Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
Representatives:
e2v7fA1[A:2-150] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RPS19E SSU RIBOSOMAL PROTEIN S19E ; ligands: CL ; X-RAY DIFFRACTION 1.15Å
e7nwgU21[U2:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
S19 ; ligands: MG ; ELECTRON MICROSCOPY
e7nwhTT1[TT:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ligands: MG ; ELECTRON MICROSCOPY
e6xu6AT1[AT:6-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19a ; ELECTRON MICROSCOPY
e6xu8AT1[AT:6-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19a ; ELECTRON MICROSCOPY
e7mdzTT1[TT:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7mqaNP1[NP:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e6xu7AT1[AT:6-148] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19a ; ELECTRON MICROSCOPY
e7d4iSU1[SU:4-141] Image Pymol Jmol Links: PDB, SCOP, CATH
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e7d63SU1[SU:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e7ls1B31[B3:4-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7ls2B31[B3:4-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7osaeS191[eS19:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ligands: MG ; X-RAY DIFFRACTION 3.0Å
e7osmeS191[eS19:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ligands: MG ; X-RAY DIFFRACTION 3.0Å
e7r81U21[U2:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7rr5ST1[ST:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ligands: ASP,MG ; ELECTRON MICROSCOPY
e7olcST1[ST:3-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-like protein ; ELECTRON MICROSCOPY
e7cpuST1[ST:3-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MG ; ELECTRON MICROSCOPY
e7oldST1[ST:3-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-like protein ; ELECTRON MICROSCOPY
e7cpvST1[ST:3-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MG ; ELECTRON MICROSCOPY
e7qepC91[C9:1-135] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7zagU1[U:2-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
30S ribosomal protein S19e ; ligands: MET,MG ; ELECTRON MICROSCOPY
e7zahU1[U:2-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
30S ribosomal protein S19e ; ligands: MET,MG ; ELECTRON MICROSCOPY
e7zaiU1[U:2-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
30S ribosomal protein S19e ; ligands: MET,MG ; ELECTRON MICROSCOPY
e7zhgU1[U:2-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
30S ribosomal protein S19e ; ligands: MG ; ELECTRON MICROSCOPY
e7qiyK1[K:3-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S head ribosomal protein eS19 ; ligands: K ; ELECTRON MICROSCOPY
e7qizUA1[UA:3-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein eS19 ; ligands: K ; ELECTRON MICROSCOPY
e7tqlU1[U:4-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7oyaT21[T2:7-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7oybT21[T2:7-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7oycT21[T2:7-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7mpiBT1[BT:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ligands: MG ; ELECTRON MICROSCOPY
e7mpjBT1[BT:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ligands: MG ; ELECTRON MICROSCOPY
e7n8bBT1[BT:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e7pzyU1[U:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal 40S subunit protein S19A ; ligands: MG ; ELECTRON MICROSCOPY
e7q08U1[U:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal 40S subunit protein S19A ; ELECTRON MICROSCOPY
e7q0fU1[U:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal 40S subunit protein S19A ; ELECTRON MICROSCOPY
e7q0pU1[U:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal 40S subunit protein S19A ; ELECTRON MICROSCOPY
e7q0rU1[U:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal 40S subunit protein S19A ; ELECTRON MICROSCOPY
e7zjxSe1[Se:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S Ribosomal protein eS19 ; ELECTRON MICROSCOPY
e7qp6d1[d:3-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MG ; ELECTRON MICROSCOPY
e7qp7d1[d:3-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7pwfT1[T:3-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein S19e ; ELECTRON MICROSCOPY
e7pwoT11[T1:3-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein S19e ; ELECTRON MICROSCOPY
e7sygU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH
eS19 ; ELECTRON MICROSCOPY
e7syhU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH
eS19 ; ELECTRON MICROSCOPY
e7syiU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7syjU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7sykU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7sylU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7symU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH
eS19 ; ELECTRON MICROSCOPY
e7synU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH
eS19 ; ELECTRON MICROSCOPY
e7syoU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7sypU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7syqU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7syrU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7sysU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7sytU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7syuU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7syvU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7sywU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7syxU1[U:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7toqAS191[AS19:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7torAS191[AS19:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ELECTRON MICROSCOPY
