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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative


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Evolutionary classification of protein domain structures

alpha arraysalpha-helix arrays with mainly perpendicular helices

X: HTH
H: HTH
T: winged
F: Ribosomal_S19e

PF01090 CL0123

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

Previous
F: Unmapped domains

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.

T: DNA-binding domain of intron-encoded endonucleases

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