOP, CATH
e7qjhRA01[RA0:2-222] Image Pymol Jmol Links: PDB, SCOP, CATH
e7r4xA1[A:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7wtvA1[A:2-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7wtwA1[A:2-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7wtxA1[A:2-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7wtzA1[A:2-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e7wu0A1[A:2-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e8c01P1[P:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e7zpqAA1[AA:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e7zrsAA1[AA:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e7zuwAA1[AA:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e7zuxDA1[DA:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e8br8SA1[SA:15-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e8brmSA1[SA:15-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein SA ; ELECTRON MICROSCOPY
e8bsiSA1[SA:14-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e8bsjSA1[SA:16-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e8btdSA1[SA:14-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein SA ; ELECTRON MICROSCOPY
e8btrSA1[SA:14-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein SA ; ELECTRON MICROSCOPY
e8bqdP1[P:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e8bqxP1[P:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e8c83P1[P:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e8cahP1[P:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e8casP1[P:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e8cbjA1[A:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e8br3SA01[SA0:2-222] Image Pymol Jmol Links: PDB, SCOP, CATH
e7z3nSA1[SA:3-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0 ; ELECTRON MICROSCOPY
e7z3oSA1[SA:3-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0 ; ELECTRON MICROSCOPY
e8auvZ1[Z:5-206] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
uS2 (40S ribosomal protein SA) ; ELECTRON MICROSCOPY
e8b2lZ11[Z1:5-206] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e8eubBA1[BA:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8ccsd1[d:2-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S0-A ; ELECTRON MICROSCOPY
e8bhfB31[B3:2-218] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8p5dSA01[SA0:2-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8t4sA1[A:2-214] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8ppkA1[A:2-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e8hkxAS2P1[AS2P:28-223] Image Pymol Jmol Links: PDB, SCOP, CATH
; ELECTRON MICROSCOPY
e8hkyAS2P1[AS2P:28-223] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: UNK ; ELECTRON MICROSCOPY
e8hl2AS2P1[AS2P:28-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
30S ribosomal protein S2 ; ligands: UNK ; ELECTRON MICROSCOPY
e8hl5AS2P1[AS2P:28-223] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: UNK ; ELECTRON MICROSCOPY
e8a98SB1[SB:1-211] Image Pymol Jmol Links: PDB, SCOP, CATH
40S ribosomal protein SA ; ELECTRON MICROSCOPY
e8q5iB1[B:2-209] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
; ELECTRON MICROSCOPY
Previouse4z8c1b1[1b:7-237] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
30S ribosomal protein S2 ; ligands: MG ; X-RAY DIFFRACTION 2.800Å
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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