e7ucjTT1[TT:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MG ; ELECTRON MICROSCOPY
e7uckTT1[TT:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MG ; ELECTRON MICROSCOPY
e7oydTT1[TT:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7zw0sI1[sI:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e7qvpRT1[RT:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7qvpST1[ST:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7zpqAT1[AT:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e7zrsAT1[AT:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e7zuwAT1[AT:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e7zuxDT1[DT:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e8c00I1[I:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e8c01I1[I:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e7r4xT1[T:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: K,MG ; ELECTRON MICROSCOPY
e7wttT1[T:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7wtuT1[T:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7wtvT1[T:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7wtwT1[T:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7wtxT1[T:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7wtzT1[T:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7wu0T1[T:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e7zjwSe1[Se:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S Ribosomal protein eS19 ; ELECTRON MICROSCOPY
e7qcaST01[ST0:2-143] Image Pymol Jmol Links: PDB, SCOP, CATH
40S Ribosomal protein S19 ; ELECTRON MICROSCOPY
e7qjhST01[ST0:2-143] Image Pymol Jmol Links: PDB, SCOP, CATH
e7qjhRT01[RT0:2-143] Image Pymol Jmol Links: PDB, SCOP, CATH
e7qggST1[ST:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ELECTRON MICROSCOPY
e8bqdI1[I:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e8bqxI1[I:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e8cahJ1[J:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ligands: MG ; ELECTRON MICROSCOPY
e8casK1[K:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e8cbjT1[T:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e7z3nST1[ST:3-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-like protein ; ELECTRON MICROSCOPY
e7z3oST1[ST:3-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-like protein ; ELECTRON MICROSCOPY
e8btkAs1[As:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MG,SPD ; ELECTRON MICROSCOPY
e8g5yST1[ST:2-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MET,MG ; ELECTRON MICROSCOPY
e8g5zST1[ST:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MET,MG,PHE ; ELECTRON MICROSCOPY
e8g60ST1[ST:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 ; ligands: MET,MG,PHE ; ELECTRON MICROSCOPY
e8g61ST1[ST:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MET,MG ; ELECTRON MICROSCOPY
e8g6jST1[ST:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MET,MG,PHE ; ELECTRON MICROSCOPY
e8glpST1[ST:2-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MET,MG ; ELECTRON MICROSCOPY
e7xnxST1[ST:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MG ; ELECTRON MICROSCOPY
e7xnyST1[ST:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MG ; ELECTRON MICROSCOPY
e8br3ST01[ST0:2-143] Image Pymol Jmol Links: PDB, SCOP, CATH
e8br8SW1[SW:2-138] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein S19e ; ELECTRON MICROSCOPY
e8brmSW1[SW:2-138] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein S19e ; ELECTRON MICROSCOPY
e8bsiSW1[SW:2-139] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein S19e ; ELECTRON MICROSCOPY
e8bsjSW1[SW:2-139] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein S19e ; ELECTRON MICROSCOPY
e8btdSW1[SW:2-139] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein S19e ; ELECTRON MICROSCOPY
e8btrSW1[SW:2-139] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Ribosomal protein S19e ; ELECTRON MICROSCOPY
e8hkxS19E1[S19E:2-151] Image Pymol Jmol Links: PDB, SCOP, CATH
; ELECTRON MICROSCOPY
e8hkyS19E1[S19E:2-151] Image Pymol Jmol Links: PDB, SCOP, CATH
; ELECTRON MICROSCOPY
e8hl2S19E1[S19E:2-151] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
30S ribosomal protein S19e ; ELECTRON MICROSCOPY
e8hl5S19E1[S19E:2-151] Image Pymol Jmol Links: PDB, SCOP, CATH
; ELECTRON MICROSCOPY
e8eubBT1[BT:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8q5iU1[U:2-142] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
; ELECTRON MICROSCOPY
e8ccsv1[v:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-A ; ELECTRON MICROSCOPY
e8auvE1[E:5-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eS19 (40S ribosomal protein S19) ; ELECTRON MICROSCOPY
e8b2lE11[E1:5-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19-3 ; ELECTRON MICROSCOPY
e8p2kAs1[As:2-144] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
40S ribosomal protein S19 ; ligands: MG,SPD,UNX ; ELECTRON MICROSCOPY
e8t4sT1[T:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8ppkT1[T:2-145] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Small ribosomal subunit protein eS19 ; ligands: MG ; ELECTRON MICROSCOPY
e8bhfU31[U3:3-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ligands: MG ; ELECTRON MICROSCOPY
e8p5dST01[ST0:2-143] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; ELECTRON MICROSCOPY
e8a98SX1[SX:35-173] Image Pymol Jmol Links: PDB, SCOP, CATH
40S ribosomal protein S19-like protein ; ELECTRON MICROSCOPY
PreviousPseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
lacks the N-terminal helix, circularly permuted wing
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
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